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

Författare:
Publiceringsår: 2009
Språk: Engelska
Sidor: 13765-13771
Publikation/Tidskrift/Serie: Journal of Physical Chemistry C
Volym: 113
Nummer: 31
Dokumenttyp: Artikel
Förlag: American Chemical Society

Sammanfattning

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.

Disputation

Nyckelord

  • Chemistry
  • Physics and Astronomy

Övriga

Published
Yes
  • ISSN: 1932-7447

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