Site-dependent charge transfer at the Pt(111)-ZnPc interface and the effect of iodine

Ahmadi, Sareh, Agnarsson, Bjorn, Bidermane, Ieva, Wojek, Bastian M., Noel, Quentin, Sun, Chenghua and Gothelid, Mats (2014) Site-dependent charge transfer at the Pt(111)-ZnPc interface and the effect of iodine. Journal of Chemical Physics, 140 17: 174702-174702-13. doi:10.1063/1.4870762

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Author Ahmadi, Sareh
Agnarsson, Bjorn
Bidermane, Ieva
Wojek, Bastian M.
Noel, Quentin
Sun, Chenghua
Gothelid, Mats
Title Site-dependent charge transfer at the Pt(111)-ZnPc interface and the effect of iodine
Journal name Journal of Chemical Physics   Check publisher's open access policy
ISSN 0021-9606
Publication date 2014-05-07
Year available 2014
Sub-type Article (original research)
DOI 10.1063/1.4870762
Open Access Status File (Publisher version)
Volume 140
Issue 17
Start page 174702
End page 174702-13
Total pages 13
Place of publication College Park, MD United States
Publisher American Institute of Physics
Language eng
Subject 3100 Physics and Astronomy
1606 Political Science
Abstract 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.
Keyword Iodine
X ray photoelectron spectroscopy
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
Australian Institute for Bioengineering and Nanotechnology Publications
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