北京大学周欢萍研究团队报道了碘插层非合金α-相甲脒型三碘化铅太阳能电池。相关研究成果于2025年1月17日发表在《科学》。

三碘化甲脒铅（FAPbI₃）被认为是高性能单结太阳能电池最有前景的成分。然而，非合金α-FAPbI₃相对于光惰性δ相是亚稳态的。

研究人员开发了一种动力学调制策略，在共沸挥发性碘插层和脱钙的辅助下，制备高质量、稳定的非合金α-FAPbI₃薄膜。碘的嵌入促进了角共享Pb-I框架构建块的形成，并降低了α-FAPbI₃形成的动力学势垒，而碘的脱钙提高了最终钙钛矿薄膜在成分纯度和整体均匀性方面的质量。

基于这种非合金α-FAPbI₃（不含其他外来成分离子）的太阳能电池实现了>24%的功率转换效率。这些器件还表现出优异的耐用性，在85°±5°C的光照下运行1100多个小时后，仍能保持99%的原始功率转换效率。

附：英文原文

Title: Nonalloyed α-phase formamidinium lead triiodide solar cells through iodine intercalation

Author: Yu Zhang, Yanrun Chen, Guilin Liu, Yuetong Wu, Zhenyu Guo, Rundong Fan, Kailin Li, Huifen Liu, Yepin Zhao, Tim Kodalle, Yihua Chen, Cheng Zhu, Yang Bai, Qi Chen, Huanping Zhou

Issue&Volume: 2025-01-17

Abstract: Formamidinium lead triiodide (FAPbI3) is considered the most promising composition for high-performing single-junction solar cells. However, nonalloyed α-FAPbI3 is metastable with respect to the photoinactive δ-phase. We have developed a kinetic modulation strategy to fabricate high-quality and stable nonalloyed α-FAPbI3 films, assisted by cogenetic volatile iodine intercalation and decalation. The intercalation of iodine facilitated the formation of corner-sharing Pb-I framework building blocks and reduced the kinetic barrier for α-FAPbI3 formation, whereas the iodine decalation improved the final perovskite film quality in terms of composition purity and overall homogeneity. Solar cells based on this nonalloyed α-FAPbI3 (free of other extrinsic composition ions) achieved a power conversion efficiency of >24%. The devices also exhibited excellent durability, retaining 99% of their original power conversion efficiency after operating for more than 1100 hours at 85° ± 5°C under illumination.

DOI: ads8968

Source:https://www.science.org/doi/10.1126/science.ads8968