Site-dependent charge transfer at the Pt(111)-ZnPc interface and the effect of iodine
- KTH Royal Institute of Technology, ICT MNF Materials Physics, Electrum 229, 16440 Kista (Sweden)
- Department of Applied Physics, Biological Physics, Chalmers University of Technology, Fysikgränd 3, 412 96 Göteborg (Sweden)
- Department of Physics and Astronomy, Uppsala University, Box 516, 75120 Uppsala (Sweden)
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, St Lucia QLD 4072 (Australia)
The electronic structure of ZnPc, from sub-monolayers to thick films, on bare and iodated Pt(111) is studied by means of X-ray photoelectron spectroscopy, X-ray absorption spectroscopy, and scanning tunneling microscopy. Our results suggest that at low coverage ZnPc lies almost parallel to the Pt(111) substrate, in a non-planar configuration induced by Zn-Pt attraction, leading to an inhomogeneous charge distribution within the molecule and an inhomogeneous charge transfer to the molecule. ZnPc does not form a complete monolayer on the Pt surface, due to a surface-mediated intermolecular repulsion. At higher coverage ZnPc adopts a tilted geometry, due to a reduced molecule-substrate interaction. Our photoemission results illustrate that ZnPc is practically decoupled from Pt, already from the second layer. Pre-deposition of iodine on Pt hinders the Zn-Pt attraction, leading to a non-distorted first layer ZnPc in contact with Pt(111)-I(√3×√3) or Pt(111)-I(√7×√7), and a more homogeneous charge distribution and charge transfer at the interface. On increased ZnPc thickness iodine is dissolved in the organic film where it acts as an electron acceptor dopant.
- OSTI ID:
- 22252964
- Journal Information:
- Journal of Chemical Physics, Vol. 140, Issue 17; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ABSORPTION SPECTROSCOPY
BINDING ENERGY
CHARGE DISTRIBUTION
DEPOSITION
ELECTRONIC STRUCTURE
ELECTRONS
FILMS
INTERACTIONS
IODINE
LAYERS
PHOTOEMISSION
SCANNING TUNNELING MICROSCOPY
SUBSTRATES
SURFACES
THICKNESS
X-RAY PHOTOELECTRON SPECTROSCOPY
X-RAY SPECTROSCOPY