Band alignment of Pb-Sn mixed triple cation perovskites for inverted solar cells with negligible hysteresis

Long Ji; Xiangzhao Zhang; Ting Zhang; Yafei Wang; Feng Wang; Zhiqin Zhong; Zhi David Chen; Zewen Xiao; Li Chen; Shibin Li

doi:10.1039/c8ta11891d

Band alignment of Pb-Sn mixed triple cation perovskites for inverted solar cells with negligible hysteresis

Long Ji, Xiangzhao Zhang, Ting Zhang, Yafei Wang, Feng Wang, Zhiqin Zhong, Zhi David Chen, Zewen Xiao, Li Chen, Shibin Li

Electrical and Computer Engineering

Research output: Contribution to journal › Article › peer-review

44 Scopus citations

Abstract

Substituting the toxic lead (Pb) in Pb halide perovskites by less harmful Sn is an attractive approach towards obtaining environment-friendly perovskite solar cells. However, complete substitution of Pb by Sn undermines the stability of perovskite materials and devices. Therefore, partial substitution of Pb by Sn has attracted much interest to balance environmental considerations and device performance. Here, we exploit the Sn ratio to optimize the band alignment in Pb-Sn mixed perovskite solar cells with an inverted structure. The band edge properties of Pb-Sn mixed triple cation perovskites (Cs/MA/FAPb_1-xSn_xX₃, X = Cl, Br, I) for efficient inverted solar cells are studied via simulation and experiment. The optimized solar cell with x = 0.336 shows the highest power conversion efficiency of 16.10% along with negligible hysteresis. We demonstrate that the devices are stable and maintain 93% of the initial PCE under ambient conditions for 30 days. These results suggest that bandgap engineering is a feasible approach to balance the efficiency and stability of Pb-Sn mixed PSCs.

Original language	English
Pages (from-to)	9154-9162
Number of pages	9
Journal	Journal of Materials Chemistry A
Volume	7
Issue number	15
DOIs	https://doi.org/10.1039/c8ta11891d
State	Published - 2019

Bibliographical note

Funding Information:
This work was supported by the National Natural Science Foundation of China under Grant No. 61421002, 61874150, 61574029, and 61471085.

Publisher Copyright:
© 2019 The Royal Society of Chemistry.

ASJC Scopus subject areas

Chemistry (all)
Renewable Energy, Sustainability and the Environment
Materials Science (all)

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title = "Band alignment of Pb-Sn mixed triple cation perovskites for inverted solar cells with negligible hysteresis",

abstract = "Substituting the toxic lead (Pb) in Pb halide perovskites by less harmful Sn is an attractive approach towards obtaining environment-friendly perovskite solar cells. However, complete substitution of Pb by Sn undermines the stability of perovskite materials and devices. Therefore, partial substitution of Pb by Sn has attracted much interest to balance environmental considerations and device performance. Here, we exploit the Sn ratio to optimize the band alignment in Pb-Sn mixed perovskite solar cells with an inverted structure. The band edge properties of Pb-Sn mixed triple cation perovskites (Cs/MA/FAPb1-xSnxX3, X = Cl, Br, I) for efficient inverted solar cells are studied via simulation and experiment. The optimized solar cell with x = 0.336 shows the highest power conversion efficiency of 16.10% along with negligible hysteresis. We demonstrate that the devices are stable and maintain 93% of the initial PCE under ambient conditions for 30 days. These results suggest that bandgap engineering is a feasible approach to balance the efficiency and stability of Pb-Sn mixed PSCs.",

author = "Long Ji and Xiangzhao Zhang and Ting Zhang and Yafei Wang and Feng Wang and Zhiqin Zhong and Chen, {Zhi David} and Zewen Xiao and Li Chen and Shibin Li",

note = "Funding Information: This work was supported by the National Natural Science Foundation of China under Grant No. 61421002, 61874150, 61574029, and 61471085. Publisher Copyright: {\textcopyright} 2019 The Royal Society of Chemistry.",

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T1 - Band alignment of Pb-Sn mixed triple cation perovskites for inverted solar cells with negligible hysteresis

AU - Ji, Long

AU - Zhang, Xiangzhao

AU - Zhang, Ting

AU - Wang, Yafei

AU - Wang, Feng

AU - Zhong, Zhiqin

AU - Chen, Zhi David

AU - Xiao, Zewen

AU - Chen, Li

AU - Li, Shibin

N1 - Funding Information: This work was supported by the National Natural Science Foundation of China under Grant No. 61421002, 61874150, 61574029, and 61471085. Publisher Copyright: © 2019 The Royal Society of Chemistry.

PY - 2019

Y1 - 2019

N2 - Substituting the toxic lead (Pb) in Pb halide perovskites by less harmful Sn is an attractive approach towards obtaining environment-friendly perovskite solar cells. However, complete substitution of Pb by Sn undermines the stability of perovskite materials and devices. Therefore, partial substitution of Pb by Sn has attracted much interest to balance environmental considerations and device performance. Here, we exploit the Sn ratio to optimize the band alignment in Pb-Sn mixed perovskite solar cells with an inverted structure. The band edge properties of Pb-Sn mixed triple cation perovskites (Cs/MA/FAPb1-xSnxX3, X = Cl, Br, I) for efficient inverted solar cells are studied via simulation and experiment. The optimized solar cell with x = 0.336 shows the highest power conversion efficiency of 16.10% along with negligible hysteresis. We demonstrate that the devices are stable and maintain 93% of the initial PCE under ambient conditions for 30 days. These results suggest that bandgap engineering is a feasible approach to balance the efficiency and stability of Pb-Sn mixed PSCs.

AB - Substituting the toxic lead (Pb) in Pb halide perovskites by less harmful Sn is an attractive approach towards obtaining environment-friendly perovskite solar cells. However, complete substitution of Pb by Sn undermines the stability of perovskite materials and devices. Therefore, partial substitution of Pb by Sn has attracted much interest to balance environmental considerations and device performance. Here, we exploit the Sn ratio to optimize the band alignment in Pb-Sn mixed perovskite solar cells with an inverted structure. The band edge properties of Pb-Sn mixed triple cation perovskites (Cs/MA/FAPb1-xSnxX3, X = Cl, Br, I) for efficient inverted solar cells are studied via simulation and experiment. The optimized solar cell with x = 0.336 shows the highest power conversion efficiency of 16.10% along with negligible hysteresis. We demonstrate that the devices are stable and maintain 93% of the initial PCE under ambient conditions for 30 days. These results suggest that bandgap engineering is a feasible approach to balance the efficiency and stability of Pb-Sn mixed PSCs.

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Band alignment of Pb-Sn mixed triple cation perovskites for inverted solar cells with negligible hysteresis

Abstract

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