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High‐Quality Additive‐Free α‐FAPbI 3 Film Fabricated by Alkane/Nanocrystals Method and Surface Chemistry Modulation for Efficient Perovskite Solar Cell
Author(s) -
Wang Jiafeng,
Xiu Jinwei,
Zheng Guanhaojie,
He Dong,
Gao Han,
Chen Zhenhua,
Li Zhaoning,
Chen Guocong,
Zhang Xusheng,
Ma Guoqiang,
Slater Peter Raymond,
He Zhubing
Publication year - 2025
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202402024
Subject(s) - nanocrystal , materials science , perovskite (structure) , solar cell , alkane , surface (topology) , modulation (music) , perovskite solar cell , nanotechnology , chemical engineering , quality (philosophy) , optoelectronics , organic chemistry , hydrocarbon , chemistry , philosophy , geometry , mathematics , epistemology , engineering , aesthetics
Abstract It's still a scientific issue to synthesize exotic amines‐free and pure‐phase FAPbI 3 film because most FAPbI 3 films are synthesized by adding MACl‐like exotic amines salts in their precursor solution to reduce the phase transition barrier. In this work, high‐quality and additive‐free phase‐pure α‐FAPbI 3 films are successfully fabricated via the sustainable Alkane/Nanocrystals method. FAPbI 3 nanocrystals (NCs) are performed as the heterogeneous nuclei to promote the nucleation and crystallization of FAPbI 3 films. Cryogenic‐TEM and in situ GIWAXS evidence the seed function and interesting phase evolution of FAPbI 3 NCs. The whole phase transition course of pure FAPbI 3 film is systematically studied. IR‐AFM and ToF‐SIMS reveal ligands capped on NCs are extruded to the film surface. PbAc‐IPA solution treating the film surface can effectively wash off the surplus ligands at the surface and modulate the surface chemistry and energy levels. As a result, an average power conversion efficiency (PCE) of 21.45% is achieved for MA‐free pure α‐FAPbI 3 perovskite solar cells (PSCs), as well as the best light‐soaking stability record of retaining 95% of the initial PCE after 800 h. This work paves a new way to fabricate MA‐free pure α‐FAPbI 3 PSCs.