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Tailoring the Interface in FAPbI 3 Planar Perovskite Solar Cells by Imidazole‐Graphene‐Quantum‐Dots
Author(s) -
Gao ZhiWen,
Wang Yong,
Liu Hui,
Sun Jiayun,
Kim Jinwook,
Li Yan,
Xu Baomin,
Choy Wallace C. H.
Publication year - 2021
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.202101438
Subject(s) - materials science , perovskite (structure) , formamidinium , quantum dot , graphene , photovoltaic system , nanotechnology , optoelectronics , grain boundary , chemical engineering , composite material , microstructure , engineering , ecology , biology
Organic–inorganic hybrid perovskites have reached an unprecedented high efficiency in photovoltaic applications, which makes the commercialization of perovskite solar cells (PSCs) possible. In the past several years, particular attention has been paid to the stability of PSC devices, which is a critical issue for becoming a practical photovoltaic technology. In particular, the interface‐induced degradation of perovskites should be the dominant factor causing poor stability. Here, imidazole bromide functionalized graphene quantum dots (I‐GQDs) are demonstrated to regulate the interface between the electron transport layer (ETL) and formamidinium lead iodide (FAPbI 3 ) perovskite layer. The incorporation of I‐GQDs not only reduces the interface defects for achieving a better energy level alignment between ETL and perovskite, but also improves the film quality of FAPbI 3 perovskite including enlarged grain size, lower trap density, and a longer carrier lifetime. Consequently, the planar FAPbI 3 PSCs with I‐GQDs regulation achieve a high efficiency of 22.37% with enhanced long‐term stability.