The influence of the I/Cl ratio on the performance of CH3NH3PbI3−xClx-based solar cells: why is CH3NH3I : PbCl2 = 3 : 1 the "magic" ratio?. Issue 12 (8th December 2015)

• Record Type: Journal Article
• Authors: McLeod, John A.; Wu, Zhongwei; Sun, Baoquan; Liu, Lijia
• Is Part Of: Nanoscale. Volume 8:Issue 12(2016)
• Page Start: 6361
• Page End: 6368
• Publication Date: 2015-12-08
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c5nr06217a
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : Different PbCl2 : CH3 NH3 I ratios lead to the change of halide vacancies in CH3 NH3 PbI3− x Cl x as evidenced by the X-ray absorption fine structure. Abstract : Methylammonium lead trihalide (CH3 NH3 PbI3− x Cl x ) perovskites are usually synthesized from two precursors, CH3 NH3 I 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.