Methylammonium-free, high-efficiency, and stable all-perovskite tandem solar cells enabled by multifunctional rubidium acetate

Xufeng Liao, Xuefei Jia, Weisheng Li, Xiting Lang, Jianhua Zhang, Xinyu Zhao, Yitong Ji, Qingguo Du, Chun-Hsiao Kuan, Zhiwei Ren, Wenchao Huang, Yang Bai, Kaicheng Zhang, Chuanxiao Xiao, Qianqian Lin, Yi-Bing Cheng and Jinhui Tong ()
Additional contact information
Xufeng Liao: Wuhan University of Technology
Xuefei Jia: Wuhan University of Technology
Weisheng Li: Wuhan University of Technology
Xiting Lang: Chinese Academy of Sciences
Jianhua Zhang: Wuhan University of Technology
Xinyu Zhao: Wuhan University of Technology
Yitong Ji: Wuhan University of Technology
Qingguo Du: Wuhan University of Technology
Chun-Hsiao Kuan: and Institute of Molecular Science National Yang Ming Chiao Tung University 1001 Ta-Hseuh Rd
Zhiwei Ren: The Hong Kong Polytechnic University
Wenchao Huang: Wuhan University of Technology
Yang Bai: Shenzhen University of Advanced Technology
Kaicheng Zhang: Martensstrasse 7
Chuanxiao Xiao: Chinese Academy of Sciences
Qianqian Lin: Wuhan University
Yi-Bing Cheng: Wuhan University of Technology
Jinhui Tong: Wuhan University of Technology

Nature Communications, 2025, vol. 16, issue 1, 1-9

Abstract: Abstract All-perovskite tandem solar cells (APTSCs) offer the potential to surpass the Shockley-Queisser limit of single-junction solar cells at low cost. However, high-performance APTSCs contain unstable methylammonium (MA) cation in the tin-lead (Sn-Pb) narrow bandgap subcells. Currently, MA-free Sn-Pb perovskite solar cells (PSCs) show lower performance compared with their MA-containing counterparts. This is due to the high trap density associated with Sn2+ oxidation, which is exacerbated by the rapid crystallization of MA-free Sn-containing perovskite. Here, a multifunctional additive rubidium acetate (RbAC) is proposed to passivate Sn-Pb perovskite. We find that RbAC can suppress Sn2+ oxidation, alleviate microstrain, and improve the crystallinity of the MA-free Sn-Pb perovskite. Consequently, the resultant Sn-Pb PSCs achieve a power conversion efficiency (PCE) of 23.02%, with an open circuit voltage (Voc) of 0.897 V, and a filling factor (FF) of 80.64%, and more importantly the stability of the device is significantly improved. When further integrated with a 1.79-electron volt MA-free wide-bandgap PSC, a 29.33% (certified 28.11%) efficient MA-free APTSCs with a high Voc of 2.22 volts is achieved.

Date: 2025
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DOI: 10.1038/s41467-025-56549-8

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