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Modification on the Unoccupied Electronic Structure of Organic Semiconductor by Alkali Metal

Published online by Cambridge University Press:  01 February 2011

Huanjun Ding ,
Kiwan Park  and
Yongli Gao
Huanjun Ding
Affiliation:
hjding@pas.rochester.edu, university of rochester, department of physics and astronomy, Baush and Lomb Hall Room 8,, department of physics and astronomy,, university of rochester, rochester, NY, 14627, United States, 585-275-8588
Kiwan Park
Affiliation:
pkiwan@pas.rochester.edu, University of Rochester, Department of Physics and Astronomy, Rochester, NY, 14627, United States
Yongli Gao
Affiliation:
ygao@pas.rochester.edu, University of Rochester, Department of Physics and Astronomy, Rochester, NY, 14627, United States
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Abstract

We have investigated the evolution of both the occupied and unoccupied states for alkali metal (Cs and Na) doped Copper-Phthalocyanine (CuPc) with photoemission and inverse photoemission spectroscopy. As the doping ratio increases, the lowest unoccupied molecular orbital (LUMO) of CuPc shifts downward, reaching the Fermi level. After the saturation, the LUMO intensity decreases monotonically, while a gap state grows in the valence spectra, which gives direct evidence for the origin of the doping-induced gap state in CuPc molecules.

Keywords

electronic structureorganicphotoemission
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1029: Symposium F – Interfaces in Organic and Molecular Electronics III , 2007 , 1029-F03-34
Copyright
Copyright © Materials Research Society 2008

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