Quantification of light-enhanced ionic transport in lead iodide perovskite thin films and its solar cell applications  

作　　者：Yi-Cheng Zhao Wen-Ke Zhou Xu Zhou Kai-Hui Liu Da-Peng Yu Qing Zhao 

机构地区：[1]State Key Laboratory for Mesoscopic Physics and Electron Microscopy Laboratory,School of Physics,Peking University,Beijing 100871,China [2]Collaborative Innovation Center of Quantum Matter,Beijing 100084,China

出　　处：《Light(Science & Applications)》2016年第1期120-127,共8页光（科学与应用)（英文版）

基　　金：supported by the National 973 Project(2013CB932602,MOST);the Ministry of Science and Technology of China and the National Natural Science Foundation of China(NSFC51272007,61571015,11327902,11234001,91433102 and 51522201);the Beijing Nova Program(XX2013003);the Program for New Century Excellent Talents in University of China.

摘　　要：Ionic transport in organometal halide perovskites is of vital importance because it dominates anomalous phenomena in perovskite solar cells,from hysteresis to switchable photovoltaic effects.However,excited state ionic transport under illumination has remained elusive,although it is essential for understanding the unusual light-induced effects(light-induced self-poling,photo-induced halide segregation and slow photoconductivity response)in organometal halide perovskites for optoelectronic applications.Here,we quantitatively demonstrate light-enhanced ionic transport in CH3NH3PbI3 over a wide temperature range of 17–295 K,which reveals a reduction in ionic transport activation energy by approximately a factor of five(from 0.82 to 0.15 eV)under illumination.The pure ionic conductance is obtained by separating it from the electronic contribution in cryogenic galvanostatic and voltage-current measurements.On the basis of these findings,we design a novel light-assisted method of catalyzing ionic interdiffusion between CH3NH3I and PbI2 stacking layers in sequential deposition perovskite synthesis.X-ray diffraction patterns indicate a significant reduction of PbI2 residue in the optimized CH3NH3PbI3 thin film produced via lightassisted sequential deposition,and the resulting solar cell efficiency is increased by over 100%(7.5%–15.7%)with little PbI2 residue.This new method enables fine control of the reaction depth in perovskite synthesis and,in turn,supports light-enhanced ionic transport.

关 键 词：activation energy ion migration LIGHT PEROVSKITE 

分 类 号：O61[理学—无机化学]