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Title: Energy level alignment at the methylammonium lead iodide/copper phthalocyanine interface
Authors: Chen, Shi
Goh, Teck Wee
Sabba, Dharani
Chua, Julianto
Mathews, Nripan
Huan, Cheng Hon Alfred
Sum, Tze Chien
Keywords: DRNTU::Science::Physics::Atomic physics::Properties of matter and antimatter
Issue Date: 2014
Source: Chen, S., Goh, T. W., Sabba, D., Chua, J., Mathews, N., Huan, C. H. A., et al. (2014). Energy level alignment at the methylammonium lead iodide/copper phthalocyanine interface. APL materials, 2(8), 081512-.
Series/Report no.: APL materials
Abstract: 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.
ISSN: 2166-532X
DOI: 10.1063/1.4889844
Schools: School of Materials Science & Engineering 
School of Physical and Mathematical Sciences 
Rights: © 2014 American Institute of Physics. This paper was published in APL Materials and is made available as an electronic reprint (preprint) with permission of American Institute of Physics. The paper can be found at the following official DOI: []. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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