期刊
APL MATERIALS
卷 2, 期 8, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4889844
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资金
- NTU start-up Grant [M4080514, M4080474, M4081293]
- SPMS collaborative Research Award [M4080536]
- Ministry of Education (MOE) Academic Research Fund (AcRF) Tier 1 Grant [M4010808]
- Ministry of Education (MOE) Academic Research Fund (AcRF) Tier 2 Grant [M4020176]
- NTU New Initiative Fund
- Singapore National Research Foundation through the Singapore-Berkeley Research Initiative for Sustainable Energy (SinBerRISE) CREATE Programme
The energy level alignment at the CH3NH3PbI3/copper phthalocyanine (CuPc) interface is investigated by X-ray photoelectron spectroscopy (XPS) and ultraviolet photoelectron spectroscopy (UPS). XPS reveal a 0.3 eV downward band bending in the CuPc film. UPS validate this finding and further reveal negligible interfacial dipole formation - verifying the viability of vacuum level alignment. The highest occupied molecular orbital of CuPc is found to be closer to the Fermi level than the valance band maximum of CH3NH3PbI3, facilitating hole transfer from CH3NH3PbI3 to CuPc. However, subsequent hole extraction from CuPc may be impeded by the downward band bending in the CuPc layer. (C) 2014 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.
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