Chromium trioxide modified spiro-OMeTAD for highly efficient and stable planar perovskite solar cells  

作　　者：Xiaobing Wang Jihuai Wu Yuqian Yang Guodong Li Zeyu Song Xuping Liu Weihai Sun Zhang Lan Peng Gao 

机构地区：[1]Engineering Research Centre of Environment-Friendly Functional Materials,Ministry of Education/Fujian Engineering Research Centre of Green Functional Materials,Huaqiao University,Xiamen 361021,Fujian,China [2]Fujian Institute of Research on Structure Matter,Chinese Academy Science,CAS,Xiamen 361021,Fujian,China

出　　处：《Journal of Energy Chemistry》2021年第10期386-394,I0011,共10页能源化学（英文版）

基　　金：jointly supported by the National Natural Science Foundation of China(Nos.51972123,U1705256,61804058,21771066);the Promotion Program for Young and Middle-aged Teacher in Science and Technology Research of Huaqiao University(ZQN-706);the Cultivation Program for Postgraduate in Scientific Research Innovation Ability of Huaqiao University(No.19011081020)。

摘　　要：Hole transporting materials(HTMs)play an unparalleled role in heightening the stability and photovoltaic performance of perovskite solar cells(PSCs).The organic small molecule spiro-OMeTAD is frequently utilized for HTM in PSCs.However,the raw spiro-OMeTAD without dopant would be harmful to the development of highly efficient PSCs,due to its unsatisfied hole mobility and conductivity.Therefore,we introduce an inorganic dopant(chromium trioxide,CrO_(3))into the lithium-salt doped spiro-OMeTAD.Because of the exclamatory oxidizability of CrO_(3),it can accelerate the oxidation of spiro-OMeTAD and thereby enhancing the hole mobility of HTM.The introduction of CrO_(3) not only substantially decreases the density of defects,but also adjusts spiro-OMeTAD energy band,and thus effectively suppresses the hysteresis and improving stability of PSCs.In the end,we obtained a power conversion efficiency(PCE)as high as 22.6%after doping CrO_(3) in spiro-OMeTAD.The facile,low cost and outstanding photovoltaic performance render CrO_(3) an excellent dopant for HTMs in PSCs.

关 键 词：Perovskite solar cells Spiro-OMeTAD Hole transporting materials CrO_(3) 

分 类 号：TM914.4[电气工程—电力电子与电力传动] TB34[一般工业技术—材料科学与工程]