Inactive (PbI2)2RbCl stabilizes perovskite films for efficient solar cells

Yang Zhao; Fei Ma; Zihan Qu; Shiqi Yu; Tao Shen; Hui-Xiong Deng; Xinbo Chu; Xinxin Peng; Yongbo Yuan; Xingwang Zhang; Jingbi You

doi:10.1126/science.abp8873

Inactive (PbI₂)₂RbCl stabilizes perovskite films for efficient solar cells

Science. 2022 Jul 29;377(6605):531-534. doi: 10.1126/science.abp8873. Epub 2022 Jul 28.

Authors

Yang Zhao^{1

2}, Fei Ma^{1

2}, Zihan Qu^{1

2}, Shiqi Yu^{1

2}, Tao Shen^{2

3}, Hui-Xiong Deng^{2

3}, Xinbo Chu^{1

2}, Xinxin Peng⁴, Yongbo Yuan^{4

5}, Xingwang Zhang^{1

2}, Jingbi You^{1

2}

Affiliations

¹ Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, P.R. China, 100083.
² Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, P.R. China, 100049.
³ State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, P.R. China, 100083.
⁴ Hunan Key Laboratory of Super Microstructure and Ultrafast Process, School of Physics and Electronics, Central South University, Changsha, Hunan, P.R. China, 410083.
⁵ Hunan Key Laboratory of Nanophotonics and Devices, School of Physics and Electronics, Central South University, Changsha, Hunan, P.R. China, 410083.

PMID: 35901131
DOI: 10.1126/science.abp8873

Abstract

In halide perovskite solar cells the formation of secondary-phase excess lead iodide (PbI₂) has some positive effects on power conversion efficiency (PCE) but can be detrimental to device stability and lead to large hysteresis effects in voltage sweeps. We converted PbI₂ into an inactive (PbI₂)₂RbCl compound by RbCl doping, which effectively stabilizes the perovskite phase. We obtained a certified PCE of 25.6% for FAPbI₃ (FA, formamidinium) perovskite solar cells on the basis of this strategy. Devices retained 96% of their original PCE values after 1000 hours of shelf storage and 80% after 500 hours of thermal stability testing at 85°C.

Publication types

Research Support, Non-U.S. Gov't