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The effect of molybdenum trioxide inter-layer between indium tin oxide (ITO) and organic semiconductor on the energy level alignment

Published online by Cambridge University Press:  31 January 2011

Irfan Irfan ,
Huanjun Ding ,
Yongli Gao ,
Do Yang Kim ,
Jegadesan Subbiah  and
Franky So
Irfan Irfan
Affiliation:
irfan4phy@gmail.comirfan2@pas.rochester.edu, University of Rochester, Physics and Astronomy, Rochester, New York, United States
Huanjun Ding
Affiliation:
hjding@pas.rochester.edu, University of Rochester, Physics and Astronomy, Rochester, New York, United States
Yongli Gao
Affiliation:
ygao@pas.rochester.edu, University of Rochester, Physics and Astronomy, Rochester, New York, United States
Do Yang Kim
Affiliation:
dykim911@ufl.edu, University of Florida, Material Science and Engineering, gainesville, Florida, United States
Jegadesan Subbiah
Affiliation:
sjegan@ufl.edu, University of Florida, Material Science and Engineering, Gainesville, Florida, United States
Franky So
Affiliation:
fso@mse.ufl.edu, University of Florida, Material Science and Engineering, Gainesville, Florida, United States
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Abstract

We investigated 0 to 300 Å thick stepped molybdenum trioxide (MoO3) inter-layer between in-situ oxygen plasma treated conducting indium tin oxide (ITO) and chloro-aluminum pthalocyanine (AlPc-Cl) layer-by-layer evaporated up to 228 Å, with ultra-violet photoemission spectroscopy (UPS) and inverse photoemission spectroscopy (IPES). The MoO3 inter-layers were observed to increase the surface workfunction. The workfunction increase was observed to saturate at 20 Å of MoO3 coverage. The increased surface workfunction causes hole accumulation and band bending in the subsequently deposited AlPc-Cl. A possible explanation of reduction in series resistance by the insertion of the MoO3 insulating layer is discussed based on these observations and energy level alignment.

Keywords

photovoltaicelectronic structurephotoemission
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1212: Symposium S – Organic Materials and Devices for Sustainable Energy Systems , 2009 , 1212-S08-05
Copyright
Copyright © Materials Research Society 2010

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