title: The influence of the I/Cl ratio on the performance of CH3NH3PbI(3-x)Cl(x)-based solar cells: why is CH3NH3I : PbCl2 = 3 : 1 the "magic" ratio?
abstract: Methylammonium lead trihalide (CH3NH3PbI(3-x)Cl(x)) perovskites are usually synthesized from two precursors, CH3NH3I and PbCl2 at a ratio of 3 : 1. It was found that a slight adjustment of the I/Cl ratio in the precursor mixture plays a strong effect on solar cell performance. In this study, perovskites made with different I/Cl ratios were comparatively studied. In combination with X-ray diffraction (XRD) and X-ray absorption fine structure (XAFS) measured at the Pb L3-edge, we demonstrate that the device performance can be directly correlated to the change in the coordination environment of Pb.
authors.affiliation: Jiangsu Key Laboratory for Carbon-based Materials and Devices, Institute of Functional Nano and Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu 215123, China. bqsun@suda.edu.cn ljliu@suda.edu.cn and Soochow University-Western University Centre for Synchrotron Radiation Research, Soochow University, Suzhou, Jiangsu 215123, China.
authors.forename: John A
authors.initials: JA
authors.lastname: McLeod
authors.affiliation: Jiangsu Key Laboratory for Carbon-based Materials and Devices, Institute of Functional Nano and Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu 215123, China. bqsun@suda.edu.cn ljliu@suda.edu.cn.
authors.forename: Zhongwei
authors.initials: Z
authors.lastname: Wu
authors.affiliation: Jiangsu Key Laboratory for Carbon-based Materials and Devices, Institute of Functional Nano and Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu 215123, China. bqsun@suda.edu.cn ljliu@suda.edu.cn.
authors.forename: Baoquan
authors.initials: B
authors.lastname: Sun
authors.affiliation: Jiangsu Key Laboratory for Carbon-based Materials and Devices, Institute of Functional Nano and Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu 215123, China. bqsun@suda.edu.cn ljliu@suda.edu.cn and Soochow University-Western University Centre for Synchrotron Radiation Research, Soochow University, Suzhou, Jiangsu 215123, China.
authors.forename: Lijia
authors.initials: L
authors.lastname: Liu