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Modification of Charge Transfer and Energy Level Alignment at Organic/TiO2 Interfaces

Yu, Shun; Ahmadi, Sarch; Palmgren, Pål LU ; Hennies, Franz LU ; Zuleta, Marcelo and Gothelid, Mats (2009) In Journal of Physical Chemistry C 113(31). p.13765-13771
Abstract
Adsorption of titanyl phthalocyanine (TiOPc) on rutile TiO2(110) modified by a set of pyridine derivatives (2,2'-bipyridine, 4,4'-bipyridine, and 4-tert-butyl pyridine) has been investigated using synchrotron radiation based X-ray photoelectron spectroscopy (XPS). For the unmodified TiOPc/TiO2 system, a strong charge transfer is observed from the first layer TiOPc into the substrate, which leads to a molecular layer at the interface with a depleted highest occupied molecular orbital (HOMO). However, precovering the TiO2 surface with a saturated pyridine monolayer effectively reduce this process and leave the TiOPc in a less perturbed molecular state. Furthermore, the TiOPc HOMO and core levels are observed at different binding energies... (More)
Adsorption of titanyl phthalocyanine (TiOPc) on rutile TiO2(110) modified by a set of pyridine derivatives (2,2'-bipyridine, 4,4'-bipyridine, and 4-tert-butyl pyridine) has been investigated using synchrotron radiation based X-ray photoelectron spectroscopy (XPS). For the unmodified TiOPc/TiO2 system, a strong charge transfer is observed from the first layer TiOPc into the substrate, which leads to a molecular layer at the interface with a depleted highest occupied molecular orbital (HOMO). However, precovering the TiO2 surface with a saturated pyridine monolayer effectively reduce this process and leave the TiOPc in a less perturbed molecular state. Furthermore, the TiOPc HOMO and core levels are observed at different binding energies ranging by 0.3 eV on the three pyridine monolayers, which is ascribed to differences in surface potentials set up by the different pyridine/TiO2 systems. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physical Chemistry C
volume
113
issue
31
pages
13765 - 13771
publisher
The American Chemical Society
external identifiers
  • wos:000268478700047
  • scopus:68749107094
ISSN
1932-7447
DOI
10.1021/jp902814d
language
English
LU publication?
yes
id
514f4986-f60c-495c-8d7b-4b62c3a84e9b (old id 1459947)
date added to LUP
2009-08-25 14:03:49
date last changed
2017-08-20 03:38:23
@article{514f4986-f60c-495c-8d7b-4b62c3a84e9b,
  abstract     = {Adsorption of titanyl phthalocyanine (TiOPc) on rutile TiO2(110) modified by a set of pyridine derivatives (2,2'-bipyridine, 4,4'-bipyridine, and 4-tert-butyl pyridine) has been investigated using synchrotron radiation based X-ray photoelectron spectroscopy (XPS). For the unmodified TiOPc/TiO2 system, a strong charge transfer is observed from the first layer TiOPc into the substrate, which leads to a molecular layer at the interface with a depleted highest occupied molecular orbital (HOMO). However, precovering the TiO2 surface with a saturated pyridine monolayer effectively reduce this process and leave the TiOPc in a less perturbed molecular state. Furthermore, the TiOPc HOMO and core levels are observed at different binding energies ranging by 0.3 eV on the three pyridine monolayers, which is ascribed to differences in surface potentials set up by the different pyridine/TiO2 systems.},
  author       = {Yu, Shun and Ahmadi, Sarch and Palmgren, Pål and Hennies, Franz and Zuleta, Marcelo and Gothelid, Mats},
  issn         = {1932-7447},
  language     = {eng},
  number       = {31},
  pages        = {13765--13771},
  publisher    = {The American Chemical Society},
  series       = {Journal of Physical Chemistry C},
  title        = {Modification of Charge Transfer and Energy Level Alignment at Organic/TiO2 Interfaces},
  url          = {http://dx.doi.org/10.1021/jp902814d},
  volume       = {113},
  year         = {2009},
}