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Strong interactions in dye-sensitized interfaces

Palmgren, P. ; Nilson, K. ; Yu, S. ; Hennies, Franz LU ; Angot, T. ; Nlebedim, C. I. ; Layet, J. -M. ; Le Lay, G. and Goethlid, M. (2008) In Journal of Physical Chemistry C 112(15). p.5972-5977
Abstract
Phthalocyanines (Pcs) are capable of converting sunlight into electric energy when adsorbed on TiO2 in a dye-sensitized solar cell. Of special interest in this type of cell is the energy level alignment as well as how molecules adsorb on the surface as it determines the output of the cell. We investigated the FePc-TiO2(110) interface using scanning tunneling microscopy, synchrotron-based photoelectron spectroscopy, and X-ray absorption spectroscopy. We found a strong coupling of the first-layer FePc to the substrate resulting in an alteration of the electronic structure and charge transfer from the molecules. The FePc in the second layer is not severely affected by the bonding to the surface and has bulk-like electronic properties. The... (More)
Phthalocyanines (Pcs) are capable of converting sunlight into electric energy when adsorbed on TiO2 in a dye-sensitized solar cell. Of special interest in this type of cell is the energy level alignment as well as how molecules adsorb on the surface as it determines the output of the cell. We investigated the FePc-TiO2(110) interface using scanning tunneling microscopy, synchrotron-based photoelectron spectroscopy, and X-ray absorption spectroscopy. We found a strong coupling of the first-layer FePc to the substrate resulting in an alteration of the electronic structure and charge transfer from the molecules. The FePc in the second layer is not severely affected by the bonding to the surface and has bulk-like electronic properties. The growth of FePc thin films proceeds in a layer plus island mode, and the molecular plane is parallel to the surface. The energy level alignment at the interface is determined, and the lowest unoccupied molecular orbital is found above the conduction band minimum of the oxide substrate. (Less)
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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physical Chemistry C
volume
112
issue
15
pages
5972 - 5977
publisher
The American Chemical Society (ACS)
external identifiers
  • wos:000254883100042
  • scopus:43749099257
ISSN
1932-7447
DOI
10.1021/jp711311s
language
English
LU publication?
yes
id
fb9cccbe-3b44-4855-aed1-189d0e49b0b2 (old id 1206380)
date added to LUP
2016-04-01 11:44:26
date last changed
2022-01-26 17:34:20
@article{fb9cccbe-3b44-4855-aed1-189d0e49b0b2,
  abstract     = {{Phthalocyanines (Pcs) are capable of converting sunlight into electric energy when adsorbed on TiO2 in a dye-sensitized solar cell. Of special interest in this type of cell is the energy level alignment as well as how molecules adsorb on the surface as it determines the output of the cell. We investigated the FePc-TiO2(110) interface using scanning tunneling microscopy, synchrotron-based photoelectron spectroscopy, and X-ray absorption spectroscopy. We found a strong coupling of the first-layer FePc to the substrate resulting in an alteration of the electronic structure and charge transfer from the molecules. The FePc in the second layer is not severely affected by the bonding to the surface and has bulk-like electronic properties. The growth of FePc thin films proceeds in a layer plus island mode, and the molecular plane is parallel to the surface. The energy level alignment at the interface is determined, and the lowest unoccupied molecular orbital is found above the conduction band minimum of the oxide substrate.}},
  author       = {{Palmgren, P. and Nilson, K. and Yu, S. and Hennies, Franz and Angot, T. and Nlebedim, C. I. and Layet, J. -M. and Le Lay, G. and Goethlid, M.}},
  issn         = {{1932-7447}},
  language     = {{eng}},
  number       = {{15}},
  pages        = {{5972--5977}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{Journal of Physical Chemistry C}},
  title        = {{Strong interactions in dye-sensitized interfaces}},
  url          = {{http://dx.doi.org/10.1021/jp711311s}},
  doi          = {{10.1021/jp711311s}},
  volume       = {{112}},
  year         = {{2008}},
}