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Proceedings Paper

Interaction of metals with perylene derivatives as a model system for contact formation in OFET structures
Author(s): Beynor A. Paez; Georgeta Salvan; Reinhard Scholz; Thorsten U. Kampen; Dietrich R. T. Zahn
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Paper Abstract

The understanding of metal/organic interfaces is fundamental for achieving high quality contacts in organic based field effect transistors,OFETs. Here the formation of In and Ag interfaces on 3,4,9,10 perylene tetracarboxylic dianhydride (PTCDA)and N,N dimethy l3,4,9,10 perylene tetracarboximide (DiMe-PTCDI)is investigated by in situ Raman spectroscopy. Upon metal deposition a significant enhancement of the Raman signals arising from internal vibrational modes is observed for these two perylene derivatives,clearly indicating the presence of surface enhanced Raman scattering (SERS). Molecules in direct contact with the metal are involved in a weak dynamical charge transfer in the electronic ground state, resulting in a breakdown of the Raman selection rules for the free molecule. Both metals show very weak interactions with the organic thin films. This finding is opposite to previous suggestions of covalent bond formation between In and O atoms in PTCDA. The Raman scattering of molecules close to the metal interface is enhanced by coupling to the plasmon resonance of small metal clusters,indicating a high roughness of the metallic film. The enhancement factors can be used to extract information on diffusion of the metal atoms into the organic film and on the morphology of the contact layer.

Paper Details

Date Published: 17 November 2003
PDF: 8 pages
Proc. SPIE 5217, Organic Field Effect Transistors II, (17 November 2003); doi: 10.1117/12.505905
Show Author Affiliations
Beynor A. Paez, Technische Univ. Chemnitz (Germany)
Georgeta Salvan, Technische Univ. Chemnitz (Germany)
Reinhard Scholz, Technische Univ. Chemnitz (Germany)
Thorsten U. Kampen, Technische Univ. Chemnitz (Germany)
Dietrich R. T. Zahn, Technische Univ. Chemnitz (Germany)

Published in SPIE Proceedings Vol. 5217:
Organic Field Effect Transistors II
Christos D. Dimitrakopoulos, Editor(s)

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