期刊
MRS COMMUNICATIONS
卷 12, 期 4, 页码 460-464出版社
SPRINGER HEIDELBERG
DOI: 10.1557/s43579-022-00208-2
关键词
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资金
- National Natural Science Foundation of China [22150610468]
- 111 Project of the Chinese State Administration of Foreign Experts Affairs
- Suzhou Key Laboratory of Functional Nano Soft Materials
- Collaborative Innovation Centre of Suzhou Nano Science & Technology (NANO-CIC)
In this study, it is confirmed through experiments and analysis that CH3 typically binds to Pb in MAPbBr(3) films, forming CH3-Pb species.
Methylammonium lead halide perovskite (MAPbX(3)) has been a great candidate for photovoltaic applications. However, dissociation of the methylammonium unit has been observed, producing a CH3- group binding to MAPbX(3) and a free NH3 molecule. To date, there is no clear evidence on the specific binding site of CH3-. In this study, MAPbBr(3) thin films are prepared with deliberately added trimethyl lead bromide, (CH3)(3)PbBr. X-ray photoelectron spectroscopy is applied to comparatively investigate the electronic structure of MAPbBr(3) films with and without (CH3)(3)PbBr modification. CH3-Pb species are identified, confirming that Pb is a binding site for CH3 produced upon MA dissociation.
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