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Guo M, Liu M, Zhu J, Zhu Y, Guo F, Cai W, Zhang Y, Zhang Q, Sui J. Mechanism of Thermoelectric Performance Enhancement in CaMg 2 Bi 2 -Based Materials with Different Cation Site Doping. Small 2024; 20:e2306251. [PMID: 37691045 DOI: 10.1002/smll.202306251] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2023] [Revised: 08/29/2023] [Indexed: 09/12/2023]
Abstract
Chemical bonds determine electron and phonon transport in solids. Tailoring chemical bonding in thermoelectric materials causes desirable or compromise thermoelectric transport properties. In this work, taking an example of CaMg2 Bi2 with covalent and ionic bonds, density functional theory calculations uncover that element Zn, respectively, replacing Ca and Mg sites cause the weakness of ionic and covalent bonding. Electrically, Zn doping at both Ca and Mg sites increases carrier concentration, while the former leads to higher carrier concentration than that of the latter because of its lower vacancy formation energy. Both doping types increase density-of-state effective mass but their mechanisms are different. The Zn doping Ca site induces resonance level in valence band and Zn doping Mg site promotes orbital alignment. Thermally, point defect and the change of phonon dispersion introduced by doping result in pronounced reduction of lattice thermal conductivity. Finally, combining with the further increase of carrier concentration caused by Na doping and the modulation of band structure and the decrease of lattice thermal conductivity caused by Ba doping, a high figure-of-merit ZT of 1.1 at 823 K in Zn doping Ca sample is realized, which is competitive in 1-2-2 Zintl phase thermoelectric systems.
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Affiliation(s)
- Muchun Guo
- School of Materials Science and Engineering, Xihua University, Chengdu, 610039, China
| | - Ming Liu
- National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin, 150001, China
| | - Jianbo Zhu
- National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin, 150001, China
| | - Yuke Zhu
- National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin, 150001, China
| | - Fengkai Guo
- National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin, 150001, China
| | - Wei Cai
- National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin, 150001, China
| | - Yongsheng Zhang
- Advanced Research Institute of Multidisciplinary Sciences, Qufu Normal University, Qufu, 273165, China
| | - QinYong Zhang
- School of Materials Science and Engineering, Xihua University, Chengdu, 610039, China
| | - Jiehe Sui
- National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin, 150001, China
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Hong M, Li M, Wang Y, Shi XL, Chen ZG. Advances in Versatile GeTe Thermoelectrics from Materials to Devices. Adv Mater 2023; 35:e2208272. [PMID: 36366918 DOI: 10.1002/adma.202208272] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Revised: 10/24/2022] [Indexed: 06/16/2023]
Abstract
Driven by the intensive efforts in the development of high-performance GeTe thermoelectrics for mass-market application in power generation and refrigeration, GeTe-based materials display a high figure of merit of >2.0 and an energy conversion efficiency beyond 10%. However, a comprehensive review on GeTe, from fundamentals to devices, is still needed. In this regard, the latest progress on the state-of-the-art GeTe is timely reviewed. The phase transition, intrinsic high carrier concentration, and multiple band edges of GeTe are fundamentally analyzed from the perspectives of the native atomic orbital, chemical bonding, and lattice defects. Then, the fabrication methods are summarized with a focus on large-scale production. Afterward, the strategies for enhancing electronic transports of GeTe by energy filtering effect, resonance doping, band convergence, and Rashba band splitting, and the methods for strengthening phonon scatterings via nanoprecipitates, planar vacancies, and superlattices, are comprehensively reviewed. Besides, the device assembly and performance are highlighted. In the end, future research directions are concluded and proposed, which enlighten the development of broader thermoelectric materials.
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Affiliation(s)
- Min Hong
- Center for Future Materials, University of Southern Queensland, Springfield Central, Queensland, 4300, Australia
| | - Meng Li
- School of Chemistry and Physics, Queensland University of Technology, Brisbane, Queensland, 4000, Australia
| | - Yuan Wang
- School of Mechanical and Mining Engineering, The University of Queensland, Brisbane, Queensland, 4072, Australia
| | - Xiao-Lei Shi
- School of Chemistry and Physics, Queensland University of Technology, Brisbane, Queensland, 4000, Australia
| | - Zhi-Gang Chen
- School of Chemistry and Physics, Queensland University of Technology, Brisbane, Queensland, 4000, Australia
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3
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Wu Y, Xiang G, Zhang M, Wei D, Cheng C, Leng J, Ma H. Electronic Structures and Photoelectric Properties in Cs 3Sb 2X 9 (X = Cl, Br, or I) under High Pressure: A First Principles Study. Nanomaterials (Basel) 2022; 12:nano12172982. [PMID: 36080019 PMCID: PMC9457912 DOI: 10.3390/nano12172982] [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] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Revised: 08/25/2022] [Accepted: 08/26/2022] [Indexed: 05/31/2023]
Abstract
Lead-free perovskites of Cs3Sb2X9 (X = Cl, Br, or I) have attracted wide attention owing to their low toxicity. High pressure is an effective and reversible method to tune bandgap without changing the chemical composition. Here, the structural and photoelectric properties of Cs3Sb2X9 under high pressure were theoretically studied by using the density functional theory. The results showed that the ideal bandgap for Cs3Sb2X9 can be achieved by applying high pressure. Moreover, it was found that the change of the bandgap is caused by the shrinkage of the Sb-X long bond in the [Sb2X9]3- polyhedra. Partial density of states indicated that Sb-5s and X-p orbitals contribute to the top of the valence band, while Sb-5p and X-p orbitals dominate the bottom of the conduction band. Moreover, the band structure and density of states showed significant metallicity at 38.75, 24.05 GPa for Cs3Sb2Br9 and Cs3Sb2I9, respectively. Moreover, the absorption spectra showed the absorption edge redshifted, and the absorption coefficient of the Cs3Sb2X9 increased under high pressure. According to our calculated results, the narrow bandgap and enhanced absorption ability under high pressure provide a new idea for the design of the photovoltaic and photoelectric devices.
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Affiliation(s)
- Yanwen Wu
- Shandong Provincial Key Laboratory of Optics, Photonic Device and Collaborative Innovation Center of Light Manipulations and Applications, School of Physics and Electronics, Shandong Normal University, Jinan 250014, China
| | - Guangbiao Xiang
- Shandong Provincial Key Laboratory of Optics, Photonic Device and Collaborative Innovation Center of Light Manipulations and Applications, School of Physics and Electronics, Shandong Normal University, Jinan 250014, China
| | - Man Zhang
- Shandong Provincial Key Laboratory of Optics, Photonic Device and Collaborative Innovation Center of Light Manipulations and Applications, School of Physics and Electronics, Shandong Normal University, Jinan 250014, China
| | - Dongmei Wei
- Shandong Provincial Key Laboratory of Optics, Photonic Device and Collaborative Innovation Center of Light Manipulations and Applications, School of Physics and Electronics, Shandong Normal University, Jinan 250014, China
| | - Chen Cheng
- Shandong Provincial Key Laboratory of Optics, Photonic Device and Collaborative Innovation Center of Light Manipulations and Applications, School of Physics and Electronics, Shandong Normal University, Jinan 250014, China
| | - Jiancai Leng
- Department of Physics, School of Electronic and Information Engineering, Qilu University of Technology (Shandong Academy of Science), Jinan 250353, China
| | - Hong Ma
- Shandong Provincial Key Laboratory of Optics, Photonic Device and Collaborative Innovation Center of Light Manipulations and Applications, School of Physics and Electronics, Shandong Normal University, Jinan 250014, China
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4
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Hao X, Wu W, Zhu J, Song B, Meng Q, Wu M, Hua C, Yang SA, Zhou M. Topological band transition between hexagonal and triangular lattices with ( px, py) orbitals. J Phys Condens Matter 2022; 34:255504. [PMID: 35381579 DOI: 10.1088/1361-648x/ac6473] [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] [Received: 02/19/2022] [Accepted: 04/05/2022] [Indexed: 06/14/2023]
Abstract
By combining tight-binding modelling with density functional theory based first-principles calculations, we investigate the band evolution of two-dimensional (2D) hexagonal lattices with (px,py) orbitals, focusing on the electronic structures and topological phase transitions. The (px,py)-orbital hexagonal lattice model possesses two flat bands encompassing two linearly dispersive Dirac bands. Breaking the A/B sublattice symmetry could transform the model into two triangular lattices, each featuring a flat band and a dispersive band. Inclusion of the spin-orbit coupling and magnetization may give rise to quantum spin Hall and quantum anomalous Hall (QAH) states. As a proof of concept, we demonstrate that half-hydrogenated stanene is encoded by a triangular lattice with (px,py) orbitals, which exhibits ferromagnetism and QAH effect with a topological gap of ∼0.15 eV, feasible for experimental observation. These results provide insights into the structure-property relationships involving the orbital degree of freedom, which may shed light on future design and preparation of 2D topological materials for novel electronic/spintronic and quantum computing devices.
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Affiliation(s)
- Xiamin Hao
- School of Physics, Beihang University, Beijing 100191, People's Republic of China
- Beihang Hangzhou Innovation Institute Yuhang, Hangzhou 310023, People's Republic of China
- Research Laboratory for Quantum Materials, Singapore University of Technology and Design, Singapore 487372, Singapore
| | - Weikang Wu
- Research Laboratory for Quantum Materials, Singapore University of Technology and Design, Singapore 487372, Singapore
| | - Jiaojiao Zhu
- Research Laboratory for Quantum Materials, Singapore University of Technology and Design, Singapore 487372, Singapore
| | - Biyu Song
- School of Physics, Beihang University, Beijing 100191, People's Republic of China
- Beihang Hangzhou Innovation Institute Yuhang, Hangzhou 310023, People's Republic of China
| | - Qingling Meng
- School of Physics, Beihang University, Beijing 100191, People's Republic of China
- Beihang Hangzhou Innovation Institute Yuhang, Hangzhou 310023, People's Republic of China
| | - Meimei Wu
- Beihang Hangzhou Innovation Institute Yuhang, Hangzhou 310023, People's Republic of China
| | - Chenqiang Hua
- Beihang Hangzhou Innovation Institute Yuhang, Hangzhou 310023, People's Republic of China
| | - Shengyuan A Yang
- Research Laboratory for Quantum Materials, Singapore University of Technology and Design, Singapore 487372, Singapore
| | - Miao Zhou
- School of Physics, Beihang University, Beijing 100191, People's Republic of China
- Beihang Hangzhou Innovation Institute Yuhang, Hangzhou 310023, People's Republic of China
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5
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Fedorov IA. Study elastic properties of the leucine and isoleuicine from first principles calculations. J Phys Condens Matter 2022; 34:145702. [PMID: 35051912 DOI: 10.1088/1361-648x/ac4d5d] [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] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Accepted: 01/20/2022] [Indexed: 06/14/2023]
Abstract
I studied the elastic properties of crystalline L- and DL-forms of leucine and isoleucine within the framework of density functional theory with van der Waals interactions. The energy gaps of the considered crystals are 7.48-7.60 eV. Chiral molecules have the same chemical composition. Therefore, the study of crystalline amino acids provides a better understanding of how the structure of molecules affects mechanical properties of molecular crystals. Complete set of elastic constants for L-leucine, L-isoleucine, DL-leucine and DL-isoleucine were calculated. Linear compressibility of crystals has high anisotropy. The crystalline L- and DL-forms of leucine and isoleucine have different mechanical properties. Linear compressibility has a negative value for DL-isoleucine. My calculations predict that L-leucine and L-isoleucine are ductile compounds, while DL-leucine and DL-isoleucine are brittle compounds.
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Affiliation(s)
- Igor A Fedorov
- Kemerovo State University, Krasnaya 6, 650000, Kemerovo, Russia
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6
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Liu S, He D, Tan C, Fu S, Han X, Huang M, Miao Q, Zhang X, Wang Y, Peng H, Zhao H. Charge Transfer Properties of Heterostructures Formed by Bi 2 O 2 Se and Transition Metal Dichalcogenide Monolayers. Small 2022; 18:e2106078. [PMID: 34862734 DOI: 10.1002/smll.202106078] [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] [Received: 10/22/2021] [Indexed: 06/13/2023]
Abstract
Atomically thin bismuth oxyselenide (Bi2 O2 Se) exhibits attractive properties for electronic and optoelectronic applications, such as high charge-carrier mobility and good air stability. Recently, the development of Bi2 O2 Se-based heterostructures have attracted enormous interests with promising prospects for diverse device applications. Although the electrical properties of Bi2 O2 Se-based heterostructures have been widely studied, the interlayer charge transfer in these heterostructures remains elusive, despite its importance in harnessing their emergent functionalities. Here, a comprehensive experimental investigation on the interlayer charge transfer properties of two heterostructures formed by Bi2 O2 Se and representative transition metal dichalcogenides (namely, WS2 /Bi2 O2 Se and MoS2 /Bi2 O2 Se) is reported. Kelvin probe force microscopy is used to measure the work functions of the samples, which are further employed to establish type-II band alignment of both heterostructures. Photoluminescence quenching is observed in each heterostructure, suggesting high charge transfer efficiency. Time-resolved and layer-selective pump-probe measurements further prove the ultrafast interlayer charge transfer processes and formation of long-lived interlayer excitons. These results establish the feasibility of integrating 2D Bi2 O2 Se with other 2D semiconductors to fabricate heterostructures with novel charge transfer properties and provide insight for understanding the performance of optoelectronic devices based on such 2D heterostructures.
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Affiliation(s)
- Shuangyan Liu
- Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing, 100044, P. R. China
| | - Dawei He
- Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing, 100044, P. R. China
| | - Congwei Tan
- Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences (BNLMS), College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, P. R. China
| | - Shaohua Fu
- Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing, 100044, P. R. China
| | - Xiuxiu Han
- Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing, 100044, P. R. China
| | - Mohan Huang
- Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing, 100044, P. R. China
| | - Qing Miao
- Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing, 100044, P. R. China
| | - Xiaoxian Zhang
- Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing, 100044, P. R. China
| | - Yongsheng Wang
- Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing, 100044, P. R. China
| | - Hailin Peng
- Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences (BNLMS), College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, P. R. China
| | - Hui Zhao
- Department of Physics and Astronomy, The University of Kansas, Lawrence, KS, 66045, USA
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7
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Li SQ, Liu X, Wang X, Liu H, Zhang G, Zhao J, Gao J. Eliminating Edge Electronic and Phonon States of Phosphorene Nanoribbon by Unique Edge Reconstruction. Small 2022; 18:e2105130. [PMID: 34862720 DOI: 10.1002/smll.202105130] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Revised: 10/18/2021] [Indexed: 06/13/2023]
Abstract
Edge termination plays a vital role in determining the properties of 2D materials. By performing compelling ab initio simulations, a lowest-energy U-edge [ZZ(U)] reconstruction is revealed in the bilayer phosphorene. Such reconstruction reduces 60% edge energy compared with the pristine one and occurs almost without an energy barrier, implying it should be the dominating edge in reality. The electronic band structure of phosphorene nanoribbon with such reconstruction resembles that of an intrinsic 2D layer, exhibiting nearly edgeless band characteristics. Although ZZ(U) changes the topology of phosphorene nanoribbons, simulated transmission electron microscope, scanning transmission electron microscope and scanning tunneling microscope images indicate it is very hard to be identified. One possible identified method is infrared/Raman analyses because the ZZ(U) edge alters vibrational modes dramatically. In addition, it also increases the thermal conductivity of PNR 1.4 and 2.3 times than the pristine and Klein edges.
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Affiliation(s)
- Shi-Qi Li
- Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Dalian University of Technology), Ministry of Education, Dalian, 116024, China
| | - Xiangjun Liu
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Institute of Micro-/Nano Electromechanical System, College of Mechanical Engineering, Donghua University, Shanghai, China
| | - Xujun Wang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Institute of Micro-/Nano Electromechanical System, College of Mechanical Engineering, Donghua University, Shanghai, China
| | - Hongsheng Liu
- Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Dalian University of Technology), Ministry of Education, Dalian, 116024, China
| | - Gang Zhang
- Institute of High-Performance Computing, A*STAR, Singapore
| | - Jijun Zhao
- Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Dalian University of Technology), Ministry of Education, Dalian, 116024, China
| | - Junfeng Gao
- Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Dalian University of Technology), Ministry of Education, Dalian, 116024, China
- Institute of High-Performance Computing, A*STAR, Singapore
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8
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Ghosh A, Jana S, Niranjan MK, Behera SK, Constantin LA, Samal P. Improved electronic structure prediction of chalcopyrite semiconductors from a semilocal density functional based on Pauli kinetic energy enhancement factor. J Phys Condens Matter 2021; 34:075501. [PMID: 34768248 DOI: 10.1088/1361-648x/ac394d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Accepted: 11/12/2021] [Indexed: 06/13/2023]
Abstract
The correct treatment ofdelectrons is of prime importance in order to predict the electronic properties of the prototype chalcopyrite semiconductors. The effect ofdstates is linked with the anion displacement parameteru, which in turn influences the bandgap of these systems. Semilocal exchange-correlation functionals which yield good structural properties of semiconductors and insulators often fail to predict reasonableubecause of the underestimation of the bandgaps arising from the strong interplay betweendelectrons. In the present study, we show that the meta-generalized gradient approximation (meta-GGA) obtained from the cuspless hydrogen density (MGGAC) (2019Phys. Rev.B 100 155140) performs in an improved manner in apprehending the key features of the electronic properties of chalcopyrites, and its bandgaps are comparative to that obtained using state-of-art hybrid methods. Moreover, the present assessment also shows the importance of the Pauli kinetic energy enhancement factor,α= (τ-τW)/τunifin describing thedelectrons in chalcopyrites. The present study strongly suggests that the MGGAC functional within semilocal approximations can be a better and preferred choice to study the chalcopyrites and other solid-state systems due to its superior performance and significantly low computational cost.
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Affiliation(s)
- Arghya Ghosh
- Department of Physics, Indian Institute of Technology, Hyderabad, India
| | - Subrata Jana
- School of Physical Sciences, National Institute of Science Education and Research, HBNI, Bhubaneswar 752050, India
- Department of Chemistry & Biochemistry, The Ohio State University, Columbus, OH 43210, United States of America
| | - Manish K Niranjan
- Department of Physics, Indian Institute of Technology, Hyderabad, India
| | - Sushant Kumar Behera
- School of Physical Sciences, National Institute of Science Education and Research, HBNI, Bhubaneswar 752050, India
| | - Lucian A Constantin
- Istituto di Nanoscienze, Consiglio Nazionale delle Ricerche CNR-NANO, 41125 Modena, Italy
| | - Prasanjit Samal
- School of Physical Sciences, National Institute of Science Education and Research, HBNI, Bhubaneswar 752050, India
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9
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Xun S, Li H, Sini G, Bredas JL. Impact of Imine Bond Orientations on the Geometric and Electronic Structures of Imine-based Covalent Organic Frameworks. Chem Asian J 2021; 16:3781-3789. [PMID: 34624932 DOI: 10.1002/asia.202101011] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [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: 08/27/2021] [Revised: 10/05/2021] [Indexed: 11/05/2022]
Abstract
Many efforts are currently devoted to improving the stability and crystallinity of imine-based two-dimensional (2D) covalent organic frameworks (COFs) given their wide range of potential applications. The variation in the relative orientations of the imine bonds has been found to be a critical factor that impacts the stacking of the 2D COF layers, leads to the formation of isomer structures, and influences the crystallinity of the final product. Most investigations to date have focused only on the structural properties, while the role of the imine orientations on the electronic properties has not been studied systematically. Here, we explore this effect by examining how the electronic band structures, electronic couplings, and effective masses evolve when considering four isomeric structures of an imine-linked tetraphenyl-pyrene naphthalene-diimide COF. Our results provide an understanding of the impact of the imine orientations and how they need to be controlled to realize COF inter-layer stackings that can lead to efficient cross-plane electron transport. They can be used to guide the design and synthesis of imine-based COFs for applications where charge transport needs to be optimized.
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Affiliation(s)
- Sangni Xun
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, P. R. China.,School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics, Georgia Institute of Technology, Atlanta, GA 30332-0400, USA
| | - Hong Li
- Department of Chemistry and Biochemistry, The University of Arizona, Tucson, Arizona 85721-0008, USA
| | - Gjergji Sini
- Department of Chemistry and Biochemistry, The University of Arizona, Tucson, Arizona 85721-0008, USA.,Laboratoire de Physicochimie des Polymères et des Interfaces, CY Cergy Paris Université, Cergy-Pontoise Cedex, 95031, France
| | - Jean-Luc Bredas
- Department of Chemistry and Biochemistry, The University of Arizona, Tucson, Arizona 85721-0008, USA
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10
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Xiang G, Wu Y, Li Y, Cheng C, Leng J, Ma H. Structural and Optoelectronic Properties of Two-Dimensional Ruddlesden-Popper Hybrid Perovskite CsSnBr 3. Nanomaterials (Basel) 2021; 11:2119. [PMID: 34443949 DOI: 10.3390/nano11082119] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/25/2021] [Revised: 08/14/2021] [Accepted: 08/18/2021] [Indexed: 11/16/2022]
Abstract
Ultrathin inorganic halogenated perovskites have attracted attention owing to their excellent photoelectric properties. In this work, we designed two types of Ruddlesden-Popper hybrid perovskites, Csn+1SnnBr3n+1 and CsnSnn+1Br3n+2, and studied their band structures and band gaps as a function of the number of layers (n = 1-5). The calculation results show that Csn+1SnnBr3n+1 has a direct bandgap while the bandgap of CsnSnn+1Br3n+2 can be altered from indirect to direct, induced by the 5p-Sn state. As the layers increased from 1 to 5, the bandgap energies of Csn+1SnnBr3n+1 and CsnSnn+1Br3n+2 decreased from 1.209 to 0.797 eV and 1.310 to 1.013 eV, respectively. In addition, the optical absorption of Csn+1SnnBr3n+1 and CsnSnn+1Br3n+2 was blue-shifted as the structure changed from bulk to nanolayer. Compared with that of Csn+1SnnBr3n+1, the optical absorption of CsnSnn+1Br3n+2 was sensitive to the layers along the z direction, which exhibited anisotropy induced by the SnBr2-terminated surface.
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11
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Abstract
Smarter and minimization of devices are consistently substantial to shape the energy landscape. Significant amounts of endeavours have come forward as promising steps to surmount this formidable challenge. It is undeniable that material scientists were contemplating smarter material beyond purely inorganic or organic materials. To our delight, metal-organic frameworks (MOFs), an inorganic-organic hybrid scaffold with unprecedented tunability and smart functionalities, have recently started their journey as an alternative. In this review, we focus on such propitious potential of MOFs that was untapped over a long time. We cover the synthetic strategies and (or) post-synthetic modifications towards the formation of conductive MOFs and their underlying concepts of charge transfer with structural aspects. We addressed theoretical calculations with the experimental outcomes and spectroelectrochemistry, which will trigger vigorous impetus about intrinsic electronic behaviour of the conductive frameworks. Finally, we discussed electrocatalysts and energy storage devices stemming from conductive MOFs to meet energy demand in the near future.
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Affiliation(s)
- Akashdeep Nath
- School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram, Kerala, 695551, India
| | - K S Asha
- School of Chemistry and Biochemistry, M. S. Ramaiah College of Arts Science and Commerce, Bangaluru, 560054, India
| | - Sukhendu Mandal
- School of Chemistry, Indian Institute of Science Education and Research, Thiruvananthapuram, Kerala, 695551, India
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12
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Mroweh N, Mézière C, Pop F, Auban-Senzier P, Alemany P, Canadell E, Avarvari N. In Search of Chiral Molecular Superconductors: κ-[(S,S)-DM-BEDT-TTF] 2 ClO 4 Revisited. Adv Mater 2020; 32:e2002811. [PMID: 32715564 DOI: 10.1002/adma.202002811] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2020] [Revised: 06/18/2020] [Indexed: 06/11/2023]
Abstract
The relationship between chirality and superconductivity is an intriguing question. The two enantiomeric crystalline radical cation salts κ-[(S,S)-DM-BEDT-TTF]2 ClO4 and κ-[(R,R)-DM-BEDT-TTF]2 ClO4 , showing κ-type arrangement of the organic layers, are investigated in search for superconducting chiral molecular materials following a 1992 report indicating the occurrence of a superconducting transition in the former compound. While the initial interpretation is presently challenged through in-depth temperature and pressure dependent single crystal resistivity measurements combined with band structure calculations, the two chiral conductors show metal like behavior with room temperature conductivities of 10-30 S cm-1 at ambient pressure and stabilization of the metallic state down to the lowest temperatures under moderate pressures. Moreover, their structural and theoretical investigations reveal an original feature, namely the existence of two different κ layers with 1D and 2D electronic dimensionality, respectively, as a consequence of an interlayer charge transfer. The resistivity drop observed for one sample below 1 K and insensitive to magnetic field, possibly results from mixing in-plane and out-of-plane contributions to the measured resistance and suggests current induced charge order melting. This feature contradicts the occurrence of superconductivity in these chiral molecular conductors and leaves open the discovery of the first chiral molecular superconductors.
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Affiliation(s)
- Nabil Mroweh
- MOLTECH-Anjou, UMR 6200, CNRS, UNIV Angers, 2 bd Lavoisier, Angers Cedex, 49045, France
| | - Cécile Mézière
- MOLTECH-Anjou, UMR 6200, CNRS, UNIV Angers, 2 bd Lavoisier, Angers Cedex, 49045, France
| | - Flavia Pop
- MOLTECH-Anjou, UMR 6200, CNRS, UNIV Angers, 2 bd Lavoisier, Angers Cedex, 49045, France
| | - Pascale Auban-Senzier
- Laboratoire de Physique des Solides, Université Paris-Saclay, CNRS UMR 8502, Orsay, 91405, France
| | - Pere Alemany
- Departament de Ciència de Materials i Química Física and Institut de Química Teòrica i Computacional (IQTCUB), Universitat de Barcelona, Martí i Franquès 1, Barcelona, 08028, Spain
| | - Enric Canadell
- Institut de Ciència de Materials de Barcelona (CSIC), Campus de la UAB, Bellaterra, Barcelona, E-08193, Spain
| | - Narcis Avarvari
- MOLTECH-Anjou, UMR 6200, CNRS, UNIV Angers, 2 bd Lavoisier, Angers Cedex, 49045, France
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13
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Jiao Y, Hafez AM, Cao D, Mukhopadhyay A, Ma Y, Zhu H. Metallic MoS 2 for High Performance Energy Storage and Energy Conversion. Small 2018; 14:e1800640. [PMID: 30058290 DOI: 10.1002/smll.201800640] [Citation(s) in RCA: 85] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2018] [Revised: 05/08/2018] [Indexed: 05/24/2023]
Abstract
Metallic phase 2D molybdenum disulfide (MoS2 ) is an emerging class of materials with remarkably higher electrical conductivity and catalytic activities. The goal of this study is to review the atomic structures and electrochemistry of metallic MoS2 , which is essential for a wide range of existing and new enabling technologies. The scope of this paper ranges from the atomic structure, band structure, electrical and optical properties to fabrication methods, and major emerging applications in electrochemical energy storage and energy conversion. This paper also thoroughly covers the atomic structure-properties-application relationships of metallic MoS2 . Understanding the fundamental properties of these structures is crucial for designing and manufacturing products for emerging applications. Today, a more holistic understanding of the interplay between the structure, chemistry, and performance of metallic MoS2 is advancing actual applications of this material. This new level of understanding also enables a myriad of new and exciting applications, which motivated this review. There are excellent reviews already on the traditional semiconducting MoS2 , and this review, for the first time, focuses on the uniqueness of conducting metallic MoS2 for energy applications and offers brand new materials for clean energy application.
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Affiliation(s)
- Yucong Jiao
- Department of Mechanical and Industrial Engineering, Northeastern University, Boston, MA, 02115, USA
| | - Ahmed M Hafez
- Department of Mechanical and Industrial Engineering, Northeastern University, Boston, MA, 02115, USA
| | - Daxian Cao
- Department of Mechanical and Industrial Engineering, Northeastern University, Boston, MA, 02115, USA
| | - Alolika Mukhopadhyay
- Department of Mechanical and Industrial Engineering, Northeastern University, Boston, MA, 02115, USA
| | - Yi Ma
- Department of Mechanical and Industrial Engineering, Northeastern University, Boston, MA, 02115, USA
| | - Hongli Zhu
- Department of Mechanical and Industrial Engineering, Northeastern University, Boston, MA, 02115, USA
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14
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Ding Y, Wu R, Abidi IH, Wong H, Liu Z, Zhuang M, Gan LY, Luo Z. Stacking Modes-Induced Chemical Reactivity Differences on Chemical Vapor Deposition-Grown Trilayer Graphene. ACS Appl Mater Interfaces 2018; 10:23424-23431. [PMID: 29916694 DOI: 10.1021/acsami.8b05635] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Trilayer graphene (TLG) synthesized by chemical vapor deposition (CVD), in particular the twisted TLG, exhibits sophisticated electronic structures that depend on their stacking modes. Here, we computationally and experimentally demonstrate the chemical reactivity differences of CVD-TLG induced by the stacking modes and corroborated by a photoexcited phenyl-grafting reaction. The experimental results show that the ABA stacking TLGs have the most inert chemical property, yet 30°-30° stacking twisted TLGs are the most active. Further, density functional theory calculations have shown that the chemical reactivity difference can be quantitatively explained by the differences in the number of hot electrons generated in their valence band during irradiation. The activity difference is further verified by the calculated adsorption energy of phenyl on the TLGs. Our work provides insight into the chemistry of TLG and addresses the challenges associated with selective functionalization of TLG with phenyl groups. The understandings developed in this project can also guide the future development of TLG-based functional devices.
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Affiliation(s)
- Yao Ding
- Department of Chemical and Biological Engineering , The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon 999077 , Hong Kong
| | - Ruizhe Wu
- Department of Chemical and Biological Engineering , The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon 999077 , Hong Kong
| | - Irfan Haider Abidi
- Department of Chemical and Biological Engineering , The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon 999077 , Hong Kong
| | - Hoilun Wong
- Department of Chemical and Biological Engineering , The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon 999077 , Hong Kong
| | - Zhenjing Liu
- Department of Chemical and Biological Engineering , The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon 999077 , Hong Kong
| | - Minghao Zhuang
- Department of Chemical and Biological Engineering , The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon 999077 , Hong Kong
| | - Li-Yong Gan
- School of Materials Science and Engineering, Key Laboratory of Advanced Energy Storage Materials of Guangdong Province , South China University of Technology , Guangzhou 510641 , P.R. China
| | - Zhengtang Luo
- Department of Chemical and Biological Engineering , The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon 999077 , Hong Kong
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15
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Xu B, Feng T, Agne MT, Tan Q, Li Z, Imasato K, Zhou L, Bahk JH, Ruan X, Snyder GJ, Wu Y. Manipulating Band Structure through Reconstruction of Binary Metal Sulfide for High-Performance Thermoelectrics in Solution-Synthesized Nanostructured Bi 13 S 18 I 2. Angew Chem Int Ed Engl 2018; 57:2413-2418. [PMID: 29356282 DOI: 10.1002/anie.201713223] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [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: 01/01/2018] [Indexed: 11/09/2022]
Abstract
Reconstructing canonical binary compounds by inserting a third agent can significantly modify their electronic and phonon structures. Therefore, it has inspired the semiconductor communities in various fields. Introducing this paradigm will potentially revolutionize thermoelectrics as well. Using a solution synthesis, Bi2 S3 was rebuilt by adding disordered Bi and weakly bonded I. These new structural motifs and the altered crystal symmetry induce prominent changes in electrical and thermal transport, resulting in a great enhancement of the figure of merit. The as-obtained nanostructured Bi13 S18 I2 is the first non-toxic, cost-efficient, and solution-processable n-type material with z T=1.0.
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Affiliation(s)
- Biao Xu
- Department of Chemical and Biological Engineering, Iowa State University, Ames, IA, 50011, USA.,College of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu, 210094, China
| | - Tianli Feng
- Department of Mechanical Engineering, Purdue University, West Lafayette, IN, 47907, USA
| | - Matthias T Agne
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208, USA
| | - Qing Tan
- State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China
| | - Zhe Li
- Department of Chemical and Biological Engineering, Iowa State University, Ames, IA, 50011, USA
| | - Kazuki Imasato
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208, USA
| | - Lin Zhou
- Ames Laboratory, Department of Energy, Ames, IA, 50011, USA
| | - Je-Hyeong Bahk
- Department of Mechanical and Materials Engineering, University of Cincinnati, Cincinnati, OH, 45221, USA
| | - Xiulin Ruan
- Department of Mechanical Engineering, Purdue University, West Lafayette, IN, 47907, USA
| | - G Jeffery Snyder
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208, USA
| | - Yue Wu
- Department of Chemical and Biological Engineering, Iowa State University, Ames, IA, 50011, USA
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16
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Bos JWG. Theoretical prediction of strain tuneable quaternary spintronic Heusler compounds. IUCrJ 2017; 4:712-713. [PMID: 29123671 PMCID: PMC5668854 DOI: 10.1107/s2052252517015299] [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] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Heusler materials have attracted a large amount of attention in the development of spintronic technologies. In this issue, Wang et al. [IUCrJ (2017), 4, 758-768] show how strain can be used to tune the band structure of these materials.
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Affiliation(s)
- Jan-Willem G. Bos
- Institute of Chemical Sciences and Centre for Advanced Energy Storage and Recovery, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, UK
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17
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Wang X, Cheng Z, Liu G, Dai X, Khenata R, Wang L, Bouhemadou A. Rare earth-based quaternary Heusler compounds MCoV Z ( M = Lu, Y; Z = Si, Ge) with tunable band characteristics for potential spintronic applications. IUCrJ 2017; 4:758-768. [PMID: 29123678 PMCID: PMC5668861 DOI: 10.1107/s2052252517013264] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/17/2017] [Accepted: 09/15/2017] [Indexed: 06/07/2023]
Abstract
Magnetic Heusler compounds (MHCs) have recently attracted great attention since these types of material provide novel functionalities in spintronic and magneto-electronic devices. Among the MHCs, some compounds have been predicted to be spin-filter semiconductors [also called magnetic semiconductors (MSs)], spin-gapless semiconductors (SGSs) or half-metals (HMs). In this work, by means of first-principles calculations, it is demonstrated that rare earth-based equiatomic quaternary Heusler (EQH) compounds with the formula MCoVZ (M = Lu, Y; Z = Si, Ge) are new spin-filter semiconductors with total magnetic moments of 3 µB. Furthermore, under uniform strain, there are physical transitions from spin-filter semiconductor (MS) → SGS → HM for EQH compounds with the formula LuCoVZ, and from HM → SGS → MS → SGS → HM for EQH compounds with the formula YCoVZ. Remarkably, for YCoVZ EQH compounds there are not only diverse physical transitions, but also different types of spin-gapless feature that can be observed with changing lattice constants. The structural stability of these four EQH compounds is also examined from the points of view of formation energy, cohesive energy and mechanical behaviour. This work is likely to inspire consideration of rare earth-based EQH compounds for application in future spintronic and magneto-electronic devices.
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Affiliation(s)
- Xiaotian Wang
- School of Physical Science and Technology, Southwest University, Chongqing 400715, People’s Republic of China
- Institute for Superconducting and Electronic Materials (ISEM), University of Wollongong, Wollongong 2500, Australia
| | - Zhenxiang Cheng
- Institute for Superconducting and Electronic Materials (ISEM), University of Wollongong, Wollongong 2500, Australia
| | - Guodong Liu
- School of Material Sciences and Engineering, Hebei University of Technology, Tianjin 300130, People’s Republic of China
| | - Xuefang Dai
- School of Material Sciences and Engineering, Hebei University of Technology, Tianjin 300130, People’s Republic of China
| | - Rabah Khenata
- Laboratoire de Physique Quantique, de la Matière et de la Modélisation Mathématique (LPQ3M), Université de Mascara, Mascara 29000, Algeria
| | - Liying Wang
- School of Material Sciences and Engineering, Hebei University of Technology, Tianjin 300130, People’s Republic of China
| | - Abdelmadjid Bouhemadou
- Laboratory for Developing New Materials and their Characterization, University of Setif 1, Setif 19000, Algeria
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18
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Wang X, Cheng Z, Wang W. L2₁ and XA Ordering Competition in Hafnium-Based Full-Heusler Alloys Hf₂VZ (Z = Al, Ga, In, Tl, Si, Ge, Sn, Pb). Materials (Basel) 2017; 10:E1200. [PMID: 29053598 DOI: 10.3390/ma10101200] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/16/2017] [Revised: 10/15/2017] [Accepted: 10/15/2017] [Indexed: 12/04/2022]
Abstract
For theoretical designing of full-Heusler based spintroinc materials, people have long believed in the so-called Site Preference Rule (SPR). Very recently, according to the SPR, there are several studies on XA-type Hafnium-based Heusler alloys X2YZ, i.e., Hf2VAl, Hf2CoZ (Z = Ga, In) and Hf2CrZ (Z = Al, Ga, In). In this work, a series of Hf2-based Heusler alloys, Hf2VZ (Z = Al, Ga, In, Tl, Si, Ge, Sn, Pb), were selected as targets to study the site preferences of their atoms by first-principle calculations. It has been found that all of them are likely to exhibit the L21-type structure instead of the XA one. Furthermore, we reveal that the high values of spin-polarization of XA-type Hf2VZ (Z = Al, Ga, In, Tl, Si, Ge, Sn, Pb) alloys have dropped dramatically when they form the L21-type structure. Also, we prove that the electronic, magnetic, and physics nature of these alloys are quite different, depending on the L21-type or XA-type structures.
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19
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Lin JC, Tra VT, Tsai DS, Lin TT, Huang PC, Hsu WL, Wu HJ, Huang R, Van Chien N, Yoshida R, Lin JY, Ikuhara Y, Chiu YP, Gwo S, Tsai DP, He JH, Chu YH. Control of the Metal-Insulator Transition at Complex Oxide Heterointerfaces through Visible Light. Adv Mater 2016; 28:764-770. [PMID: 26607052 DOI: 10.1002/adma.201503499] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2015] [Revised: 10/14/2015] [Indexed: 06/05/2023]
Abstract
The coupling of the localized surface plasmon resonance of Au nanoparticles is utilized to deliver a visible-light stimulus to control conduction at the LaAlO3 /SrTiO3 interface. A giant photoresponse and the controllable metal-insulator transition are characterized at this heterointerface. This study paves a new route to optical control of the functionality at the heterointerfaces.
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Affiliation(s)
- Jheng-Cyuan Lin
- Institute of Physics, Academia Sinica, Taipei, 11529, Taiwan
| | - Vu Thanh Tra
- Institute of Physics, National Chiao Tung University, Hsinchu, 30010, Taiwan
| | - Dung-Sheng Tsai
- Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei, 10617, Taiwan
- Research Center for Applied Sciences, Academia Sinica, Taipei, 11529, Taiwan
| | - Tai-Te Lin
- Department of Physics, National Sun Yat-sen University, Kaohsiung, 804, Taiwan
| | - Po-Cheng Huang
- Department of Physics, National Sun Yat-sen University, Kaohsiung, 804, Taiwan
| | - Wei-Lun Hsu
- Department of Physics, National Taiwan University, Taipei, 10617, Taiwan
| | - Hui Jun Wu
- Department of Physics, National Taiwan University, Taipei, 10617, Taiwan
| | - Rong Huang
- Key Laboratory of Polar Materials and Devices, Ministry of Education, East China Normal University, Shanghai, 200062, China
- Nanostructures Research Laboratory, Japan Fine Ceramics Center, Nagoya, 456-8587, Japan
| | - Nguyen Van Chien
- Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu, 30010, Taiwan
| | - Ryuji Yoshida
- Nanostructures Research Laboratory, Japan Fine Ceramics Center, Nagoya, 456-8587, Japan
| | - Jiunn-Yuan Lin
- Institute of Physics, National Chiao Tung University, Hsinchu, 30010, Taiwan
| | - Yuichi Ikuhara
- Nanostructures Research Laboratory, Japan Fine Ceramics Center, Nagoya, 456-8587, Japan
- Institute of Engineering Innovation, The University of Tokyo, Tokyo, 113-8656, Japan
| | - Ya-Ping Chiu
- Department of Physics, National Sun Yat-sen University, Kaohsiung, 804, Taiwan
- Department of Physics, National Taiwan Normal University, Taipei, 116, Taiwan
| | - Shangjr Gwo
- Department of Physics, National Tsing-Hua University, Hsinchu, 30013, Taiwan
| | - Din Ping Tsai
- Research Center for Applied Sciences, Academia Sinica, Taipei, 11529, Taiwan
- Department of Physics, National Taiwan University, Taipei, 10617, Taiwan
| | - Jr-Hau He
- Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei, 10617, Taiwan
- Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Ying-Hao Chu
- Institute of Physics, Academia Sinica, Taipei, 11529, Taiwan
- Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu, 30010, Taiwan
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20
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Ju H, Knesting KM, Zhang W, Pan X, Wang CH, Yang YW, Ginger DS, Zhu J. Interplay between Interfacial Structures and Device Performance in Organic Solar Cells: A Case Study with the Low Work Function Metal, Calcium. ACS Appl Mater Interfaces 2016; 8:2125-31. [PMID: 26716763 DOI: 10.1021/acsami.5b10641] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
A better understanding of how interfacial structure affects charge carrier recombination would benefit the development of highly efficient organic photovoltaic (OPV) devices. In this paper, transient photovoltage (TPV) and charge extraction (CE) measurements are used in combination with synchrotron radiation photoemission spectroscopy (SRPES) to gain insight into the correlation between interfacial properties and device performance. OPV devices based on PCDTBT/PC71BM with a Ca interlayer were studied as a reference system to investigate the interfacial effects on device performance. Devices with a Ca interlayer exhibit a lower recombination than devices with only an Al cathode at a given charge carrier density (n). In addition, the interfacial band structures indicate that the strong dipole moment produced by the Ca interlayer can facilitate the extraction of electrons and drive holes away from the cathode/polymer interface, resulting in beneficial reduction in interfacial recombination losses. These results help explain the higher efficiencies of devices made with Ca interlayers compared to that without the Ca interlayer.
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Affiliation(s)
- Huanxin Ju
- National Synchrotron Radiation Laboratory and Collaborative Innovation Center of Suzhou Nano Science and Technology, University of Science and Technology of China , Hefei, Anhui 230029, People's Republic of China
- Department of Chemistry, University of Washington , Seattle, Washington 98195, United States
- Hefei Science Center, Chinese Academy of Sciences , Hefei, Anhui 230029, People's Republic of China
| | - Kristina M Knesting
- Department of Chemistry, University of Washington , Seattle, Washington 98195, United States
| | - Wei Zhang
- National Synchrotron Radiation Laboratory and Collaborative Innovation Center of Suzhou Nano Science and Technology, University of Science and Technology of China , Hefei, Anhui 230029, People's Republic of China
| | - Xiao Pan
- National Synchrotron Radiation Laboratory and Collaborative Innovation Center of Suzhou Nano Science and Technology, University of Science and Technology of China , Hefei, Anhui 230029, People's Republic of China
| | - Chia-Hsin Wang
- National Synchrotron Radiation Research Center , Hsinchu 30076, Taiwan
| | - Yaw-Wen Yang
- National Synchrotron Radiation Research Center , Hsinchu 30076, Taiwan
| | - David S Ginger
- Department of Chemistry, University of Washington , Seattle, Washington 98195, United States
| | - Junfa Zhu
- National Synchrotron Radiation Laboratory and Collaborative Innovation Center of Suzhou Nano Science and Technology, University of Science and Technology of China , Hefei, Anhui 230029, People's Republic of China
- Hefei Science Center, Chinese Academy of Sciences , Hefei, Anhui 230029, People's Republic of China
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