Improved performance of CH3NH3PbBr3 perovskite solar cells utilizing PbI2 precursors

• DOI: 10.1016/j.cplett.2017.09.013
• Publication Date: 2017-09-07T14:05:19Z
• Authors: Yang Yang; Taiyang Zhang; Hongxiang Tian; Zhiguo Zhao; Xiaojun Qin; Junbo Wu
• Keywords: Deposition

Abstract High-quality CH3NH3PbBr3 films have been made utilizing the PbI2 precursor via a two-step sequential deposition method. The use of the PbI2 precursor has significantly improved the film quality. UV–Vis results show that the PbI2 precursor leads to moderately enhanced absorptions. XRD and SEM characterizations suggest that compact and uniform films with large grain sizes and high crystallinity can be obtained utilizing PbI2. The power conversion efficiency of the FTO/compact-TiO2/MAPbBr3/Spiro-OMeTAD/Ag device increased from 5.3% to 7.6% after changing the PbBr2 precursor to PbI2. The reaction between PbI2 and excess MABr generated MAPbBr3 through halide anion exchange.