Organic–inorganic lead halide perovskites have attracted great interest as low-cost and high efficiency solar cells. However, the excessive surface defects of perovskite crystal grains are still a crucial factor that limits further improvement in the performance of corresponding devices. Here, we introduce potassium chloride (KCl) into the precursor of a triple A-cation mixed-halide perovskite to passivate the surface defects and provide an insight into the underlying passivation mechanism of this common salt. We reveal that KCl exists on the surface of perovskite grains, suppressing the grain surface defects and modulating the energy level alignment of the perovskite solar cell (PSC). KCl added PSCs achieved a high open circuit voltage of 1.162 V compared with that of a control device (1.087 V), due to suppressed non-radiative recombination losses. Our work investigates the synergetic effect of K+ and Cl− on the enhancement of the device performance and provides an effective strategy of defect passivation toward highly efficient perovskite solar cells.
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Defect passivation of grain surface toward perovskite solar cells with a high open-circuit voltage exceeding 1.16 V
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28 July 2020
Research Article|
July 23 2020
Defect passivation of grain surface toward perovskite solar cells with a high open-circuit voltage exceeding 1.16 V
Special Collection:
Hybrid Organic-Inorganic Halide Perovskites
Nana Wang;
Nana Wang
School of Materials and Energy, University of Electronic Science and Technology of China
, Chengdu 611731, People’s Republic of China
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Yifeng Zhang;
Yifeng Zhang
School of Materials and Energy, University of Electronic Science and Technology of China
, Chengdu 611731, People’s Republic of China
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Peng Zeng;
Peng Zeng
School of Materials and Energy, University of Electronic Science and Technology of China
, Chengdu 611731, People’s Republic of China
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Yuchao Hu;
Yuchao Hu
School of Materials and Energy, University of Electronic Science and Technology of China
, Chengdu 611731, People’s Republic of China
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Faming Li;
Faming Li
School of Materials and Energy, University of Electronic Science and Technology of China
, Chengdu 611731, People’s Republic of China
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Mingzhen Liu
Mingzhen Liu
a)
School of Materials and Energy, University of Electronic Science and Technology of China
, Chengdu 611731, People’s Republic of China
a)Author to whom correspondence should be addressed: mingzhen.liu@uestc.edu.cn
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a)Author to whom correspondence should be addressed: mingzhen.liu@uestc.edu.cn
Note: This paper is part of the special collection on Hybrid Organic-Inorganic Halide Perovskites
J. Appl. Phys. 128, 044504 (2020)
Article history
Received:
April 28 2020
Accepted:
June 20 2020
Citation
Nana Wang, Yifeng Zhang, Peng Zeng, Yuchao Hu, Faming Li, Mingzhen Liu; Defect passivation of grain surface toward perovskite solar cells with a high open-circuit voltage exceeding 1.16 V. J. Appl. Phys. 28 July 2020; 128 (4): 044504. https://doi.org/10.1063/5.0012141
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