文献类型：期刊文献

英文题名：Water assisted formation of highly oriented CsPbI2Br perovskite films with the solar cell efficiency exceeding 16%

作者：Lin, Ze Qing[1];Qiao, Hong Wei[1];Zhou, Zi Ren[1];Hou, Yu[1];Li, Xiaolong[2];Yang, Hua Gui[1];Yang, Shuang[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Minist Educ, Key Lab Ultrafine Mat, Shanghai 200237, Peoples R China;[2]Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai Synchrotron Radiat Facil, Shanghai 201204, Peoples R China

年份：2020

卷号：8

期号：34

起止页码：17670

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY A

收录：;EI(收录号：20203809184613);WOS:【SCI-EXPANDED(收录号:WOS:000566092600029)】；

基金：This work was financially supported by the National Natural Science Funds for Distinguished Young Scholar (51725201), National Natural Science Foundation of China (51972111, 51902185, and 51602103), Young Elite Scientists Sponsorship Program by CAST (2017QNRC001), International (Regional) Cooperation and Exchange Projects of the National Natural Science Foundation of China (51920105003), Innovation Program of Shanghai Municipal Education Commission (E00014), Fundamental Research Funds for the Central Universities (JKD012016025, and JKD012016022) and Shanghai Engineering Research Center of Hierarchical Nanomaterials (18DZ2252400). The authors thank beamline BL14B1 at the Shanghai Synchrotron Radiation Facility (SSRF) for providing the beam time.

语种：英文

外文关键词：Perovskite solar cells - Perovskite - Bromine compounds - Efficiency - Lead compounds

摘要：Cesium lead halide perovskites are promising alternatives as light-absorbing materials for achieving perovskite solar cells with excellent thermal stability, but their inferior power conversion efficiency (PCE) and ambient instability are impeding their application. In this work, we show that liquid water can assist the formation of CsPbI2Br perovskites under the synergetic adsorption of H2O and dimethylsulfoxide (DMSO), which enabled uniform, [100] oriented CsPbI2Br films with a grain size up to 4.4 mu m. It was found that a suitable amount of H2O helps desorb the DMSO molecules, and thus favours the formation of a cubic perovskite phase from DMSO complexed intermediates. Perovskite solar cells based on our strategy delivered an optimized PCE of 16.47% with a high open-voltage of 1.33 V, as well as good device stability against humidity, light and heat.