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

S. Ahmadi ; Björn Agnarsson (Institutionen för teknisk fysik, Biologisk fysik) ; I. Bidermane ; B. M. Wojek ; Q. Noel ; C. H. Sun ; M. Gothelid
Journal of Chemical Physics (0021-9606). Vol. 140 (2014), 17,
[Artikel, refereegranskad vetenskaplig]

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(root 3x root 3) or Pt(111)-I(root 7x root 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.



Denna post skapades 2014-07-03. Senast ändrad 2015-03-13.
CPL Pubid: 200140

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Biologisk fysik (2007-2015)

Ämnesområden

Fysik

Chalmers infrastruktur