Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 5, Issue 16, Pages 2863-2867Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jz501472d
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Funding
- FUNSOM, Soochow-Western Center for Synchrotron Radiation Research
- National Basic Research Program of China (973 Program) [2012CB932402]
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A comparative study of the electronic structure of methylammonium (CH3NH3) in organometallic lead triiodide perovskite (CH3NH3PbI3) thin films synthesized using either one- or two-step deposition protocols is performed using angle-resolved C K-edge soft X-ray absorption spectroscopy (XAS) and model calculations. We find that our XAS measurements can be accurately related to the ground-state unoccupied orbitals using a simple crystal field model. We further find that films made by the one-step deposition protocol exhibit angle-dependent features, indicating long-range alignment of the CH3NH3 molecules, although the angle-dependency decreases as the film thickness increases. No angle-dependency was observed in the films made via the two-step deposition method.
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