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

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

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 neg...

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Main Authors: Shi Chen, Teck Wee Goh, Dharani Sabba, Julianto Chua, Nripan Mathews, Cheng Hon Alfred Huan, Tze Chien Sum
Format: Article
Language:English
Published: AIP Publishing LLC 2014-08-01
Series:APL Materials
Online Access:http://dx.doi.org/10.1063/1.4889844
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spelling doaj-art-067da4920a6e4ebca31d19f9786e05132018-09-02T06:14:20ZengAIP Publishing LLCAPL Materials2166-532X2014-08-0128081512081512-710.1063/1.4889844006491APMEnergy level alignment at the methylammonium lead iodide/copper phthalocyanine interfaceShi Chen0Teck Wee Goh1Dharani Sabba2Julianto Chua3Nripan Mathews4Cheng Hon Alfred Huan5Tze Chien Sum6Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, SingaporeDivision of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, SingaporeEnergy Research Institute @NTU (ERI@N), Research Techno Plaza, X-Frontier Block, Level 5, 50 Nanyang Drive, Singapore 637553, SingaporeEnergy Research Institute @NTU (ERI@N), Research Techno Plaza, X-Frontier Block, Level 5, 50 Nanyang Drive, Singapore 637553, SingaporeEnergy Research Institute @NTU (ERI@N), Research Techno Plaza, X-Frontier Block, Level 5, 50 Nanyang Drive, Singapore 637553, SingaporeDivision of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, SingaporeDivision of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, SingaporeThe 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.http://dx.doi.org/10.1063/1.4889844
institution Open Data Bank
collection Open Access Journals
building Directory of Open Access Journals
language English
format Article
author Shi Chen
Teck Wee Goh
Dharani Sabba
Julianto Chua
Nripan Mathews
Cheng Hon Alfred Huan
Tze Chien Sum
spellingShingle Shi Chen
Teck Wee Goh
Dharani Sabba
Julianto Chua
Nripan Mathews
Cheng Hon Alfred Huan
Tze Chien Sum
Energy level alignment at the methylammonium lead iodide/copper phthalocyanine interface
APL Materials
author_facet Shi Chen
Teck Wee Goh
Dharani Sabba
Julianto Chua
Nripan Mathews
Cheng Hon Alfred Huan
Tze Chien Sum
author_sort Shi Chen
title Energy level alignment at the methylammonium lead iodide/copper phthalocyanine interface
title_short Energy level alignment at the methylammonium lead iodide/copper phthalocyanine interface
title_full Energy level alignment at the methylammonium lead iodide/copper phthalocyanine interface
title_fullStr Energy level alignment at the methylammonium lead iodide/copper phthalocyanine interface
title_full_unstemmed Energy level alignment at the methylammonium lead iodide/copper phthalocyanine interface
title_sort energy level alignment at the methylammonium lead iodide/copper phthalocyanine interface
publisher AIP Publishing LLC
series APL Materials
issn 2166-532X
publishDate 2014-08-01
description 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.
url http://dx.doi.org/10.1063/1.4889844
_version_ 1612655370096869376

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