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Changing adsorption mode of FePc on TiO2(110) by surface modification with bipyridine

Palmgren, P.; Yu, S.; Hennies, Franz LU ; Nilson, K.; Akermark, B. and Gothelid, M. (2008) In Journal of Chemical Physics 129(7).
Abstract
Surface modification of reactive oxide substrates to obtain a less strongly interacting template for dye adsorption may be a way to enhance performance in dye-sensitized solar cells. In this work, we have investigated the electronic and structural properties of 4,4(')-bipyridine (bipy) as modifier adsorbed on the TiO2(110) surface. The modified surface is then coated with iron phthalocyanine (FePc) and the properties of this heterostructure are investigated with synchrotron based photoelectron spectroscopy, x-ray absorption spectroscopy, and scanning tunneling microscopy. We find that a saturated monolayer consisting of standing bipy molecules with one nitrogen atom pointing outward is formed on the oxide surface. FePc adsorb in molecular... (More)
Surface modification of reactive oxide substrates to obtain a less strongly interacting template for dye adsorption may be a way to enhance performance in dye-sensitized solar cells. In this work, we have investigated the electronic and structural properties of 4,4(')-bipyridine (bipy) as modifier adsorbed on the TiO2(110) surface. The modified surface is then coated with iron phthalocyanine (FePc) and the properties of this heterostructure are investigated with synchrotron based photoelectron spectroscopy, x-ray absorption spectroscopy, and scanning tunneling microscopy. We find that a saturated monolayer consisting of standing bipy molecules with one nitrogen atom pointing outward is formed on the oxide surface. FePc adsorb in molecular chains along the [001] direction on top of bipy and ordered in a tilted arrangement with adjacent molecules partially overlapping. Already from the first layer, the electronic properties of FePc resemble those of multilayer films. FePc alone is oxidized on the TiO2(110) surface, but preadsorbed bipy prevents this reaction. The energy level lineup at the interface is clarified. (C) 2008 American Institute of Physics. (Less)
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organization
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type
Contribution to journal
publication status
published
subject
in
Journal of Chemical Physics
volume
129
issue
7
publisher
American Institute of Physics
external identifiers
  • wos:000258643300041
  • scopus:50249106920
ISSN
0021-9606
DOI
10.1063/1.2969081
language
English
LU publication?
yes
id
d1763343-ee21-45ee-8444-c10d3f3e5a12 (old id 1251898)
date added to LUP
2008-11-18 15:44:18
date last changed
2017-03-19 03:28:25
@article{d1763343-ee21-45ee-8444-c10d3f3e5a12,
  abstract     = {Surface modification of reactive oxide substrates to obtain a less strongly interacting template for dye adsorption may be a way to enhance performance in dye-sensitized solar cells. In this work, we have investigated the electronic and structural properties of 4,4(')-bipyridine (bipy) as modifier adsorbed on the TiO2(110) surface. The modified surface is then coated with iron phthalocyanine (FePc) and the properties of this heterostructure are investigated with synchrotron based photoelectron spectroscopy, x-ray absorption spectroscopy, and scanning tunneling microscopy. We find that a saturated monolayer consisting of standing bipy molecules with one nitrogen atom pointing outward is formed on the oxide surface. FePc adsorb in molecular chains along the [001] direction on top of bipy and ordered in a tilted arrangement with adjacent molecules partially overlapping. Already from the first layer, the electronic properties of FePc resemble those of multilayer films. FePc alone is oxidized on the TiO2(110) surface, but preadsorbed bipy prevents this reaction. The energy level lineup at the interface is clarified. (C) 2008 American Institute of Physics.},
  articleno    = {074707},
  author       = {Palmgren, P. and Yu, S. and Hennies, Franz and Nilson, K. and Akermark, B. and Gothelid, M.},
  issn         = {0021-9606},
  language     = {eng},
  number       = {7},
  publisher    = {American Institute of Physics},
  series       = {Journal of Chemical Physics},
  title        = {Changing adsorption mode of FePc on TiO2(110) by surface modification with bipyridine},
  url          = {http://dx.doi.org/10.1063/1.2969081},
  volume       = {129},
  year         = {2008},
}