Journal
NANOSCALE
Volume 8, Issue 12, Pages 6361-6368Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5nr06217a
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Funding
- National Natural Science Foundation of China (NSFC) [U1432106]
- National Basic Research Program of China (973 Program) [2012CB932402]
- Soochow University-Western University Center for Synchrotron Radiation Research
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Collaborative Innovation Center of Suzhou Nano Science and Technology (NANO-CIC), Soochow University
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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 L-3-edge, we demonstrate that the device performance can be directly correlated to the change in the coordination environment of Pb.
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