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Khan W, Kushwaha AK, Al-Amer R, Alanazi N, Alqahtani HR, Al-Qaisi S, Faizan M, Haq BU, Laref A, Alghamdi EA, Nya FT, Amine Monir ME, Chowdhury S. Electronic, optical, and thermoelectric characteristics of (Ae) xFBiS 2 (Ae=Sr, Ba, and x=1.7) layered materials useful in optical modulator devices. J Mol Graph Model 2024; 129:108729. [PMID: 38479238 DOI: 10.1016/j.jmgm.2024.108729] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2023] [Revised: 02/04/2024] [Accepted: 02/14/2024] [Indexed: 04/15/2024]
Abstract
The recent discovery of superconductivity behavior in the mother BiS2-layered compounds has captivated the attention of several physicists. The crystal structure of superconductors with alternate layers of BiS2 is homologous to that of cuprates and Fe-based superconductors. The full-potential linearized augmented plane-wave (FP-LAPW) technique was utilized to investigate the electronic structures and density of states in the vicinity of the Fermi energy of SrFBiS2 and BaFBiS2 compounds under the electron carriers doping. The introduction of electron doping (carries doping) reveals that the host compounds SrFBiS2 and BaFBiS2 exhibit features indicative of superconductivity. This carrier doping of SrFBiS2 and BaFBiS2 compounds (electron-doped) has a significant impact on the lowest conduction states near the Fermi level for the emergence of the superconducting aspect. The electron doping modifies and induces changes in the electronic structures with superconducting behavior in (Ae)1.7FBiS2(Ae=Sr,Ba) compounds. A Fermi surface nesting occurred under the modification of electrons (carriers) doping in the host compounds SrFBiS2 and BaFBiS2. Furthermore, the optical characteristics of the carrier-doped SrFBiS2 and BaFBiS2 compounds are simulated. Due to the anisotropic behavior, the optical properties of these materials based on BiS2 demonstrate a pronounced polarization dependency. The starting point at zero photon energy in the infrared region is elucidated by considering the Drude features in the optical conductivity spectra of SrFBiS2 and BaFBiS2 compounds, when the electron carriers doping is applied. It was clearly noticed that the spin-orbit coupling (SOC) influences the electronic band structures, density of states, Femi surface, and optical features because of the heavy Bismuth atom, which may disclose fascinating aspects. Further, we conducted simulations to assess the thermoelectric properties of these mother compounds. The two BiS2-layered compounds could be suitable for practical thermoelectric purposes and are highlighted through assessment of electrical conductivity, thermal conductivity, Seebeck coefficient, and power factor. As a result, we propose that the mechanisms of superconducting behavior in BiS2 family may pave new avenues for investigating the field of unconventional superconductivity. It may also provide new insights into the origin of high-Tc superconductivity nature.
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Affiliation(s)
- W Khan
- Department of Physics, Bacha Khan University, Charsada, Pakistan.
| | - A K Kushwaha
- Department of Physics, S.I.G. Govt. P.G. College, Lalganj, Mirzapur, U.P., India; Department of Physics, K.N. Govt. P.G. College, Gyanpur, Bhadohi, 221304, U.P., India
| | - R Al-Amer
- Department of Physics and Astronomy, College of Science, King Saud University, Riyadh, 11451, Kingdom of Saudi Arabia
| | - Nadyah Alanazi
- Department of Physics and Astronomy, College of Science, King Saud University, Riyadh, 11451, Kingdom of Saudi Arabia
| | - H R Alqahtani
- Department of Physics and Astronomy, College of Science, King Saud University, Riyadh, 11451, Kingdom of Saudi Arabia
| | - Samah Al-Qaisi
- Palestinian Ministry of Education and Higher Education, Nablus, Palestine
| | - Muhammad Faizan
- College of Materials Science and Engineering Jilin University, Changchun, China
| | - Bakhtiar Ul Haq
- Faculty of Science Education, Jeju National University, Jeju, 63243, Republic of Korea; Advanced Functional Materials & Optoelectronics Laboratory (AFMOL), Department of Physics, Faculty of Science, King Khalid University, P.O. Box 9004, Abha, Kingdom of Saudi Arabia
| | - A Laref
- Department of Physics and Astronomy, College of Science, King Saud University, Riyadh, 11451, Kingdom of Saudi Arabia.
| | - Eman A Alghamdi
- Department of Physics and Astronomy, College of Science, King Saud University, Riyadh, 11451, Kingdom of Saudi Arabia
| | - Fridolin Tchangnwa Nya
- University of Maroua, High National College of Technology, Department of Energy and Environment, Cameroon; University of Maroua, Faculty of Science, Department of Physics, Materials Science Laboratory, P.O. Box 814, Maroua, Cameroon
| | - Mohammed El Amine Monir
- Faculty of the Exact Sciences, Mustapha Stambouli University of Mascara, B.P. 305, 29000, Mascara, Algeria
| | - Shahariar Chowdhury
- Faculty of Environmental Management, Prince of Songkla University, Songkhla, 90110, Thailand; Environmental Assessment and Technology for Hazardous Waste Management Research Centre, Faculty of Environmental Management, Prince of Songkla University, Songkhla, 90110, Thailand
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Celestine L, Zosiamliana R, Kima L, Chettri B, Singh YT, Gururng S, Singh NS, Laref A, Rai DP. Hybrid-DFT study of halide perovskites, an energy-efficient material undercompressive pressure for piezoelectric applications. J Phys Condens Matter 2024. [PMID: 38670125 DOI: 10.1088/1361-648x/ad443e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/28/2024]
Abstract
Recent studies have reported that lead-halide perovskites are the most efficient energy-harvesting materials. Regardless of their high-output energy and structural stability, lead-based products have risk factors due to their toxicity. Therefore, lead-free perovskites that offer green energy are the expected alternatives. We have taken CsGeX3(X= Cl, Br, and I) as lead-free halide perovskites
despite knowing the low power conversion rate. Herein, we have tried to study the mechanisms of enhancement of energy-harvesting capabilities involving an interplay between structure and electronic properties. A density functional theory (DFT) simulation of these materials shows a decrease in the band gaps, lattice parameters, and volumes with increasing applied pressure. We report the
high piezoelectric responses and high electro-mechanical conversion rates, which are intriguing for generating electricity through mechanical stress.
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Affiliation(s)
- L Celestine
- Mizoram University Pachhunga University College, Aizawl, Aizawl, --- Select One ---, 796001, INDIA
| | - R Zosiamliana
- Pachhunga University College, aizawl, Aizawl, Mizoram, 796001, INDIA
| | - Lalrin Kima
- Mizoram University, Department of Physics, School of Physical Sciences, Mizoram University, Aizawl -796004, Mizoram, India, Aizawl, Mizoram, 796004, INDIA
| | | | - Y T Singh
- North-Eastern Hill University, Shillong, Shillong, Meghalaya, 793022, INDIA
| | - Shivraj Gururng
- Mizoram University Pachhunga University College, Aizawl, Aizawl, --- Select One ---, 796001, INDIA
| | | | - A Laref
- Department of Physics , King Saud University, Riyadh, Riyadh, Riyadh, 11362, SAUDI ARABIA
| | - D P Rai
- Physics, Mizoram University Pachhunga University College, Aizawl, Aizawl, --- Select One ---, 796001, INDIA
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Ul Haq B, Kim SH, Chaudhry AR, AlFaify S, Butt FK, Tahir SA, Ahmed R, Laref A. Effect of Surface Termination with Oxygen and Fluorine on the Electronic Structures and optical spectra of Mn2N Based MXenes. Chemphyschem 2024:e202300605. [PMID: 38517984 DOI: 10.1002/cphc.202300605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2023] [Revised: 03/13/2024] [Accepted: 03/22/2024] [Indexed: 03/24/2024]
Abstract
The extensive applications of MXenes, a novel type of layered materials known for their favorable characteristics, have sparked significant interest. This research focuses on investigating the impact of surface functionalization on the behavior of Mn2NX2 (X = O, F) MXenes monolayers using the "Density functional theory (DFT) based full-potential linearized augmented-plane-wave (FP-LAPW)" method. We observe and elucidate the variations in the physical properties of the Mn2NX2 by employing different surface terminations with F and O functional groups. We found that O-termination results in half-metallic behavior, whereas the N-termination evolves metallic characteristics within these MXene systems. Similarly, surface termination has effectively influenced their optical absorption efficiency. For instance, Mn2NO2 and Mn2NF2 effectively absorb UV light of magnitude 50.15×104 cm-1 and 37.71×104 cm-1, respectively. Additionally, they demonstrated prominent refraction and reflection characteristics, comprehensively discussed in the present work. Our predictions offer valuable perspectives into the optical and electronic characteristics of Mn2NX2-based MXenes, presenting the promising potential for implementing them in diverse optoelectronic devices.
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Affiliation(s)
- Bakhtiar Ul Haq
- Jeju National University, Physics Education, KOREA, REPUBLIC OF
| | - Se-Hun Kim
- Jeju National University, 102 Jejudaehakno, Jeju Physics Education, College of Education, Jeju National University, 63243, Jeju, KOREA, REPUBLIC OF
| | | | - S AlFaify
- King Khalid University, Physics, SAUDI ARABIA
| | | | - S A Tahir
- University of the Punjab, Physics, PAKISTAN
| | - R Ahmed
- University of Technology Malaysia, Physics, MALAYSIA
| | - A Laref
- King Saud University, Department of Physics and Astronomy, SAUDI ARABIA
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Alburaih HA, Nazir S, Noor NA, Laref A, Saad H-E MM. Physical properties of vacancy-ordered double perovskites K 2TcZ 6 (Z = Cl, Br) for spintronics applications: DFT calculations. RSC Adv 2024; 14:1822-1832. [PMID: 38192306 PMCID: PMC10772539 DOI: 10.1039/d3ra07603b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2023] [Accepted: 12/27/2023] [Indexed: 01/10/2024] Open
Abstract
Vacancy-ordered double perovskites (DPs) are emerging materials for spintronics due to their stable structures and non-toxic properties. In this study, we conducted a comprehensive investigation into the role of 4d electrons in Tc to understand their impact on the ferromagnetic properties of K2TcY6 (Y = Cl, Br). We have employed a modified Back and Johnson potential to assess electronic and magnetic characteristics and utilized the BoltzTraP code to investigate thermoelectric effects. Experimental lattice constants confirmed the presence of stable structures and formation energy estimates affirmed their thermodynamic stability. The Heisenberg model and density of electron states (DOS) at the Fermi level provides insights into Curie temperature and spin polarization. The presence of ferromagnetism is evident in the density of states, reflecting the transition of electron spins that support the exchange mechanism. The study delves into how electron functionality influences the control of ferromagnetism, considering exchange constants, exchange energies, hybridization process and the crystal field energies. Moreover, the exploitation of magnetic moments from Tc to K and Cl/Br sites takes precedence in driving ferromagnetism by exchanging electron spins rather than forming magnetic clusters. Additionally, to explore the optical characteristics of the compounds, we investigated their optical absorption, dielectric constants and refractive index within the energy range of 0-10 eV, ensuring absorption across both the visible and ultraviolet regions. Finally, we delve into the impact of the thermoelectric effect on both thermoelectric performance and spin functionality, taking into account factors such as the Seebeck coefficient, power factor, and electronic conductivity.
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Affiliation(s)
- Huda A Alburaih
- Physics Department, College of Science, Princess Nourah Bint Abdulrahman University 11671 Riyadh 12211 Saudi Arabia
| | - Sadia Nazir
- Department of Physics, University of Lahore Pakistan
| | - N A Noor
- Department of Physics, RIPHAH International University, Campus Lahore Pakistan
| | - A Laref
- Department of Physics and Astronomy, College of Science, King Saud University Riyadh 11451 King Saudi Arabia
| | - M Musa Saad H-E
- Department of Physics, College of Science and Arts in Al-Muthnib, Qassim University Al-Muthnib 51931 Saudi Arabia
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Zanib M, Manzoor M, Noor N, Iqbal MW, Asghar M, Hegazy H, Laref A. DFT investigation of half-metallic ferromagnetic rare earth based spinels MgHo2Z4 (Z = S, se). J RARE EARTH 2023. [DOI: 10.1016/j.jre.2023.02.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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6
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Alam Q, Sardar S, Din HU, Khan SA, Idrees M, Amin B, Rehman F, Muhammad S, Laref A. A first principles study of a van der Waals heterostructure based on MS 2 (M = Mo, W) and Janus CrSSe monolayers. Nanoscale Adv 2022; 4:3557-3565. [PMID: 36134356 PMCID: PMC9400489 DOI: 10.1039/d2na00298a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Accepted: 07/02/2022] [Indexed: 06/16/2023]
Abstract
The strategy of stacking two-dimensional materials for designing van der Waals heterostructures has gained tremendous attention in realizing innovative device applications in optoelectronics and renewable energy sources. Here, we performed the first principles calculations of the geometry, optoelectronic and photocatalytic performance of MS2-CrSSe (M = Mo, W) vdW heterostructures. The mirror asymmetry in the Janus CrSSe system allows the designing of two models of the MS2-CrSSe system by replacing S/Se atoms at opposite surfaces in CrSSe. The feasible configurations of both models of the MS2-CrSSe system are found energetically, dynamically and thermally stable. The studied heterobilayers possess an indirect type-I band alignment, indicating that the recombination of photogenerated electrons and holes in the CrSSe monolayer is hence crucial for photodetectors and laser applications. Remarkably, a red-shift in the optical absorption spectra of MS2-CrSSe makes them potential candidates for light harvesting applications. More interestingly, all heterobilayers (except W(Mo)S2-CrSSe of model-I(II)) reveal appropriate band edge positions of the oxidation and reduction potentials of the photocatalysis of water dissociation into H+/H2 and O2/H2O at pH = 0. These results shed light on the practical design of the MS2-CrSSe system for efficient optoelectronic and photocatalytic water splitting applications.
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Affiliation(s)
- Q Alam
- Department of Physics, Hazara University Mansehra KP Pakistan
| | - S Sardar
- Department of Physics, Hazara University Mansehra KP Pakistan
| | - H U Din
- Department of Physics, Bacha Khan University Charsadda KP Pakistan
| | - S A Khan
- Department of Physics, Hazara University Mansehra KP Pakistan
| | - M Idrees
- Department of Physics, Abbottabad University of Science & Technology Havelian Abbottabad KP Pakistan
| | - B Amin
- Department of Physics, Abbottabad University of Science & Technology Havelian Abbottabad KP Pakistan
| | - F Rehman
- Department of Physics, Khushal Khan Khattak University Karak KP Pakistan
| | - Saleh Muhammad
- Department of Physics, Hazara University Mansehra KP Pakistan
| | - A Laref
- Department of Physics and Astronomy, College of Science, King Saud University Riyadh 11451 Saudi Arabia
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Ahmad S, Shahid I, Shehzad N, Khan W, Din HU, Idrees M, Amin B, Laref A. First principles study of optoelectronic and photocatalytic performance of novel transition metal dipnictide XP 2 (X = Ti, Zr, Hf) monolayers. RSC Adv 2022; 12:11202-11206. [PMID: 35425062 PMCID: PMC8996753 DOI: 10.1039/d2ra01851a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Accepted: 04/01/2022] [Indexed: 11/21/2022] Open
Abstract
Low cost and highly efficient two dimensional materials as photocatalysts are gaining much attention to utilize solar energy for water splitting and produce hydrogen fuel as an alternative to deal with the energy crisis and reduce environmental hazards. First principles calculations are performed to investigate the electronic, optical and photocatalytic properties of novel two dimensional transition metal dipnictide XP2 (X = Ti, Zr, Hf) monolayers. The studied single layer XP2 is found to be dynamically and thermally stable. TiP2, ZrP2 and HfP2 systems exhibit semiconducting nature with moderate indirect band gap values of 1.72 eV, 1.43 eV and 2.02 eV, respectively. The solar light absorption is found to be in energy range of 1.65–3.3 eV. All three XP2 systems (at pH = 7) and the HfP2 monolayer (at pH = 0) that straddle the redox potentials, are promising candidates for the water splitting reaction. These findings enrich the two dimensional family and provide a platform to design novel devices for emerging optoelectronic and photovoltaic applications. Low cost and highly efficient two dimensional materials as photocatalysts are gaining much attention to utilize solar energy for water splitting and produce hydrogen fuel as an alternative to deal with the energy crisis and reduce environmental hazards.![]()
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Affiliation(s)
- Sheraz Ahmad
- School of Materials Science and Engineering, Computational Centre for Molecular Science, Institute of New Energy Material Chemistry, Nankai University Tianjin 300350 P. R. China
| | - Ismail Shahid
- School of Materials Science and Engineering, Computational Centre for Molecular Science, Institute of New Energy Material Chemistry, Nankai University Tianjin 300350 P. R. China
| | - Nasir Shehzad
- School of Physics, Nankai University Tianjin 300071 P. R. China
| | - W Khan
- Department of Physics, Bacha Khan University Charsadda KP Pakistan
| | - H U Din
- Department of Physics, Bacha Khan University Charsadda KP Pakistan
| | - M Idrees
- Department of Physics, Abbottabad University of Science & Technology Havelian Abbottabad KP Pakistan
| | - B Amin
- Department of Physics, Abbottabad University of Science & Technology Havelian Abbottabad KP Pakistan
| | - A Laref
- Department of Physics and Astronomy, College of Science, King Saud University Riyadh 11451 Saudi Arabia
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Yu Q, Huang H, Xue S, Tong R, Laref A, Chen J, He Z, Zhu Z, Luo S. Structural configuration and phase stability in the quaternary Heusler compounds CoCrYSb (Y=Sc,Ti, V). COMPUT THEOR CHEM 2022. [DOI: 10.1016/j.comptc.2022.113656] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Rashid M, Aziz F, Mahmood Q, Kattan NA, Laref A. Pressure-Induced Modifications in the Optoelectronic and Thermoelectric Properties of MgHfO3 for Renewable Energy Applications. Arab J Sci Eng 2022. [DOI: 10.1007/s13369-021-05378-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Alanazi RS, Laref A. Monte Carlo simulations of photodynamic therapy in human blood model. Lasers Med Sci 2021; 37:1515-1529. [PMID: 34453656 DOI: 10.1007/s10103-021-03383-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Accepted: 07/19/2021] [Indexed: 11/26/2022]
Abstract
This study aims to simulate a therapeutic plan for a normal human blood model under various patho-physiological conditions, such as the development of leukemia/blood diseases, by means of Monte Carlo multilayered simulation. The photosensitizing compound selectively accumulates in the target cells. A superficial treatment of a blood sample was performed at different ratios of oxygen saturation ([Formula: see text]) under the concentration ([Formula: see text] = 30 µM) effect of merocyanine 540 (MC540) in the blood irradiation. This was done under the application of visible light of wavelength ~ [Formula: see text] at an exposure time ~ 60 s. The dose of photodynamic therapy (PDT) was evaluated for the biological damage, leading to necrosis and blood damage during the treatment. In addition, the effect of PDT treatment response in the blood is related to hemoglobin oxygen saturation, resulting in an excellent relationship between the changes caused by the treatment in the blood at a peculiar oxygen saturation rate (for the highest response: [Formula: see text] 50%) and a light dose (LD) of 3.83 [Formula: see text] above the minimal toxicity of normal tissues. The photodynamic dose is related to the depth of necrosis and the time of treatment for the achievement of the LD delivery at the PDT of blood.
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Affiliation(s)
- R S Alanazi
- Department of Physics and Astronomy, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia
- Department of Biomedical Technology, College of Applied Medical Sciences, King Saud University, P.O. Box 10219, Riyadh, Saudi Arabia
| | - A Laref
- Department of Physics and Astronomy, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia.
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Joshi H, Ram M, Limbu N, Rai DP, Thapa B, Labar K, Laref A, Thapa RK, Shankar A. Author Correction: Modulation of optical absorption in m-Fe 1-xRu xS 2 and exploring stability in new m-RuS 2. Sci Rep 2021; 11:16022. [PMID: 34341477 PMCID: PMC8329053 DOI: 10.1038/s41598-021-95557-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Affiliation(s)
- H Joshi
- Condensed Matter Theory Research Lab, Kurseong College, Darjeeling, 734203, India. .,Department of Physics, St. Josephs College, North Point, Darjeeling, 734103, India.
| | - M Ram
- Condensed Matter Theory Research Lab, Kurseong College, Darjeeling, 734203, India
| | - N Limbu
- Condensed Matter Theory Research Lab, Kurseong College, Darjeeling, 734203, India
| | - D P Rai
- Physical Science Research Centre, Pachhunga University College, Aizawl, Mizoram, 796001, India
| | - B Thapa
- Condensed Matter Theory Research Lab, Kurseong College, Darjeeling, 734203, India
| | - K Labar
- Condensed Matter Theory Research Lab, Kurseong College, Darjeeling, 734203, India
| | - A Laref
- Physics Department, Faculty of Science, King Saudi University, Riyad, Saudi Arabia
| | - R K Thapa
- Department of Physics, Mizoram University, Aizawl, 796009, India
| | - A Shankar
- Condensed Matter Theory Research Lab, Kurseong College, Darjeeling, 734203, India.
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Saeed M, Qayyum A, Azam S, Akbar J, Irfan M, Ul Haq B, Muhammad S, Ullah S, Laref A. Structural, electronic, optical and thermodynamical properties of Cu3Se2 and [Cu3Se2]:Zn compounds: Using DFT. J SOLID STATE CHEM 2021. [DOI: 10.1016/j.jssc.2021.122125] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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13
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Murtaza G, Alshahrani T, Khalil RA, Mahmood Q, Flemban TH, Althib H, Laref A. Lead Free Double Perovsites Halides X2AgTlCl6 (X = Rb, Cs) for solar cells and renewable energy applications. J SOLID STATE CHEM 2021. [DOI: 10.1016/j.jssc.2021.121988] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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14
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Qamar MA, Shahid S, Javed M, Iqbal S, Sher M, Bahadur A, AL-Anazy MM, Laref A, Li D. Designing of highly active g-C3N4/Ni-ZnO photocatalyst nanocomposite for the disinfection and degradation of the organic dye under sunlight radiations. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.126176] [Citation(s) in RCA: 40] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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15
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Joshi H, Ram M, Limbu N, Rai DP, Thapa B, Labar K, Laref A, Thapa RK, Shankar A. Modulation of optical absorption in m-Fe 1-xRu xS 2 and exploring stability in new m-RuS 2. Sci Rep 2021; 11:6601. [PMID: 33758358 PMCID: PMC7987963 DOI: 10.1038/s41598-021-86181-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Accepted: 03/08/2021] [Indexed: 12/03/2022] Open
Abstract
A first-principle computational method has been used to investigate the effects of Ru dopants on the electronic and optical absorption properties of marcasite FeS2. In addition, we have also revealed a new marcasite phase in RuS2, unlike most studied pyrite structures. The new phase has fulfilled all the necessary criteria of structural stability and its practical existence. The transition pressure of 8 GPa drives the structural change from pyrite to orthorhombic phase in RuS2. From the thermodynamical calculation, we have reported the stability of new-phase under various ranges of applied pressure and temperature. Further, from the results of phonon dispersion calculated at Zero Point Energy, pyrite structure exhibits ground state stability and the marcasite phase has all modes of frequencies positive. The newly proposed phase is a semiconductor with a band gap comparable to its pyrite counterpart but vary in optical absorption by around 106 cm-1. The various Ru doped structures have also shown similar optical absorption spectra in the same order of magnitude. We have used crystal field theory to explain high optical absorption which is due to the involvement of different electronic states in formation of electronic and optical band gaps. Lӧwdin charge analysis is used over the customarily Mulliken charges to predict 89% of covalence in the compound. Our results indicate the importance of new phase to enhance the efficiency of photovoltaic materials for practical applications.
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Affiliation(s)
- H Joshi
- Condensed Matter Theory Research Lab, Kurseong College, Darjeeling, 734203, India.
- Department of Physics, St. Josephs College, North Point, Darjeeling, 734103, India.
| | - M Ram
- Condensed Matter Theory Research Lab, Kurseong College, Darjeeling, 734203, India
| | - N Limbu
- Condensed Matter Theory Research Lab, Kurseong College, Darjeeling, 734203, India
| | - D P Rai
- Physical Science Research Centre, Pachhunga University College, Aizawl, Mizoram, 796001, India
| | - B Thapa
- Condensed Matter Theory Research Lab, Kurseong College, Darjeeling, 734203, India
| | - K Labar
- Condensed Matter Theory Research Lab, Kurseong College, Darjeeling, 734203, India
| | - A Laref
- Physics Department, Faculty of Science, King Saudi University, Riyad, Saudi Arabia
| | - R K Thapa
- Department of Physics, Mizoram University, Aizawl, 796009, India
| | - A Shankar
- Condensed Matter Theory Research Lab, Kurseong College, Darjeeling, 734203, India.
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Hendi A, Alkhraif R, Alshehri H, AlKallas F, Almoneef M, Laref A, Awad M, Alsaif N, Almuqrin AH, Alanazi M, Altowyan A, Ortashi K. Photovoltaic Performance of Thin-Film CdTe for Solar Cell Applications. j nanofluids 2021. [DOI: 10.1166/jon.2021.1763] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
In the current investigation, we report a theoretical study to acquire the highest feasible efficiency of cadmium telluride (CdTe) thin-films. It is well recognized that CdTe crystallizes in cubic zinc-blende structure and its direct band gap of 1.5 eV turned it out as a potential candidate
for photovoltaic (PV) applications. Our calculations are founded on Shockley-Queisser (SQ) limit to simulate the open-circuit voltage, current density, and filling factor versus the variation of photon energy up to 4.0 eV. These key parameters of SQ change with the variation of energy between
0.3 to 3.5 eV. This is owing to the strong optical absorption (> 104 cm−1) and direct band gap of 1.5 eV, which make CdTe thin-film suitable for single junction solar cell and ideal for PV applications. It is observed that the optical absorption enhances as the
thickness of the absorbed layer increases. This will effectively provide a theoretical support to the industry of global solar energy that is anticipated to be sustainable in the future.
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Affiliation(s)
- A. Hendi
- Department of Physics, College of Science, Princess Nourah bint Abdulrahman University, Riyadh, 11671, Saudi Arabia
| | - R. Alkhraif
- Department of Physics, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia
| | - H. Alshehri
- Department of Physics, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia
| | - F. AlKallas
- Department of Physics, College of Science, Princess Nourah bint Abdulrahman University, Riyadh, 11671, Saudi Arabia
| | - M. Almoneef
- Department of Physics, College of Science, Princess Nourah bint Abdulrahman University, Riyadh, 11671, Saudi Arabia
| | - A. Laref
- Department of Physics, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia
| | - M. Awad
- King Abdullah Institute of Nanotechnology, King Saud University, Riyadh, 11451, Saudi Arabia
| | - N. Alsaif
- Department of Physics, College of Science, Princess Nourah bint Abdulrahman University, Riyadh, 11671, Saudi Arabia
| | - Aljawhara H. Almuqrin
- Department of Physics, College of Science, Princess Nourah bint Abdulrahman University, Riyadh, 11671, Saudi Arabia
| | - M. Alanazi
- Department of Physics, College of Science, Princess Nourah bint Abdulrahman University, Riyadh, 11671, Saudi Arabia
| | - A. Altowyan
- Department of Physics, College of Science, Princess Nourah bint Abdulrahman University, Riyadh, 11671, Saudi Arabia
| | - K. Ortashi
- Department of Chemical Engineering, College of Engineering, King Saud University, Riyadh, 11451, Saudi Arabia
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Tabassam S, Reshak AH, Murtaza G, Muhammad S, Laref A, Yousaf M, Al Bakri AM, Bila J. Co 2YZ (Y= Cr, Nb, Ta, V and Z= Al, Ga) Heusler alloys under the effect of pressure and strain. J Mol Graph Model 2021; 104:107841. [PMID: 33529935 DOI: 10.1016/j.jmgm.2021.107841] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2020] [Revised: 12/27/2020] [Accepted: 01/07/2021] [Indexed: 11/17/2022]
Abstract
Full Heuslers alloys are a fascinating class of materials leading to many technological applications. These have been studied widely under ambient conditions. However, less attention been paid to study them under the effect of compression and strain. Here in this work Co2YZ (Y= Cr, Nb, Ta, V and Z = Al, Ga) Heusler alloys have been studied comprehensively under pressure variations. Calculated lattice constants are in reasonable agreement with the available data. It is determined that lattice constant deceases with the increase in tensile stress and increases by increasing pressure in reverse direction. Band profiles reveals the half metallic nature of the studied compounds. The bond length decreases while band gap increases in compressive strain. The compounds are found to be reflective in visible region, as characteristics of the metals. The magnetic moments reveal the half-mettalic ferromagnetic nature of the compounds.
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Affiliation(s)
- Sadia Tabassam
- Materials Modeling Lab, Department of Physics, Hazara University, Mansehra, P. O. Box 21120, Pakistan
| | - Ali H Reshak
- Physics Department, College of Science, University of Basrah, Basrah, Iraq; Department of Instrumentation and Control Engineering, Faculty of Mechanical Engineering, CTU in Prague, Technicka 4, Prague, 6 166 07, Czech Republic; Center of Excellence Geopolymer and Green Technology, School of Material Engineering, University Malaysia Perlis, 01007, Kangar, Perlis, Malaysia.
| | - G Murtaza
- Materials Modeling Lab, Department of Physics, Islamia College Peshawar, P.O. Box 25120, Pakistan; Department of Mathematics & Natural Sciences, Prince Mohammad Bin Fahd University, P. O. Box 1664, Alkhobar, 31952, Saudi Arabia
| | - S Muhammad
- Materials Modeling Lab, Department of Physics, Hazara University, Mansehra, P. O. Box 21120, Pakistan
| | - A Laref
- Department of Physics, College of Science, Imam Abdulrahman Bin Faisal University, P.O. Box 1982, 31441, City Dammam, Saudi Arabia
| | - Masood Yousaf
- Department of Physics, University of Education, Lahore, Pakistan
| | - Am Mustafa Al Bakri
- Center of Excellence Geopolymer and Green Technology, School of Material Engineering, University Malaysia Perlis, 01007, Kangar, Perlis, Malaysia
| | - J Bila
- Department of Instrumentation and Control Engineering, Faculty of Mechanical Engineering, CTU in Prague, Technicka 4, Prague, 6 166 07, Czech Republic
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Shah SH, Khan S, Murtaza G, Amir Ali M, Laref A, Algrafy E, Ahmadini AAH. Anion replacement effect on BaCd2X2 (X = P, As, Sb, Bi) compounds: A first principles study. J SOLID STATE CHEM 2020. [DOI: 10.1016/j.jssc.2020.121589] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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19
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Junaid M, Khan MA, Hashmi ZM, Nasar G, Kattan NA, Laref A. Structural, spectral, magnetic and dielectric properties of Bi substituted Li-Co spinel ferrites. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2020.128859] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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20
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Mahmood Q, Ul Haq B, Rashid M, Noor N, AlFaify S, Laref A. First-principles study of magnetic and thermoelectric properties of SnFe2O4 and SnCo2O4 spinels. J SOLID STATE CHEM 2020. [DOI: 10.1016/j.jssc.2020.121279] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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21
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Chaudhry AR, Muhammad S, Ul Haq B, Laref A, Shaari A, Gilani MA. Exploring the opto-electronic and charge transfer nature of F-BODIPY derivatives at molecular level: A theoretical perspective. Chem Phys 2019. [DOI: 10.1016/j.chemphys.2019.110488] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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22
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Mahmood Q, Hassan M, Yaseen M, Laref A. Half-metallic ferromagnetism and optical behavior in alkaline-earth metals based Beryllium perovskites: DFT calculations. Chem Phys Lett 2019. [DOI: 10.1016/j.cplett.2019.05.011] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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23
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Mahmood Q, Rashid M, Amin B, Noor N, Laref A. Theoretical prediction of optoelectronic and thermoelectric properties of RbXO2 (X = Al, Ga, In) for renewable energy applications. Chem Phys Lett 2019. [DOI: 10.1016/j.cplett.2019.04.084] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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24
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Khandy SA, Islam I, Gupta DC, Khenata R, Laref A. Lattice dynamics, mechanical stability and electronic structure of Fe-based Heusler semiconductors. Sci Rep 2019; 9:1475. [PMID: 30728387 PMCID: PMC6365636 DOI: 10.1038/s41598-018-37740-y] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2018] [Accepted: 12/12/2018] [Indexed: 12/02/2022] Open
Abstract
The structural and mechanical stability of Fe2TaAl and Fe2TaGa alloys along with the electronic properties are explored with the help of density functional theory. On applying different approximations, the enhancement of semiconducting gap follows the trend as GGA < mBJ < GGA + U. The maximum forbidden gaps observed by GGA + U method are Eg = 1.80 eV for Fe2TaAl and 1.30 eV for Fe2TaGa. The elastic parameters are simulated to determine the strength and ductile nature of these materials. The phonon calculations determine the dynamical stability of all these materials because of the absence of any negative frequencies. Basic understandings of structural, elastic, mechanical and phonon properties of these alloys are studied first time in this report.
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Affiliation(s)
- Shakeel Ahmad Khandy
- Department of Physics, Islamic University of Science and Techonology, Awantipora, Jammu and Kashmir, 192122, India.
| | - Ishtihadah Islam
- Department of Physics, Jamia Millia Islamia New Delhi, New Delhi, 110025, India
| | - Dinesh C Gupta
- Condensed Matter Theory Group, School of Studies in Physics, Jiwaji University, Gwalior, 474011, MP, India
| | - Rabah Khenata
- Laboratoire de Physiéque Quantique, de la Matie're et de la Modélisation Mathématique (LPQ3M), Université de Mascara, Mascara, 29000, Algeria
| | - A Laref
- Department of Physics, College of Science, King Saud University, Riyadh, Saudi Arabia
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25
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Ul Haq B, AlFaify S, Laref A. Design and characterization of novel polymorphs of single-layered tin-sulfide for direction-dependent thermoelectric applications using first-principles approaches. Phys Chem Chem Phys 2019; 21:4624-4632. [DOI: 10.1039/c8cp07645f] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Advanced computational approaches have made the design and characterization of novel two-dimensional (2D) materials possible for applications in cutting-edge technologies.
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Affiliation(s)
- Bakhtiar Ul Haq
- Advanced Functional Materials & Optoelectronics Laboratory (AFMOL), Department of Physics, Faculty of Science, King Khalid University
- Abha
- Saudi Arabia
| | - S. AlFaify
- Advanced Functional Materials & Optoelectronics Laboratory (AFMOL), Department of Physics, Faculty of Science, King Khalid University
- Abha
- Saudi Arabia
| | - A. Laref
- Department of Physics and Astronomy, College of Science, King Saud University
- Riyadh
- Saudi Arabia
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26
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Laref A, Alsagri M, Alahmed ZA, Laref S. First-principles analysis for the modulation of energy band gap and optical characteristics in HgTe/CdTe superlattices. RSC Adv 2019; 9:16390-16405. [PMID: 35516368 PMCID: PMC9064394 DOI: 10.1039/c8ra10101a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2018] [Accepted: 04/24/2019] [Indexed: 11/21/2022] Open
Abstract
HgTe/CdTe superlattices (SLs), have emerged as unprecedented materials with tremendous functionalities, such as solar photocell devices. We carried out first-principles analyses in the framework of the full-potential linearized augmented plane wave (FP-LAPW) scheme to understand the impact of layer periodicity and strain on HgTe/CdTe superlattices. This technique allows us to describe the electronic and optical features of low dimensional systems, such as CdTe–HgTe heterojunctions. Alteration of the layer thickness and strain is imperative for tailoring the energy band gap of HgTe/CdTe superlattices. Thus, the CdTe and HgTe layers possess an appreciable influence on the induced forbidden gap of SLs because of their distinct quantum confinement characteristics. The electronic structures illustrate that the alteration in HgTe and CdTe layer thickness is pivotal for the overlap or non-overlap of the conduction bands and valence bands. Indeed, these systems can yield a semi-metallic or normal state with significant modification in the optical absorption of HgTe/CdTe SLs with respect to their bulk counterparts. Such SL systems have several advantageous features, involving their tailorable near band edge optical properties. Hence, it is feasible to optimize the requisite characteristics for electronic devices based on these SLs. This may enhance the development of HgTe/CdTe SLs in vast applications envisioned in infrared devices. HgTe/CdTe superlattices (SLs), have emerged as unprecedented materials with tremendous functionalities, such as solar photocell devices.![]()
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Affiliation(s)
- A. Laref
- Department of Physics and Astronomy
- College of Science
- King Saud University
- Riyadh
- 11451 King Saudi Arabia
| | - M. Alsagri
- Department of Physics and Astronomy
- College of Science
- King Saud University
- Riyadh
- 11451 King Saudi Arabia
| | - Z. A. Alahmed
- Department of Physics and Astronomy
- College of Science
- King Saud University
- Riyadh
- 11451 King Saudi Arabia
| | - S. Laref
- Fachbereich Chemie
- Philipps-Universität Marburg
- D-35032 Marburg
- Germany
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Chaudhry AR, Ul Haq B, Muhammad S, Laref A, Irfan A, Algarni H. Structural, electronic and optical properties of furan based materials at bulk level for photovoltaic applications: A first-principles study. COMPUT THEOR CHEM 2019. [DOI: 10.1016/j.comptc.2018.12.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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28
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Khan A, Sajjad M, Murtaza G, Laref A. Anion-Cation Replacement Effect on the Structural and Optoelectronic Properties of the LiMX2 (M = Al, Ga, In; X = S, Se, Te) Compounds: A First Principles Study. ACTA ACUST UNITED AC 2018. [DOI: 10.1515/zna-2018-0070] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
In the chalcopyrite (or tetragonal) phase, different physical properties of the ternary LiMX2 (M = Al, Ga, In and X = S, Se, Te) compounds are studied by the very accurate density functional method. The optimized lattice constants and the bandgaps are close to the existing experimental data. In addition, for most of the LiMX2 compounds, when the cations change from Al to In and anions from S to Te, the lattice constant and equilibrium volume for the crystal unit cell increase whereas the bulk modulus decreases. Using different generalized gradient approximations, the band structure calculations are performed. Generally, it was observed that there exists a decreasing tendency of the bandgap energies except for the LiAlSe2, LiInSe2, and LiGaTe2 compounds due to the change from Al to In as well as the change from S to Te. The bonding analysis shows that ionic bonds are present between the Li-X atoms, while a covalent bond exists between the M cations and X anions. The optical properties of the compounds are studied by calculating the real and imaginary components of the refractive index, reflectivity, optical conductivity, and birefringence. In addition, the optical properties from the calculations show that these materials are appropriate applicants to be utilized as Bragg’s reflector or applied in optoelectronic and solar cell technology.
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Affiliation(s)
- Amjad Khan
- Materials Modelling Laboratory , Department of Physics , Islamia College Peshawar , Peshawar, KP , Pakistan
| | - M. Sajjad
- Department of Physics , Kohat University of Science and Technology , Kohat, 26000, KP , Pakistan
| | - G. Murtaza
- Materials Modelling Laboratory , Department of Physics , Islamia College Peshawar , Peshawar, KP , Pakistan
| | - A. Laref
- College of Science , Department of Physics and Astronomy , King Saud University , Riyadh 11451 , Saudi Arabia
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29
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Khandy SA, Islam I, Gupta DC, Bhat MA, Ahmad S, Dar TA, Rubab S, Dhiman S, Laref A. A case study of Fe2TaZ (Z = Al, Ga, In) Heusler alloys: hunt for half-metallic behavior and thermoelectricity. RSC Adv 2018; 8:40996-41002. [PMID: 35557932 PMCID: PMC9092436 DOI: 10.1039/c8ra04433c] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2018] [Accepted: 11/08/2018] [Indexed: 11/21/2022] Open
Abstract
We have computed the electronic structure and transport properties of Fe2TaZ (Z = Al, Ga, In) alloys by the full-potential linearized augmented plane wave (FPLAPW) method. The magnetic conduct in accordance with the Slater–Pauling rule classifies them as non-magnetic alloys with total zero magnetic moment. The semiconducting band profile and the density of states in the post DFT treatment are used to estimate the relations among various transport parameters such as Seebeck coefficient, electrical conductivity, thermal conductivity, and figure of merit. The Seebeck coefficient variation and band profiles describe the p-type behavior of charge carriers. The electrical and thermal conductivity plots follow the semiconducting nature of bands along the Fermi level. The overall measurements show that semi-classical Boltzmann transport theory has well-behaved potential in predicting the transport properties of such functional materials, which may find the possibility of their experimental synthesis for future applications in thermoelectric technologies. Crystal structure in conventional unit cell for Fe2TaZ (Z = Al, Ga, In) in Fm3̄m configuration.![]()
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Affiliation(s)
| | | | - Dinesh C. Gupta
- Condensed Matter Theory Group
- School of Studies in Physics
- Jiwaji University
- Gwalior-474011
- India
| | | | - Shabir Ahmad
- Department of Physics
- Islamic University of Science and Techonology
- India
| | - Tanveer Ahmad Dar
- Department of Physics
- Islamic University of Science and Techonology
- India
| | - Seemin Rubab
- Department of Physics
- National Institute of Technology
- Srinagar-190006
- India
| | - Shobhna Dhiman
- Department of Applied Science
- Punjab Engineering College (Deemed to be University)
- Chandigarh
- India
| | - A. Laref
- Department of Physics
- College of Science
- King Saud University
- Riyadh
- Saudi Arabia
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Al-Musywel HA, Laref A. Effect of gold nanoparticles on radiation doses in tumor treatment: a Monte Carlo study. Lasers Med Sci 2017; 32:2073-2080. [DOI: 10.1007/s10103-017-2329-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2017] [Accepted: 09/15/2017] [Indexed: 11/30/2022]
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31
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Abstract
We conducted a theoretical investigation on the relative energetic and magnetic stabilities of Li–FePO4 using density functional theory combined with GGA + U.
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Affiliation(s)
- S. Laref
- Department of Materials Science and Engineering
- University of Arizona
- Tucson
- USA
- Fachbereich Chemie
| | - A. Laref
- Department of Physics and Astronomy
- College of Science
- King Saud University
- Riyadh
- 11451 King Saudi Arabia
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32
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Caliskan S, Laref A. Spin transport properties of n-polyacene molecules (n = 1-15) connected to Ni surface electrodes: theoretical analysis. Sci Rep 2014; 4:7363. [PMID: 25482076 PMCID: PMC4258687 DOI: 10.1038/srep07363] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2014] [Accepted: 11/19/2014] [Indexed: 11/13/2022] Open
Abstract
Using non-equilibrium Green function formalism in conjunction with density functional theory, we explore the spin-polarized transport characteristics of several planar n-acene molecules suspended between two semi-infinite Ni electrodes via the thiol group. We examine the spin-dependence transport on Ni-n-acenes-Ni junctions, while the number of fused benzene rings varies between 1 and 15. Intriguingly, the induced magnetic moments of small acene molecules are higher than that of longer acene rings. The augmentation of fused benzene rings affects both the magnetic and transport features, such as the transmission function and conductance owing to their coupling to the Ni surface contacts via the anchoring group. The interplay between the spin-polarized transport properties, structural configuration and molecular electronic is a fortiori essential in these attractive molecular devices. Thus, this can conduct to the engineering of the electron spin transport in atomistic and molecular junctions. These prominent molecules convincingly infer that the molecular spin valves can conduct to thriving molecular devices.
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Affiliation(s)
- S. Caliskan
- Fatih University, Department of Physics, 34500, Buyukcekmece, Istanbul, Turkey
| | - A. Laref
- Department of Physics and Astronomy, College of Science, King Saud University, Riyadh, 11451 King Saudi Arabia
- Department of Physics, National Taiwan University, Taipei 106, Taiwan
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Caliskan S, Laref A. The anchoring effect on the spin transport properties and I-V characteristics of pentacene molecular devices suspended between nickel electrodes. Phys Chem Chem Phys 2014; 16:13191-208. [PMID: 24870063 DOI: 10.1039/c3cp54319f] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Spin-polarized transport properties are determined for pentacene sandwiched between Ni surface electrodes with various anchoring ligands. These calculations are carried out using spin density functional theory in tandem with a non-equilibrium Green's function technique. The presence of a Se atom at the edge of the pentacene molecule significantly modifies the transport properties of the device because Se has a different electronegativity than S. Our theoretical results clearly show a larger current for spin-up electrons than for spin-down electrons in the molecular junction that is attached asymmetrically across the Se linker at one side of the Ni electrodes (in an APL magnetic orientation). Moreover, this molecular junction exhibits pronounced NDR as the bias voltage is increased from 0.8 to 1.0 V. However, this novel NDR behavior is only detected in this promising pentacene molecular device. The NDR in the current-voltage (I-V) curve results from the narrowness of the density of states for the molecular states. The feasibility of controlling the TMR is also predicted in these molecular device nanostructures. Spin-dependent transmission calculations show that the sign and strength of the current-bias voltage characteristics and the TMR could be tailored for the organic molecule devices. These molecular junctions are joined symmetrically and asymmetrically between Ni metallic probes across the S and Se atoms (at the ends of the edges of the pentacene molecule). Our theoretical findings show that spin-valve phenomena can occur in these prototypical molecular junctions. The TMR and NDR results show that nanoscale junctions with spin valves could play a vital role in the production of novel functional molecular devices.
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Affiliation(s)
- S Caliskan
- Department of Physics, Fatih University, 34500, Buyukcekmece, Istanbul, Turkey
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Laref A, Alshammari N, Laref S, Luo SJ. A theoretical study of electronic and optical properties of SiC nanowires and their quantum confinement effects. Dalton Trans 2014; 43:5505-15. [DOI: 10.1039/c3dt52043a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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35
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Laref A, Laref S, Bin-Omran S. Electronic structure, X-ray absorption, and optical spectroscopy of LaCoO3 in the ground-state and excited-states. J Comput Chem 2011; 33:673-84. [DOI: 10.1002/jcc.22896] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2011] [Revised: 10/29/2011] [Accepted: 10/31/2011] [Indexed: 11/07/2022]
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36
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Laref A. Tight-binding molecular dynamics simulation of ZnSe liquid within the local environment dependence. J Comput Chem 2011; 33:1-10. [PMID: 21935967 DOI: 10.1002/jcc.21935] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2011] [Revised: 07/08/2011] [Accepted: 08/08/2011] [Indexed: 01/03/2023]
Abstract
We investigate the structural, electronic and dynamical properties of ZnSe liquid using tight-binding molecular dynamics (TBMD) simulations. We report the TBMD calculations for the solid and liquid forms of the ZnSe compound. To produce more realistic results the TB model includes the local environment dependence in the Hamiltonian matrix at finite temperature for ZnSe. To further demonstrate the efficiency of the TBMD approach, we present results for finite temperature physical properties of ZnSe liquid. We are able to show good agreement with experiment for the atomic mean-squared displacement and melting point.
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Affiliation(s)
- A Laref
- Department of Physics Science Faculty,King Saud University,Riyadh, 11451 Saudi Arabia
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37
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Laref A, Saşioglu E, Galanakis I. Exchange interactions, spin waves, and Curie temperature in zincblende half-metallic sp-electron ferromagnets: the case of CaZ (Z = N, P, As, Sb). J Phys Condens Matter 2011; 23:296001. [PMID: 21705831 DOI: 10.1088/0953-8984/23/29/296001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Using first-principle calculations in conjunction with the frozen-magnon technique we have calculated the exchange interactions and spin-wave dispersions in the series of the zincblende half-metallic II-V (CaZ, Z = N, P, As, Sb) ferromagnets. The calculated exchange constants are used to estimate the Curie temperature within the random phase approximation. The large Stoner gap in these alloys gives rise to well-defined undamped spin waves throughout the Brillouin zone. Moreover we show that the spin-wave stiffness constants for the considered systems are among the largest available for local moment ferromagnets. The predicted Curie temperature of half-metallic CaN is noticeably higher than the room temperature with respect to the other compounds, and thus we propose CaN as a promising candidate for future applications in spintronic devices.
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Affiliation(s)
- A Laref
- Department of Physics, Pohang University of Science and Technology, Pohang, Korea.
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Laref A, Saşioglu E, Sandratskii LM. First-principles investigation of magnetism of U films and U(001)(1)/Fe(110)(3) multilayers. J Phys Condens Matter 2006; 18:4177-4188. [PMID: 21690772 DOI: 10.1088/0953-8984/18/17/006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The magnetism of surfaces and interfaces can differ strongly from the magnetism of corresponding bulk materials. In the case of actinide systems the study of the surfaces and interfaces is still at the very beginning. In this work, we investigated the electronic and magnetic properties of U films and U(001)(1)/Fe(110)(3) multilayers within the framework of the density functional theory. We report both scalar-relativistic and fully relativistic calculations. The exchange correlation potential was treated in the generalized gradient approximation (GGA). In agreement with previous calculation by Stojić et al (2003 Phys. Rev. B 68 094407) we obtained the surface layer of the U films to be magnetic for the bulk lattice parameter. The dependence of the magnetic properties of the U films on the lattice parameter was studied. It is shown that decreasing distances between U atoms lead to decreasing magnetic moment and finally to the nonmagnetic ground state. The variation of the magnetic moment as a function of the lattice parameter is discontinuous. Using the frozen-magnon approach we evaluated the parameters of the inter-atomic exchange interactions and estimated the Curie temperature. The calculation for U(001)(1)/Fe(110)(3) multilayers showed that the U layer is magnetic with the direction of the U moments opposite to the Fe moments. The importance of the U-Fe hybridization is revealed. Both the intra-layer (U-U, Fe-Fe) and inter-layer (U-Fe) exchange interactions were evaluated. The temperature dependence of the layer magnetizations was studied within the random-phase approximation for the Heisenberg Hamiltonian for classical spins.
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Affiliation(s)
- A Laref
- Max-Planck-Institut für Mikrostrukturphysik, D-06120 Halle, Germany
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Sekkal W, Laref A, Zaoui A, Aourag H, Certier M. The Miscibility of Copper Halides Using a Three-Body Potential. I. CuClxBr1−xCrystal. Molecular Simulation 1999. [DOI: 10.1080/08927029908022117] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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