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Boosting Efficiency and Stability of Planar Inverted (FAPbI 3 ) x (MAPbBr 3 ) 1− x Solar Cells via FAPbI 3 and MAPbBr 3 Crystal Powders
Author(s) -
Wang Jiantao,
Meng Fanxu,
Li Ruxue,
Chen Shaoqing,
Huang Xiaoyu,
Xu Jing,
Lin Xiaosong,
Chen Rui,
Wu Hongkai,
Wang Hsing-Lin
Publication year - 2020
Publication title -
solar rrl
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.544
H-Index - 37
ISSN - 2367-198X
DOI - 10.1002/solr.202000091
Subject(s) - materials science , energy conversion efficiency , crystallinity , crystallization , crystallite , perovskite (structure) , crystal (programming language) , fabrication , analytical chemistry (journal) , chemical engineering , nanotechnology , optoelectronics , crystallography , chemistry , composite material , organic chemistry , medicine , programming language , alternative medicine , pathology , computer science , engineering , metallurgy
Solution‐processed perovskite precursors, especially for MAPbBr 3 ‐assisted FAPbI 3 crystallization, has been noted to achieve high power conversion efficiency (PCE) for perovskite solar cells (PSCs). However, this low‐temperature processed (FAPbI 3 ) x (MAPbBr 3 ) 1− x typical precursor derived from commercial products (FAI, PbI 2 , MABr, and PbBr 2 ) suffers from environmental sensitivity, poor film crystallinity and less than ideal device reproducibility. Herein, (FAPbI 3 ) x (MAPbBr 3 ) 1– x (0.80 ≤ x ≤ 0.90)‐based planar inverted PSCs are fabricated, employing grinded monocrystalline MAPbBr 3 and powdered polycrystalline FAPbI 3 as precursors. The champion device with optimal molar ratio x = 0.85 comprising highly crystalline larger‐grained perovskite film with enhanced carrier transport kinetics and reduced trap‐state density exhibits boosted efficiency reaching 20.50%, which shows a 22.90% improvement over typical precursors with a PCE of 16.68%. In addition, the crystal powder precursor yields obvious film stability under ambient conditions (23 °C, 65–85% humidity) for 150 days and improved device storage stability in the glove box within two months. This protocol using stock crystal powders for perovskite precursor formulation provides a relatively facile and reproducible device fabrication route for the commercialization of PSCs.