Electronic structure evolution of fullerene on CH3NH3PbI3

Wang, Chenggong; Wang, Congcong; Liu, Xiaoliang; Kauppi, John; Shao, Yuchuan; Xiao, Zhengguo; Bi, Cheng; Huang, Jinsong; Gao, Yongli

doi:10.1063/1.4916079

Electronic structure evolution of fullerene on CH₃NH₃PbI₃

Journal Article · Thu Mar 19 00:00:00 EDT 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4916079· OSTI ID:1238030

Wang, Chenggong ^[1]; Wang, Congcong ^[2]; Liu, Xiaoliang ^[3]; Kauppi, John ^[2]; Shao, Yuchuan ^[4]; Xiao, Zhengguo ^[4]; Bi, Cheng ^[4]; Huang, Jinsong ^[4]; Gao, Yongli ^[2]

Univ. of Rochester, Rochester, NY (United States); University of Nebraska, Lincoln
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.

View Accepted Manuscript (DOE)

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
OSTI ID: 22395748

Journal Information:: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 11 Vol. 106; ISSN APPLAB; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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