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Enhanced Sb<sub>2</sub>Se<sub>3</sub>solar cell performance through theory-guided defect control

Xinsheng LiuKey Laboratory for Special Functional Materials of Ministry of Education, Collaborative Innovation Center of Nano Functional Materials and Applications, Henan Province; Henan University; Kaifeng 475004 ChinaXun XiaoWuhan National Laboratory for Optoelectronics (WNLO); Huazhong University of Science and Technology; 1037 Luoyu Road Wuhan 430074 ChinaYe YangChemistry and Nanoscience Center; National Renewable Energy Laboratory; Golden CO 80401 USADing‐Jiang XueWuhan National Laboratory for Optoelectronics (WNLO); Huazhong University of Science and Technology; 1037 Luoyu Road Wuhan 430074 ChinaDeng‐Bing LiWuhan National Laboratory for Optoelectronics (WNLO); Huazhong University of Science and Technology; 1037 Luoyu Road Wuhan 430074 ChinaChao ChenWuhan National Laboratory for Optoelectronics (WNLO); Huazhong University of Science and Technology; 1037 Luoyu Road Wuhan 430074 ChinaShuaicheng LuWuhan National Laboratory for Optoelectronics (WNLO); Huazhong University of Science and Technology; 1037 Luoyu Road Wuhan 430074 ChinaLiang GaoWuhan National Laboratory for Optoelectronics (WNLO); Huazhong University of Science and Technology; 1037 Luoyu Road Wuhan 430074 ChinaYisu HeWuhan National Laboratory for Optoelectronics (WNLO); Huazhong University of Science and Technology; 1037 Luoyu Road Wuhan 430074 ChinaMatthew C. BeardChemistry and Nanoscience Center; National Renewable Energy Laboratory; Golden CO 80401 USAGang WangChangchun Institute of Applied Chemistry; Chinese Academy of Sciences; Changchun 130022 ChinaShiyou ChenKey Laboratory of Polar Materials and Devices (MOE); East China Normal University; Shanghai 200241 ChinaJiang TangWuhan National Laboratory for Optoelectronics (WNLO); Huazhong University of Science and Technology; 1037 Luoyu Road Wuhan 430074 China

2017en

ABI

Annotatsiya

Defects present in the absorber layer largely dictate photovoltaic device performance. Recently, a binary photovoltaic material, Sb2Se3, has drawn much attention due to its low-cost and nontoxic constituents and rapid performance promotion. So far, however, the intrinsic defects of Sb2Se3 remain elusive. Here, through a combined theoretical and experimental investigation, we revealed that shallow acceptors, SeSb antisites, are the dominant defects in Sb2Se3 produced in an Se-rich environment, where deep donors, SbSe and VSe, dominate in Sb2Se3 produced in an Se-poor environment. We further constructed a superstrate CdS/Sb2Se3 thin-film solar cell achieving 5.76% efficiency through in situ Se compensation during Sb2Se3 evaporation and through careful optimization of absorber layer thickness. The understanding of intrinsic defects in Sb2Se3 film and the demonstrated success of in situ Se compensation strategy pave the way for further efficiency improvement of this very promising photovoltaic technology. Copyright © 2017 John Wiley & Sons, Ltd.

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DOI: 10.1002/pip.2900

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