Issue 12, 2016

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?

Abstract

Methylammonium lead trihalide (CH3NH3PbI3−xClx) 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.

Graphical abstract: 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?

Article information

Article type
Paper
Submitted
09 Sept. 2015
Accepted
18 Nov. 2015
First published
19 Nov. 2015

Nanoscale, 2016,8, 6361-6368

Author version available

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?

J. A. McLeod, Z. Wu, B. Sun and L. Liu, Nanoscale, 2016, 8, 6361 DOI: 10.1039/C5NR06217A

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