CH_3NH_3PbI_xCl_((3-x)) thin film prepared by vapor transfer method for perovskite solar cells

摘要

While exhibiting favourable photoelectric properties, I/Cl mix halide (CH3NH3PbIxCl(3-x)) perovskite absorbers are usually deficient (or even devoid) in Cl according to many characterizations including XRD and EDS. Herein, a Vapor Transfer Method (VTM), providing an isolated reaction environment to reduce the potential loss of Cl, was applied to fabricate both CH3NH3PbI3 and CH3NH3PbIxCl(3-x) perovskite solar cells to figure out how Cl exist in CH3NH3PbIxCl(3-x). Perovskite films with smooth surfaces with good surface coverage were obtained, and the existence of Cl and CH3NH3PbI3/CH3NH3PbCl3 mixed crystals were verified in CH3NH3PbIxCl(3-x) films. We also found that CH3NH3PbIxCl(3-x) films have better surface coverage, better size uniformity and higher power conversion efficiency (PCE) of 9.92%. This research provided an approach linked the existence of Cl and the performance of CH3NH3PbIxCl(3-x) absorber films together. (C) 2018 Elsevier B.V. All rights reserved.