Energy level alignment at the methylammonium lead iodide/copper phthalocyanine interface

Shi Chen; Teck Wee Goh; Dharani Sabba; Julianto Chua; Nripan Mathews; Cheng Hon Alfred Huan; Tze Chien Sum

doi:10.1063/1.4889844

Energy level alignment at the methylammonium lead iodide/copper phthalocyanine interface

Shi Chen, Teck Wee Goh, Dharani Sabba, Julianto Chua, Nripan Mathews, Cheng Hon Alfred Huan^*, Tze Chien Sum

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

83 Citations (Scopus)

Abstract

The energy level alignment at the CH₃NH₃PbI ₃/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.

Original language	English
Article number	081512
Journal	APL Materials
Volume	2
Issue number	8
DOIs	https://doi.org/10.1063/1.4889844
Publication status	Published - Aug 2014
Externally published	Yes

ASJC Scopus Subject Areas

General Materials Science
General Engineering

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title = "Energy level alignment at the methylammonium lead iodide/copper phthalocyanine interface",

abstract = "The energy level alignment at the CH3NH3PbI 3/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.",

author = "Shi Chen and Goh, {Teck Wee} and Dharani Sabba and Julianto Chua and Nripan Mathews and Huan, {Cheng Hon Alfred} and Sum, {Tze Chien}",

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T1 - Energy level alignment at the methylammonium lead iodide/copper phthalocyanine interface

AU - Chen, Shi

AU - Goh, Teck Wee

AU - Sabba, Dharani

AU - Chua, Julianto

AU - Mathews, Nripan

AU - Huan, Cheng Hon Alfred

AU - Sum, Tze Chien

PY - 2014/8

Y1 - 2014/8

N2 - The energy level alignment at the CH3NH3PbI 3/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.

AB - The energy level alignment at the CH3NH3PbI 3/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.

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Energy level alignment at the methylammonium lead iodide/copper phthalocyanine interface

Abstract

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