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InSb-TiOPc interfaces: Band alignment, ordering and structure dependent HOMO splitting

Brena, B.; Palmgren, P.; Nilson, K.; Yu, Shun; Hennies, Franz LU ; Agnarsson, B.; Onsten, A.; Mansson, M. and Gothelid, M. (2009) In Surface Science 603(20). p.3160-3169
Abstract
Thin films of titanyl phthalocyanine (TiOPc) have been adsorbed on InSb(1 1 1) (3 x 3) and InSb(1 0 0) c(8 x 2) surfaces and studied with respect to their electronic structure using photoemission (PES), density functional theory (DFT) and scanning tunneling microscopy (STM). The interface chemical interaction is weak in both cases; no adsorbate induced surface band bending is observed and the energy level alignment across the interface is determined by the original position of the substrate Fermi level and the charge neutrality level of the molecule. Room temperature adsorption results in disordered films on both surfaces. The behaviors after annealing are different; on InSb(1 0 0) well-ordered molecular chains form along and on top of the... (More)
Thin films of titanyl phthalocyanine (TiOPc) have been adsorbed on InSb(1 1 1) (3 x 3) and InSb(1 0 0) c(8 x 2) surfaces and studied with respect to their electronic structure using photoemission (PES), density functional theory (DFT) and scanning tunneling microscopy (STM). The interface chemical interaction is weak in both cases; no adsorbate induced surface band bending is observed and the energy level alignment across the interface is determined by the original position of the substrate Fermi level and the charge neutrality level of the molecule. Room temperature adsorption results in disordered films on both surfaces. The behaviors after annealing are different; on InSb(1 0 0) well-ordered molecular chains form along and on top of the In-rows, whereas on (1 1 1) no long range order is observed. The disorder leads to intermolecular interactions between the titanyl group and neighboring benzene rings leading to a split of TiOPc HOMO (highest occupied molecular orbital) by as much as 0.8 eV. (C) 2009 Elsevier B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Scanning tunneling microscopy, Organic-inorganic semiconductor interface, InSb, Phthalocyanine, Photoelectron spectroscopy
in
Surface Science
volume
603
issue
20
pages
3160 - 3169
publisher
Elsevier
external identifiers
  • wos:000271179600019
  • scopus:70349630420
ISSN
0039-6028
DOI
10.1016/j.susc.2009.09.001
language
English
LU publication?
yes
id
43d338f9-daa3-4817-ad93-1928e950c8db (old id 1505268)
date added to LUP
2009-11-24 13:40:27
date last changed
2017-01-01 05:52:45
@article{43d338f9-daa3-4817-ad93-1928e950c8db,
  abstract     = {Thin films of titanyl phthalocyanine (TiOPc) have been adsorbed on InSb(1 1 1) (3 x 3) and InSb(1 0 0) c(8 x 2) surfaces and studied with respect to their electronic structure using photoemission (PES), density functional theory (DFT) and scanning tunneling microscopy (STM). The interface chemical interaction is weak in both cases; no adsorbate induced surface band bending is observed and the energy level alignment across the interface is determined by the original position of the substrate Fermi level and the charge neutrality level of the molecule. Room temperature adsorption results in disordered films on both surfaces. The behaviors after annealing are different; on InSb(1 0 0) well-ordered molecular chains form along and on top of the In-rows, whereas on (1 1 1) no long range order is observed. The disorder leads to intermolecular interactions between the titanyl group and neighboring benzene rings leading to a split of TiOPc HOMO (highest occupied molecular orbital) by as much as 0.8 eV. (C) 2009 Elsevier B.V. All rights reserved.},
  author       = {Brena, B. and Palmgren, P. and Nilson, K. and Yu, Shun and Hennies, Franz and Agnarsson, B. and Onsten, A. and Mansson, M. and Gothelid, M.},
  issn         = {0039-6028},
  keyword      = {Scanning tunneling microscopy,Organic-inorganic semiconductor interface,InSb,Phthalocyanine,Photoelectron spectroscopy},
  language     = {eng},
  number       = {20},
  pages        = {3160--3169},
  publisher    = {Elsevier},
  series       = {Surface Science},
  title        = {InSb-TiOPc interfaces: Band alignment, ordering and structure dependent HOMO splitting},
  url          = {http://dx.doi.org/10.1016/j.susc.2009.09.001},
  volume       = {603},
  year         = {2009},
}