文献类型：期刊文献

英文题名：Formation Mechanism of Freestanding CH3NH3PbI3 Functional Crystals: In Situ Transformation vs Dissolution-Crystallization

作者：Yang, Shuang[1];Zheng, Yi Chu[1];Hou, Yu[1];Chen, Xiao[1];Chen, Ying[1];Wang, Yun[2];Zhao, Huijun[2];Yang, Hua Gui[1,2]

机构：[1]E China Univ Sci & Technol, Sch Mat Sci & Engn, Minist Educ, Key Lab Ultrafine Mat, Shanghai 200237, Peoples R China;[2]Griffith Univ, Ctr Clean Environm & Energy, Southport, Qld 4222, Australia

年份：2014

卷号：26

期号：23

起止页码：6705

外文期刊名：CHEMISTRY OF MATERIALS

收录：;EI(收录号：20145100328798);WOS:【SCI-EXPANDED(收录号:WOS:000346326300006)】；

基金：This work was financially supported by National Natural Science Foundation of China (21373083, 21203061), SRF for ROCS, SEM, SRFDP, Programme for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning, Fundamental Research Funds for the Central Universities (WD1313009, WD1214036), and China Postdoctoral Science Foundation (2012M511056, 2013T60425).

语种：英文

外文关键词：Crystal growth - Perovskite - Dissolution - Reaction kinetics

摘要：To date, the formation mechanism of organolead halide CH3NH3PbI3 perovskites based on the efficient sequential reaction route has remained virtually unexplored. Such a synthetic method usually yields high-performance solar cells with an efficiency over 15%, and the identification of the crystal growth mechanism is crucial for understanding the chemical reaction process and further improving the light converting efficiency. Herein, we develop a versatile and facile approach based on sequential reaction to produce freestanding CH3NH3PbI3 crystals as a model for crystal growth mechanism studies. It was found that the in situ transformation and dissolutioncrystallization mechanisms play competing roles in determining the characteristics of products that are largely depend on the chemical reaction kinetics. Such a method can also be readily used for synthesis of freestanding CH3NH3PbI3 crystals with controllable morphological characteristics, such as cuboids, rods, wires, and plates. The synthetic strategy as well as the crystal growth mechanisms exemplified here can also serve in the design and development of more sophisticated organolead halide perovskites as well as further optimization across a range of possible domains of applications.