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Bianchi MG, Risplendi F, Re Fiorentin M, Cicero G. Engineering the Electrical and Optical Properties of WS 2 Monolayers via Defect Control. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2305162. [PMID: 38009517 PMCID: PMC10811516 DOI: 10.1002/advs.202305162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Revised: 09/25/2023] [Indexed: 11/29/2023]
Abstract
Two-dimensional (2D) materials as tungsten disulphide (WS2 ) are rising as the ideal platform for the next generation of nanoscale devices due to the excellent electric-transport and optical properties. However, the presence of defects in the as grown samples represents one of the main limiting factors for commercial applications. At the same time, WS2 properties are frequently tailored by introducing impurities at specific sites. Aim of this review paper is to present a complete description and discussion of the effects of both intentional and unintentional defects in WS2 , by an in depth analysis of the recent experimental and theoretical investigations reported in the literature. First, the most frequent intrinsic defects in WS2 are presented and their effects in the readily synthetized material are discussed. Possible solutions to remove and heal unintentional defects are also analyzed. Following, different doping schemes are reported, including the traditional substitution approach and innovative techniques based on the surface charge transfer with adsorbed atoms or molecules. The plethora of WS2 monolayer modifications presented in this review and the systematic analysis of the corresponding optical and electronic properties, represent strategic degrees of freedom the researchers may exploit to tailor WS2 optical and electronic properties for specific device applications.
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Affiliation(s)
- Michele Giovanni Bianchi
- Department of Applied Science and TechnologyPolitecnico di Torinocorso Duca degli Abruzzi 24Torino10129Italy
| | - Francesca Risplendi
- Department of Applied Science and TechnologyPolitecnico di Torinocorso Duca degli Abruzzi 24Torino10129Italy
| | - Michele Re Fiorentin
- Department of Applied Science and TechnologyPolitecnico di Torinocorso Duca degli Abruzzi 24Torino10129Italy
| | - Giancarlo Cicero
- Department of Applied Science and TechnologyPolitecnico di Torinocorso Duca degli Abruzzi 24Torino10129Italy
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2
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Palei S, Murali G, Kim CH, In I, Lee SY, Park SJ. A Review on Interface Engineering of MXenes for Perovskite Solar Cells. NANO-MICRO LETTERS 2023; 15:123. [PMID: 37160615 PMCID: PMC10169986 DOI: 10.1007/s40820-023-01083-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2023] [Accepted: 03/21/2023] [Indexed: 05/11/2023]
Abstract
With an excellent power conversion efficiency of 25.7%, closer to the Shockley-Queisser limit, perovskite solar cells (PSCs) have become a strong candidate for a next-generation energy harvester. However, the lack of stability and reliability in PSCs remained challenging for commercialization. Strategies, such as interfacial and structural engineering, have a more critical influence on enhanced performance. MXenes, two-dimensional materials, have emerged as promising materials in solar cell applications due to their metallic electrical conductivity, high carrier mobility, excellent optical transparency, wide tunable work function, and superior mechanical properties. Owing to different choices of transition elements and surface-terminating functional groups, MXenes possess the feature of tuning the work function, which is an essential metric for band energy alignment between the absorber layer and the charge transport layers for charge carrier extraction and collection in PSCs. Furthermore, adopting MXenes to their respective components helps reduce the interfacial recombination resistance and provides smooth charge transfer paths, leading to enhanced conductivity and operational stability of PSCs. This review paper aims to provide an overview of the applications of MXenes as components, classified according to their roles as additives (into the perovskite absorber layer, charge transport layers, and electrodes) and themselves alone or as interfacial layers, and their significant importance in PSCs in terms of device performance and stability. Lastly, we discuss the present research status and future directions toward its use in PSCs.
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Affiliation(s)
- Srikanta Palei
- Department of Chemistry, Inha University, 100 Inharo, Incheon, 22212, South Korea
| | - G Murali
- Department of Polymer Science and Engineering, Department of IT-Energy Convergence (BK21 Four), Chemical Industry Institute, Korea National University of Transportation, Chungju, 27469, South Korea
| | - Choong-Hee Kim
- Department of Chemistry, Inha University, 100 Inharo, Incheon, 22212, South Korea
| | - Insik In
- Department of Polymer Science and Engineering, Department of IT-Energy Convergence (BK21 Four), Chemical Industry Institute, Korea National University of Transportation, Chungju, 27469, South Korea.
| | - Seul-Yi Lee
- Department of Chemistry, Inha University, 100 Inharo, Incheon, 22212, South Korea.
| | - Soo-Jin Park
- Department of Chemistry, Inha University, 100 Inharo, Incheon, 22212, South Korea.
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Khan K, Tareen AK, Iqbal M, Ye Z, Xie Z, Mahmood A, Mahmood N, Zhang H. Recent Progress in Emerging Novel MXenes Based Materials and their Fascinating Sensing Applications. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 19:e2206147. [PMID: 36755364 DOI: 10.1002/smll.202206147] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Revised: 11/28/2022] [Indexed: 05/11/2023]
Abstract
Early transition metals based 2D carbides, nitrides and carbonitrides nanomaterials are known as MXenes, a novel and extensive new class of 2D materials family. Since the first accidently synthesis based discovery of Ti3 C2 in 2011, more than 50 additional compositions have been experimentally reported, including at least eight distinct synthesis methods and also more than 100 stoichiometries are theoretically studied. Due to its distinctive surface chemistry, graphene like shape, metallic conductivity, high hydrophilicity, outstanding mechanical and thermal properties, redox capacity and affordable with mass-produced nature, this diverse MXenes are of tremendous scientific and technological significance. In this review, first we'll come across the MXene based nanomaterials possible synthesis methods, their advantages, limitations and future suggestions, new chemistry related to their selected properties and potential sensing applications, which will help us to explain why this family is growing very fast as compared to other 2D families. Secondly, problems that help to further improve commercialization of the MXene nanomaterials based sensors are examined, and many advances in the commercializing of the MXene nanomaterials based sensors are proposed. At the end, we'll go through the current challenges, limitations and future suggestions.
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Affiliation(s)
- Karim Khan
- School of Electrical Engineering & Intelligentization, Dongguan University of Technology, Dongguan, 523808, China
- Shenzhen Nuoan Environmental & Safety Inc., Shenzhen, 518107, P. R. China
- Shenzhen Engineering Laboratory of Phosphorene and Optoelectronics, International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education, Institute of Microscale Optoelectronics, Engineering, Shenzhen University, Shenzhen, 518060, China
| | - Ayesha Khan Tareen
- School of Mechanical Engineering, Dongguan University of Technology, Dongguan, 523808, China
| | - Muhammad Iqbal
- Department of BioChemistry, Quaid-i-Azam University, Islamabad, 45320, Islamic Republic of Pakistan
| | - Zhang Ye
- School of Chemistry and Chemical Engineering, University of South China, Hengyang, Hunan, 421001, China
| | - Zhongjian Xie
- Shenzhen International Institute for Biomedical Research, Shenzhen, Guangdong, 518116, China
| | - Asif Mahmood
- School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, 2006, Australia
| | - Nasir Mahmood
- School of Science, The Royal Melbourne Institute of Technology University, Melbourne, Victoria, VIC 3001, Australia
| | - Han Zhang
- Shenzhen Engineering Laboratory of Phosphorene and Optoelectronics, International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education, Institute of Microscale Optoelectronics, Engineering, Shenzhen University, Shenzhen, 518060, China
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Ouedraogo NAN, Odunmbaku GO, Guo B, Chen S, Lin X, Shumilova T, Sun K. Oxidation of Spiro-OMeTAD in High-Efficiency Perovskite Solar Cells. ACS APPLIED MATERIALS & INTERFACES 2022; 14:34303-34327. [PMID: 35852808 DOI: 10.1021/acsami.2c06163] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
2,2',7,7'-Tetrakis(N,N-di-p-methoxyphenylamine)-9,9'-spirobifluorene (spiro-OMeTAD), as an organic small molecule material, is the most commonly employed hole transport material (HTM) in perovskite solar cells (PSCs) because of its excellent properties that result in high photovoltaic performances. However, the material still suffers from low conductivity, leading to the necessary use of dopants and oxidative processes to overcome this issue. The spiro-OMeTAD oxidation process is highlighted in this review, and the main parameters involved in the process have been studied. Furthermore, the best alternatives aiming to improve the spiro-OMeTAD electrical properties have been discussed. Lastly, this review concludes with suggestions and outlooks for further research directions.
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Affiliation(s)
- Nabonswende Aida Nadege Ouedraogo
- MOE Key Laboratory of Low-grade Energy Utilization Technologies and Systems, School of Energy & Power Engineering, Chongqing University, Chongqing 400044, China
| | - George Omololu Odunmbaku
- MOE Key Laboratory of Low-grade Energy Utilization Technologies and Systems, School of Energy & Power Engineering, Chongqing University, Chongqing 400044, China
| | - Bing Guo
- MOE Key Laboratory of Low-grade Energy Utilization Technologies and Systems, School of Energy & Power Engineering, Chongqing University, Chongqing 400044, China
| | - Shanshan Chen
- MOE Key Laboratory of Low-grade Energy Utilization Technologies and Systems, School of Energy & Power Engineering, Chongqing University, Chongqing 400044, China
| | - Xiaoxue Lin
- MOE Key Laboratory of Low-grade Energy Utilization Technologies and Systems, School of Energy & Power Engineering, Chongqing University, Chongqing 400044, China
| | - Tatyana Shumilova
- Institute of Geology, FRC Komi Science Center, Ural Branch, Russian Academy of Sciences, Syktyvkar 167982, Russia
| | - Kuan Sun
- MOE Key Laboratory of Low-grade Energy Utilization Technologies and Systems, School of Energy & Power Engineering, Chongqing University, Chongqing 400044, China
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Din MFU, Held V, Ullah S, Sousani S, Omastova M, Nadazdy V, Shaji A, Siffalovic P, Jergel M, Majkova E. A synergistic effect of the ion beam sputtered NiO xhole transport layer and MXene doping on inverted perovskite solar cells. NANOTECHNOLOGY 2022; 33:425202. [PMID: 35793614 DOI: 10.1088/1361-6528/ac7ed4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Accepted: 07/06/2022] [Indexed: 06/15/2023]
Abstract
The synergistic effect of high-quality NiOxhole transport layers (HTLs) deposited by ion beam sputtering on ITO substrates and the Ti3C2TxMXene doping of CH3NH3PbI3(MAPI) perovskite layers is investigated in order to improve the power conversion efficiency (PCE) of p-i-n perovskite solar cells (PSCs). The 18 nm thick NiOxlayers are pinhole-free and exhibit large-scale homogeneous surface morphology as revealed by the atomic force microscopy (AFM). The grazing-incidence x-ray diffraction showed a 0.75% expansion of the face-centered cubic lattice, suggesting an excess of oxygen as is typical for non-stoichiometric NiOx. The HTLs were used to fabricate the PSCs with MXene-doped MAPI layers. A PSC with undoped MAPI layer served as a control. The size of MAPI polycrystalline grains increased from 430 ± 80 nm to 620 ± 190 nm on the doping, as revealed by AFM. The 0.15 wt% MXene doping showed a 14.3% enhancement in PCE as compared to the PSC with undoped MAPI. The energy-resolved electrochemical impedance spectroscopy revealed one order of magnitude higher density of defect states in the band gap of MXene-doped MAPI layer, which eliminated beneficial effect of reduced total area of larger MAPI grain boundaries, decreasing short-circuit current. The PCE improvement is attributed to a decrease of the work function from -5.26 eV to -5.32 eV on the MXene doping, which increased open-circuit voltage and fill factor.
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Affiliation(s)
- Muhammad Faraz Ud Din
- Institute of Physics, Slovak Academy of Sciences, Dubravska Cesta 9, 845 11, Bratislava, Slovakia
| | - Vladimir Held
- Institute of Physics, Slovak Academy of Sciences, Dubravska Cesta 9, 845 11, Bratislava, Slovakia
| | - Sami Ullah
- Department of Physics, University of Balochistan, Quetta, 87300, Pakistan
| | - Shima Sousani
- Institute of Physics, Slovak Academy of Sciences, Dubravska Cesta 9, 845 11, Bratislava, Slovakia
| | - Maria Omastova
- Polymer Institute, Slovak Academy of Sciences, Dubravska Cesta 9, 845 41, Bratislava, Slovakia
| | - Vojtech Nadazdy
- Institute of Physics, Slovak Academy of Sciences, Dubravska Cesta 9, 845 11, Bratislava, Slovakia
- Centre for Advanced Materials Application, Slovak Academy of Sciences, Dubravska Cesta 9, 845 11, Bratislava, Slovakia
| | - Ashin Shaji
- Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Dubravska Cesta 9, 845 13, Bratislava, Slovakia
| | - Peter Siffalovic
- Institute of Physics, Slovak Academy of Sciences, Dubravska Cesta 9, 845 11, Bratislava, Slovakia
- Centre for Advanced Materials Application, Slovak Academy of Sciences, Dubravska Cesta 9, 845 11, Bratislava, Slovakia
| | - Matej Jergel
- Institute of Physics, Slovak Academy of Sciences, Dubravska Cesta 9, 845 11, Bratislava, Slovakia
- Centre for Advanced Materials Application, Slovak Academy of Sciences, Dubravska Cesta 9, 845 11, Bratislava, Slovakia
| | - Eva Majkova
- Institute of Physics, Slovak Academy of Sciences, Dubravska Cesta 9, 845 11, Bratislava, Slovakia
- Centre for Advanced Materials Application, Slovak Academy of Sciences, Dubravska Cesta 9, 845 11, Bratislava, Slovakia
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Gao P, Song M, Wang X, Liu Q, He S, Su Y, Qian P. Theoretical Study on the Electronic Structure and Magnetic Properties Regulation of Janus Structure of M’MCO2 2D MXenes. NANOMATERIALS 2022; 12:nano12030556. [PMID: 35159901 PMCID: PMC8838217 DOI: 10.3390/nano12030556] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/08/2022] [Revised: 01/28/2022] [Accepted: 02/02/2022] [Indexed: 12/19/2022]
Abstract
Motivated by the recent successful synthesis of Janus monolayer of transition metal (TM) dichalcogenides, MXenes with Janus structures are worthy of further study, concerning its electronic structure and magnetic properties. Here, we study the effect of different transition metal atoms on the structure stability and magnetic and electronic properties of M’MCO2 (M’ and M = V, Cr and Mn). The result shows the output magnetic moment is contributed mainly by the d orbitals of the V, Cr, and Mn atoms. The total magnetic moments of ferromagnetic (FM) configuration and antiferromagnetic (AFM) configuration are affected by coupling types. FM has a large magnetic moment output, while the total magnetic moments of AFM2’s (intralayer AFM/interlayer FM) configuration and AFM3’s (interlayer AFM/intralayer AFM) configuration are close to 0. The band gap widths of VCrCO2, VMnCO2, CrMnCO2, V2CO2, and Cr2CO2 are no more than 0.02 eV, showing metallic properties, while Mn2CO2 is a semiconductor with a 0.7071 eV band gap width. Janus MXenes can regulate the size of band gap, magnetic ground state, and output net magnetic moment. This work achieves the control of the magnetic properties of the available 2D materials, and provides theoretical guidance for the extensive design of novel Janus MXene materials.
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Affiliation(s)
- Panpan Gao
- Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing 100083, China; (P.G.); (M.S.); (X.W.); (Q.L.); (S.H.)
- School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, China
| | - Minhui Song
- Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing 100083, China; (P.G.); (M.S.); (X.W.); (Q.L.); (S.H.)
| | - Xiaoxu Wang
- Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing 100083, China; (P.G.); (M.S.); (X.W.); (Q.L.); (S.H.)
| | - Qing Liu
- Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing 100083, China; (P.G.); (M.S.); (X.W.); (Q.L.); (S.H.)
- School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, China
- Department of Physics, National University of Singapore, Singapore 117551, Singapore
| | - Shizhen He
- Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing 100083, China; (P.G.); (M.S.); (X.W.); (Q.L.); (S.H.)
| | - Ye Su
- Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing 100083, China; (P.G.); (M.S.); (X.W.); (Q.L.); (S.H.)
- Correspondence: (Y.S.); (P.Q.)
| | - Ping Qian
- Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing 100083, China; (P.G.); (M.S.); (X.W.); (Q.L.); (S.H.)
- School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, China
- Correspondence: (Y.S.); (P.Q.)
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Ali Shah SA, Sayyad MH, Sun J, Guo Z. Recent advances and emerging trends of rare-earth-ion doped spectral conversion nanomaterials in perovskite solar cells. J RARE EARTH 2021. [DOI: 10.1016/j.jre.2021.12.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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8
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Shi Z, Khaledialidusti R, Malaki M, Zhang H. MXene-Based Materials for Solar Cell Applications. NANOMATERIALS (BASEL, SWITZERLAND) 2021; 11:3170. [PMID: 34947518 PMCID: PMC8707056 DOI: 10.3390/nano11123170] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/25/2021] [Revised: 11/13/2021] [Accepted: 11/17/2021] [Indexed: 12/11/2022]
Abstract
MXenes are a class of two-dimensional nanomaterials with exceptional tailor-made properties, making them promising candidates for a wide variety of critical applications from energy systems, optics, electromagnetic interference shielding to those advanced sensors, and medical devices. Owing to its mechano-ceramic nature, MXenes have superior thermal, mechanical, and electrical properties. Recently, MXene-based materials are being extensively explored for solar cell applications wherein materials with superior sustainability, performance, and efficiency have been developed in demand to reduce the manufacturing cost of the present solar cell materials as well as enhance the productivity, efficiency, and performance of the MXene-based materials for solar energy harvesting. It is aimed in this review to study those MXenes employed in solar technologies, and in terms of the layout of the current paper, those 2D materials candidates used in solar cell applications are briefly reviewed and discussed, and then the fabrication methods are introduced. The key synthesis methods of MXenes, as well as the electrical, optical, and thermoelectric properties, are explained before those research efforts studying MXenes in solar cell materials are comprehensively discussed. It is believed that the use of MXene in solar technologies is in its infancy stage and many research efforts are yet to be performed on the current pitfalls to fill the existing voids.
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Affiliation(s)
- Zhe Shi
- School of Physics and New Energy, Xuzhou University of Technology, Xuzhou 221018, China;
| | - Rasoul Khaledialidusti
- Department of Mechanical and Industrial Engineering, Norwegian University of Science and Technology (NTNU), 7491 Trondheim, Norway;
| | - Massoud Malaki
- Department of Mechanical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran
| | - Han Zhang
- Shenzhen Engineering Laboratory of Phosphorene and Optoelectronics, Collaborative Innovation Center for Optoelectronic Science and Technology, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
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Recent development in emerging phosphorene based novel materials: Progress, challenges, prospects and their fascinating sensing applications. PROG SOLID STATE CH 2021. [DOI: 10.1016/j.progsolidstchem.2021.100336] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Alhamada TF, Azmah Hanim MA, Jung DW, Nuraini AA, Hasan WZW. A Brief Review of the Role of 2D Mxene Nanosheets toward Solar Cells Efficiency Improvement. NANOMATERIALS (BASEL, SWITZERLAND) 2021; 11:2732. [PMID: 34685175 PMCID: PMC8541472 DOI: 10.3390/nano11102732] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Revised: 10/13/2021] [Accepted: 10/14/2021] [Indexed: 12/18/2022]
Abstract
This article discusses the application of two-dimensional metal MXenes in solar cells (SCs), which has attracted a lot of interest due to their outstanding transparency, metallic electrical conductivity, and mechanical characteristics. In addition, some application examples of MXenes as an electrode, additive, and electron/hole transport layer in perovskite solar cells are described individually, with essential research issues highlighted. Firstly, it is imperative to comprehend the conversion efficiency of solar cells and the difficulties of effectively incorporating metal MXenes into the building blocks of solar cells to improve stability and operational performance. Based on the analysis of new articles, several ideas have been generated to advance the exploration of the potential of MXene in SCs. In addition, research into other relevant MXene suitable in perovskite solar cells (PSCs) is required to enhance the relevant work. Therefore, we identify new perspectives to achieve solar cell power conversion efficiency with an excellent quality-cost ratio.
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Affiliation(s)
- T. F. Alhamada
- Northern Technical University, Mosul 41001, Iraq;
- Department of Mechanical and Manufacturing Engineering, Faculty of Engineering, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia;
| | - M. A. Azmah Hanim
- Department of Mechanical and Manufacturing Engineering, Faculty of Engineering, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia;
- Advanced Engineering Materials and Composites Research Center (AEMC), Faculty of Engineering, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia
| | - D. W. Jung
- Department of Mechanical Engineering, Jeju National University, 1 Ara 1-dong, Jeju 690-756, Korea
| | - A. A. Nuraini
- Department of Mechanical and Manufacturing Engineering, Faculty of Engineering, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia;
| | - W. Z. Wan Hasan
- Department of Electrical and Electronic Engineering, Faculty of Engineering, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia;
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