Photocurrent hysteresis related to ion motion in metal-organic perovskites  

作　　者：Xiaobao Xu Mingkui Wang 

机构地区：[1]Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology

出　　处：《Science China Chemistry》2017年第3期396-404,共9页中国科学（化学英文版）

基　　金：supported by the China Scholarship Council(201506165038);the National Natural Science Foundation of China(21673091);the Natural Science Foundation of Hubei Province (ZRZ2015000203);Technology Creative Project of Excellent Middle & Young Team of Hubei Province(T201511);the Director Fund of the WNLO, the Wuhan National High Magnetic Field Center(2015KF18)

摘　　要：Perovskite solar cells have attracted considerable attention in the photovoltaic field for their high efficiency achieved in a short period of time.However,hystersis behaviour was often observed during the photocurrent-voltage measurement causes uncertainty in evaluation of photovoltaic efficiency.In this letter,we report a systematic investigation on the cause of hysteresis via series of TiO_2 based planar heterojunction structured perovskite solar cell devices.The results reveal organic cation ions,such as the commonly employed CH_3NH_3^+ or HC(NH_2)_2^+,play critical role on the observed hysteresis effect above the 298 K via interaction with iodide.We further suggest an efficient hole/electron transport in devices can inhibit such hysteresis behavior.Our conclusion sheds light onto the underlying hysteresis mechanisms,and proposes possible solutions to overcome the issue,which offers guidelines for future development of perovskite devices.Perovskite solar cells have attracted considerable attention in the photovoltaic field for their high efficiency achieved in a short period of time.However,hystersis behaviour was often observed during the photocurrent-voltage measurement causes uncertainty in evaluation of photovoltaic efficiency.In this letter,we report a systematic investigation on the cause of hysteresis via series of TiO2 based planar heterojunction structured perovskite solar cell devices.The results reveal organic cation ions,such as the commonly employed CH3NH3^＋ or HC（NH2）2^＋,play critical role on the observed hysteresis effect above the 298 K via interaction with iodide.We further suggest an efficient hole/electron transport in devices can inhibit such hysteresis behavior.Our conclusion sheds light onto the underlying hysteresis mechanisms,and proposes possible solutions to overcome the issue,which offers guidelines for future development of perovskite devices.

关 键 词：PEROVSKITE solar cell HYSTERESIS trap/de-trap ionic motion 

分 类 号：TM914.4[电气工程—电力电子与电力传动]