Shi Pengju, Xu Jiazhe, Yavuz Ilhan, Huang Tianyi, Tan Shaun, Zhao Ke, Zhang Xu, Tian Yuan, Wang Sisi, Fan Wei, Li Yahui, Jin Donger, Yu Xuemeng, Wang Chenyue, Gao Xingyu, Chen Zhong, Shi Enzheng, Chen Xihan, Yang Deren, Xue Jingjing, Yang Yang, Wang Rui
State Key Laboratory of Silicon Materials and School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China.
Research Center for Industries of the Future, School of Engineering, Westlake University and Institute of Advanced Technology, Westlake Institute for Advanced Study, Hangzhou, 310024, China.
Nat Commun. 2024 Mar 22;15(1):2579. doi: 10.1038/s41467-024-47019-8.
Perovskite photovoltaics, typically based on a solution-processed perovskite layer with a film thickness of a few hundred nanometres, have emerged as a leading thin-film photovoltaic technology. Nevertheless, many critical issues pose challenges to its commercialization progress, including industrial compatibility, stability, scalability and reliability. A thicker perovskite film on a scale of micrometres could mitigate these issues. However, the efficiencies of thick-film perovskite cells lag behind those with nanometre film thickness. With the mechanism remaining elusive, the community has long been under the impression that the limiting factor lies in the short carrier lifetime as a result of defects. Here, by constructing a perovskite system with extraordinarily long carrier lifetime, we rule out the restrictions of carrier lifetime on the device performance. Through this, we unveil the critical role of the ignored lattice strain in thick films. Our results provide insights into the factors limiting the performance of thick-film perovskite devices.
钙钛矿光伏电池通常基于溶液处理的钙钛矿层，其膜厚为几百纳米，已成为一种领先的薄膜光伏技术。然而，许多关键问题对其商业化进程构成挑战，包括工业兼容性、稳定性、可扩展性和可靠性。微米级的较厚钙钛矿薄膜可以缓解这些问题。然而，厚膜钙钛矿电池的效率落后于纳米膜厚的电池。由于其机制仍然难以捉摸，长期以来，业界一直认为限制因素在于缺陷导致的载流子寿命短。在这里，通过构建具有超长载流子寿命的钙钛矿体系，我们排除了载流子寿命对器件性能的限制。通过这一点，我们揭示了厚膜中被忽视的晶格应变的关键作用。我们的结果为限制厚膜钙钛矿器件性能的因素提供了见解。
