Surface‐Energy‐Regulated Growth of α‐Phase Cs0.03FA0.97PbI3 for Highly Efficient and Stable Inverted Perovskite Solar Cells. Issue 15 (4th March 2023)

• Record Type: Journal Article
• Authors: Pan, Ting; Zhou, Wei; Wei, Qi; Peng, Zijian; Wang, Hao; Jiang, Xianyuan; Zang, Zihao; Li, Hansheng; Yu, Danni; Zhou, Qilin; Pan, Mengling; Zhou, Wenjia; Ning, Zhijun
• Is Part Of: Advanced materials. Volume 35:Issue 15(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2023-03-04
• Subjects: crystal growth -- inverted perovskite solar cells -- metal halide perovskites -- surface energy; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.202208522
• Languages: English
• ISSNs: 0935-9648

Abstract

Abstract: Methylammonium (MA)‐free formamidinium (FA)‐dominated Cs x FA1− x PbI3 is rising as the most promising candidate for highly efficient and stable perovskite solar cells. However, the growth of high‐quality Cs x FA1− x PbI3 black‐phase perovskite structure without ion doping in the lattice remains a challenge. Herein, propeller‐shaped halogenated tertiary ammonium is synthesized, showing high binding energy on the perovskite surface and large steric hindrance. This molecule can significantly reduce the barrier of high surface energy that suppresses the growth of the α‐phase Cs x FA1− x PbI3 structure. As a result, the α‐phase structure can be formed at room temperature, which can further act as a seed for the growth of high‐quality film. Solar cells based on the film show a record efficiency up to 23.6% for MA free Cs x FA1− x PbI3 solar cells with inverted structure and excellent stability at 85 °C over 200 h. Abstract : Halogenated propeller‐shaped ammonium is synthesized and applied to reduce the surface energy and prompt the formation of the α‐phase Cs x FA1− x PbI3 perovskite structure, which generates a record efficiency of 23.6% for Cs x FA1− x PbI3 ‐based inverted structural perovskite solar cells with excellent stability.