Crystal Growth Regulation of α‐FAPbI3 Perovskite Films for High‐Efficiency Solar Cells with Long‐Term Stability

Author:

Wang Shiheng1,Luo Huaiqing1,Gu Zhenkun1,Zhao Rudai1,Guo Lutong12,Wang Na1,Lou Yunjie1,Xu Qun1,Peng Shou34,Zhang Yiqiang1ORCID,Song Yanlin2ORCID

Affiliation:

1. College of Chemistry Henan Institute of Advanced Technology Zhengzhou University Zhengzhou 450052 P. R. China

2. Key Laboratory of Green Printing Institute of Chemistry Chinese Academy of Sciences (ICCAS) Beijing Engineering Research Center of Nanomaterials for Green Printing Technology National Laboratory for Molecular Sciences (BNLMS) Beijing 100190 P. R. China

3. China National Building Material Group Co., Ltd. Beijing 100036 P. R. China

4. State Key Laboratory of Advanced Technology for Float Glass Bengbu 233000 P. R. China

Abstract

AbstractThe two‐step sequentially deposition strategy has been widely used to produce high‐performance FAPbI3‐based solar cells. However, due to the rapid reaction between PbI2 and FAI, a dense perovskite film forms on top of the PbI2 layer immediately and blocks the FAI diffusion into the bottom of the PbI2 film for a complete reaction, which results in a low‐efficiency and limited reproducibility of perovskite solar cells (PSCs). Here, high‐quality α‐FAPbI3 perovskite films by crystal growth regulation with 4‐fluorobenzamide additives is fabricated. The additives can interact with FAI to suppress the fast reaction between the FAI and PbI2 and effectively passivate the under‐coordinated Pb2+ or I defects. As a result, α‐FAPbI3 perovskite films with low trap density and large grain size are prepared. The modified PSCs present a high‐power conversion efficiency of 24.08%, maintaining 90% of their initial efficiency after 1400 h in high humidity. This study provides an efficient strategy of synergistic crystallization and passivation to form high‐quality α‐FAPbI3 films for high‐performance PSCs.

Funder

National Natural Science Foundation of China

China Postdoctoral Science Foundation

Publisher

Wiley

Subject

Electrochemistry,Condensed Matter Physics,Biomaterials,Electronic, Optical and Magnetic Materials

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