As next-generation photovoltaic devices,methylammonium lead iodide(MAPbI3)-based organic-inorganic halide perovskite solar cells(PSCs)have received considerable attention because of their cost effective-ness and high efficiency.However,their practical applications are retarded due to severe instability under moisture,thermal and sunlight conditions,which are closely related to the insufficient perovskite film quality and high photocatalytic activity of defective TiO2 electron-transporting layer(ETL)to accelerate the perovskite decomposition.Herein,remarkably enhanced power conversion efficiency(PCE)and sta-bility of MAPbI3-based PSCs is reached through the use of a new sodium fluoride(NaF)sacrificing layer,which,introduced between the perovskite layer and ETL,is sacrificed during cell fabrication by penetrat-ing into the perovskite layer,improving the perovskite film quality,while partial NaF is incorporated into the mesoporous TiO2 ETL during NaF layer fabrication to passivate TiO2 and construct a well-matched energy level alignment.As a result,the optimized PSC generates a high PCE of 20.9％,which is 17％higher than that of the pristine cell(17.9％),and outstanding performance stability due to remarkably enhanced moisture,thermal and sunlight stability.This study highlights a simple and effective approach to boost the PCE and durability of MAPbI3-based PSCs simultaneously,accelerating the commercialization of this technology.

Huimin Xiang;Pengyun Liu;Wei Wang;Ran Ran;Wei Zhou;Zongping Shao

College of Chemical Engineering,State Key Laboratory of Materials-Oriented Chemical Engineering,Nanjing Tech University,Nanjing 210009,China;WA School of Mines:Minerals,Energy and Chemical Engineering(WASM-MECE),Curtin University,Perth,WA 6845,Australia

材料科学技术（英文版）

[1]Huimin Xiang;Pengyun Liu;Wei Wang;Ran Ran;Wei Zhou;Zongping Shao-.Sodium fluoride sacrificing layer concept enables high-efficiency and stable methylammonium lead iodide perovskite solar cells)[J].材料科学技术（英文版）,2022(18):138-146

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