Durable all-inorganic perovskite tandem photovoltaics

Chenghao Duan, Kaicheng Zhang, Zijian Peng, Shiang Li, Feilin Zou, Feng Wang, Jiong Li, Zheng Zhang, Chang Chen, Qiliang Zhu, Jianhang Qiu, Xinhui Lu, Ning Li, Liming Ding, Christoph J. Brabec, Feng Gao and Keyou Yan ()
Additional contact information
Chenghao Duan: South China University of Technology
Kaicheng Zhang: Friedrich-Alexander University Erlangen-Nürnberg
Zijian Peng: Friedrich-Alexander University Erlangen-Nürnberg
Shiang Li: The Chinese University of Hong Kong
Feilin Zou: South China University of Technology
Feng Wang: Linköping University
Jiong Li: South China University of Technology
Zheng Zhang: South China University of Technology
Chang Chen: South China University of Technology
Qiliang Zhu: South China University of Technology
Jianhang Qiu: Chinese Academy of Sciences
Xinhui Lu: The Chinese University of Hong Kong
Ning Li: South China University of Technology
Liming Ding: National Center for Nanoscience and Technology
Christoph J. Brabec: Friedrich-Alexander University Erlangen-Nürnberg
Feng Gao: Linköping University
Keyou Yan: South China University of Technology

Nature, 2025, vol. 637, issue 8048, 1111-1117

Abstract: Abstract All-inorganic perovskites prepared by substituting the organic cations (for example, methylammonium and formamidinium) with inorganic cations (for example, Cs+) are effective concepts to enhance the long-term photostability and thermal stability of perovskite solar cells (PSCs)1,2. Hence, inorganic perovskite tandem solar cells (IPTSCs) are promising candidates for breaking the efficiency bottleneck and addressing the stability issue, too3,4. However, challenges remain in fabricating two-terminal (2T) IPTSCs due to the inferior film formation and deep trap states induced by tin cations5–7. Here a ligand evolution (LE) strategy with p-toluenesulfonyl hydrazide (PTSH) is used to regulate film formation and eliminate deep traps in inorganic narrow-bandgap (NBG) perovskites, enabling the successful development of 2T IPTSCs. Accordingly, the 1.31 eV CsPb0.4Sn0.6I3:LE device delivers a record efficiency of 17.41%. Combined with the 1.92 eV CsPbI2Br top cell, 2T IPTSCs exhibit a champion efficiency of 22.57% (certified, 21.92%). Moreover, IPTSCs are engineered to deliver remarkable durability under maximum power point (MPP) tracking, maintaining 80% of their initial efficiency at 65 °C for 1,510 h and at 85 °C for 800 h. We elucidate that LE deliberately leverages multiple roles for inorganic NBG perovskite growth and anticipate that our study provides an insightful guideline for developing high-efficiency and stable IPTSCs.

Date: 2025
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DOI: 10.1038/s41586-024-08432-7

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