文献类型：期刊文献

英文题名：Formation of high-quality perovskite thin film for planar heterojunction solar cells

作者：Yang, Shuang[1];Chen, Ying[1];Zheng, Yi Chu[1];Chen, Xiao[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：5

期号：85

起止页码：69502

外文期刊名：RSC ADVANCES

收录：;EI(收录号：20153401203872);WOS:【SCI-EXPANDED(收录号:WOS:000360069900055)】；

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.

语种：英文

外文关键词：Heterojunctions - Surface roughness - Thin film solar cells - Lead compounds - Perovskite - Efficiency - Layered semiconductors - Perovskite solar cells - Thin films

摘要：Constructing uniform, flat perovskite thin films is of paramount essence to achieve high performance and reproducible perovskite photovoltaic devices. However, the sequential deposition technique, which usually shows efficiencies over 17%, still failed to enable the formation of uniform, pinhole-free films by solution processing, whereas such high-quality films can be prepared within the vapor medium. Here we demonstrate that such high-quality film can also be realized upon a solution process via judicious choice of solvents, particularly by controlling of lead dissolution phenomenon. We found that alcohol solvents with appropriate molecular structures such as tert-butanol, can facilitate the in situ intercalation of ammonium cations into PbI2 matrix, and thus give flat mirror-like tetragonal perovskite film with resemble surface roughness to that from vapor assisted method. Planar heterojunction solar cells constructed with these solution-processed thin films yielded a high power conversion efficiency of 14.61%, extremely higher than that of conventional method under standard one sun conditions. This solvent-mediated strategy provides a new approach towards the goal of high-performance, low-cost and reproducible devices with simple solution processes.