Chemical vapor deposition growth of phase-selective inorganic lead halide perovskite films for sensitive photodetectors

作     者：Weilong Xu Mengsi Niu Xiaoyu Yang Haiyue Chen Xiaohong Cai Trevor A.Smith Kenneth PGhiggino Xiaotao Hao Weilong Xu;Mengsi Niu;Xiaoyu Yang;Haiyue Chen;Xiaohong Cai;Trevor A. Smith;Kenneth P. Ghiggino;Xiaotao Hao

作者机构：School of Photoelectric EngineeringChangzhou Institute of TechnologyChangzhou 213002China School of PhysicsState Key Laboratory of Crystal MaterialsShandong UniversityJi'nan 250100China ARC Centre of Excellence in Exciton ScienceSchool of ChemistryThe University of MelbourneParkvilleVictoria 3010Australia 

出 版 物：《Chinese Chemical Letters》 (中国化学快报（英文版）)

年 卷 期：2021年第32卷第1期

页      面：489-492页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 08[工学] 0703[理学-化学] 0803[工学-光学工程] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China(Nos.61804015,11574181) Natural Science Foundation of Jiangsu Province(No.BK20180181) the Natural Science Foundation of Jiangsu Higher Education(No.17KJB140001) support from the ARC Centre of Excellence in Exciton Science(No.CE170100026)。 

主　　题：Chemical vapor deposition Inorganic perovskite Phase-selective Photodetector Photophysical dynamics 

摘      要：Inorganic lead halide perovskites are attractive optoelectronic materials owing to their relative stability compared to organic cation alternatives.The chemical vapor deposition(CVD) method offers potential for high quality perovskite film growth.The deposition temperature is a critical parameter determining the film quality owing to the melting difference between the precursors.Here,perovskite films were deposited by the CVD method at various temperatures between 500-800℃.The perovskite phase converts from CsPb_(2)Br_(5) to CsPbBr_(3) gradually as the deposition temperature is increased.The grain size of the perovskite films also increases with temperature.The phase transition mechanism was clarified.The photoexcited state dynamics were investigated by spatially and temporally resolved fluorescence measurements.The perovskite film deposited under 750℃ condition is of the CsPbBr_(3) phase,showing low trap-state density and large crystalline grain size.A photodetector based on perovskite films shows high photocurrent and an on/off ratio of ~2.5×10^(4).