The investigation of an amidine-based additive in the perovskite films and solar cells  

作　　者：Guanhaojie Zheng Liang Li Ligang Wang Xingyu Gao Huanping Zhou 

机构地区：[1]Shanghai Synchrotron Radiation Facility,Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201204,China [2]Department of Materials Science and Engineering,College of Engineering,Peking University,Beijing 100871,China

出　　处：《Journal of Semiconductors》2017年第1期48-53,共6页半导体学报（英文版）

基　　金：Project supported by Young Talent Thousand Program and ENN Group

摘　　要：Here,we introduced acetamidine（C2H3N2H3,Aa）-based salt as an additive in the fabrication of perovskite（CH3NH3PW3）layer for perovskite solar cells.It was found that as an amidine-based salt,this additive successfully enhanced the crystallinity of CH3NH3PW3 and helped to form smooth and uniform films with comparable grain size and full coverage.Besides,perovskite film with additive showed a much longer carrier lifetime and an obviously enhanced open-circuit voltage in the corresponding devices,indicating that the acetamidine-based salt can reduce the carrier recombination in both the film and device.We further demonstrate a promising perovskite device based on acetamidine salt by using a configuration of ITOATiO2/Perovskite/Spiro-OMeTAD/Au under 〈 150 ℃ fabrication condition.A power conversion efficiency（PCE）of 16.54%was achieved,which is much higher than the control device without acetamidine salt.These results present a simple method for film quality optimization of perovskite to further improve photovoltaic performances of perovskite solar cells,which may also benefit the exploration of A cation in perovskite materials.Here,we introduced acetamidine（C2H3N2H3,Aa）-based salt as an additive in the fabrication of perovskite（CH3NH3PW3）layer for perovskite solar cells.It was found that as an amidine-based salt,this additive successfully enhanced the crystallinity of CH3NH3PW3 and helped to form smooth and uniform films with comparable grain size and full coverage.Besides,perovskite film with additive showed a much longer carrier lifetime and an obviously enhanced open-circuit voltage in the corresponding devices,indicating that the acetamidine-based salt can reduce the carrier recombination in both the film and device.We further demonstrate a promising perovskite device based on acetamidine salt by using a configuration of ITOATiO2/Perovskite/Spiro-OMeTAD/Au under 〈 150 ℃ fabrication condition.A power conversion efficiency（PCE）of 16.54%was achieved,which is much higher than the control device without acetamidine salt.These results present a simple method for film quality optimization of perovskite to further improve photovoltaic performances of perovskite solar cells,which may also benefit the exploration of A cation in perovskite materials.

关 键 词：acetamidine CRYSTALLINITY open-circuit voltage PEROVSKITE solar cell 

分 类 号：TM914.4[电气工程—电力电子与电力传动] O623.7[理学—有机化学]