Interaction of metals with an organic semiconductor: Ag and In on PTCDA |
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Authors: | S Park T U Kampen T Kachel P Bressler W Braun D R T Zahn |
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Institution: | a Professur für Halbleiterphysik, TU Chemnitz, D-09107 Chemnitz, Germany b BESSY GmbH, Albert-Einstein-Straße 15, D-12489 Berlin-Adlershof, Germany |
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Abstract: | The interaction of Ag and In with a thin film of 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA) was studied by near-edge X-ray absorption fine structure (NEXAFS). Upon Ag deposition on a PTCDA film of 20 nm thickness the relative intensities and lineshapes, as well as the angular dependence of the spectra remains unchanged, illustrating the formation of a chemically unreactive Ag/PTCDA interface. On the other hand, the adsorption of 0.3 nm In strongly decreases the intensity of the π* resonances in C and O K-edge NEXAFS spectra. This is attributed to a strong charge transfer between In and PTCDA, leading to a redistribution of the charge in the molecule. However, the absence of a strong shift or new features and negligible dependence of peak intensities corresponding to π* resonances on the In thickness indicate that the interaction between In and PTCDA is not accompanied by a covalent bond formation. |
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Keywords: | NEXAFS PTCDA In and Ag Interface interaction |
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