文献类型：期刊文献

英文题名：Thermal-Induced Volmer-Weber Growth Behavior for Planar Heterojunction Perovskites Solar Cells

作者：Zheng, Yi Chu[1];Yang, Shuang[1];Chen, Xiao[1];Chen, Ying[1];Hou, Yu[1];Yang, Hua Gui[1]

机构：[1]E China Univ Sci & Technol, Key Lab Ultrafine Mat, Minist Educ, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China

年份：2015

卷号：27

期号：14

起止页码：5116

外文期刊名：CHEMISTRY OF MATERIALS

收录：;EI(收录号：20153101087907);WOS:【SCI-EXPANDED(收录号:WOS:000358823000030)】；

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

语种：英文

外文关键词：Perovskite - Perovskite solar cells - Heterojunctions - Thin films

摘要：Recently, a hot casting technique was developed to prepare pinhole free perovskite thin films with millimeter-scale grains. However, its intrinsic formation mechanism has not been studied in the literature up to now. Here, we demonstrate a Volmer-Weber growth mechanism during the hot casting, a process that typically involves the formation of island shaped grains and the Mowing integration into dense perovskite films. It was found that such crystal growth was determined by the multiple effect of thermal energy and force centrifugal field. Particularly, the thermal energy can facilitate the formation of CH3NH3PbI3 and overcome the energy barriers of the precursor solutions on the substrates. The detailed morphologies of CH3NH3PbI3 films can be optimized by regulating deposition parameters including casting temperature and rotate speed. Solar cells constructed with these thin films achieve an average power conversion efficiency of 12.6 +/- 0.3% under standard AM 1.5 G conditions.