Electronic structure evolution of fullerene on CH3NH3PbI3
- Univ. of Rochester, Rochester, NY (United States)
- Central South Univ., Changsha (People's Republic of China)
- Univ. of Nebraska, Lincoln, NE (United States)
The thickness dependence of fullerene on CH3NH3PbI3 perovskitefilm surface has been investigated by using ultraviolet photoemission spectroscopy (UPS), X-ray photoemission spectroscopy(XPS), and inverse photoemission spectroscopy (IPES). The lowest unoccupied molecular orbital and highest occupied molecular orbital (HOMO) can be observed directly with IPES and UPS. It is observed that the HOMO level in fullerene shifts to lower binding energy. The XPS results show a strong initial shift of core levels to lower binding energy in the perovskite, which indicates that electrons transfer from the perovskitefilm to fullerene molecules. Further deposition of fullerene forms C60 solid, accompanied by the reduction of the electron transfer. As a result, the strongest electron transfer happened at 1/4 monolayer of fullerene.
- Research Organization:
- Univ. of Nebraska, Lincoln, NE (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- EE0006709
- OSTI ID:
- 1238030
- Alternate ID(s):
- OSTI ID: 1226724
- Journal Information:
- Applied Physics Letters, Vol. 106, Issue 11; ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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