Duan Chenghao, Zhang Kaicheng, Peng Zijian, Li Shiang, Zou Feilin, Wang Feng, Li Jiong, Zhang Zheng, Chen Chang, Zhu Qiliang, Qiu Jianhang, Lu Xinhui, Li Ning, Ding Liming, Brabec Christoph J, Gao Feng, Yan Keyou
School of Environment and Energy, State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling, South China University of Technology, Guangzhou, People's Republic of China.
Department of Physics, The Chinese University of Hong Kong, Hong Kong, People's Republic of China.
Nature. 2025 Jan;637(8048):1111-1117. doi: 10.1038/s41586-024-08432-7. Epub 2024 Nov 28.
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). Hence, inorganic perovskite tandem solar cells (IPTSCs) are promising candidates for breaking the efficiency bottleneck and addressing the stability issue, too. However, challenges remain in fabricating two-terminal (2T) IPTSCs due to the inferior film formation and deep trap states induced by tin cations. 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 CsPbSnI:LE device delivers a record efficiency of 17.41%. Combined with the 1.92 eV CsPbIBr 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.
通过用无机阳离子（例如铯）取代有机阳离子（例如甲铵和甲脒）制备的全无机钙钛矿是提高钙钛矿太阳能电池（PSC）长期光稳定性和热稳定性的有效概念。因此，无机钙钛矿串联太阳能电池（IPTSC）也是打破效率瓶颈和解决稳定性问题的有前途的候选者。然而，由于锡阳离子导致的较差的成膜性和深陷阱态，在制造两端（2T）IPTSC方面仍然存在挑战。在这里，一种使用对甲苯磺酰肼（PTSH）的配体演化（LE）策略被用于调节无机窄带隙（NBG）钙钛矿中的成膜并消除深陷阱，从而成功开发出2T IPTSC。相应地，1.31 eV的CsPbSnI:LE器件实现了17.41%的创纪录效率。与1.92 eV的CsPbIBr顶电池相结合，2T IPTSC的冠军效率为22.57%（认证值为21.92%）。此外，IPTSC经过设计，在最大功率点（MPP）跟踪下具有出色的耐久性，在65°C下1510小时和85°C下800小时能保持其初始效率的80%。我们阐明，LE策略巧妙地利用了多种作用来促进无机NBG钙钛矿的生长，并预计我们的研究为开发高效且稳定的IPTSC提供了有见地的指导方针。
