Electronic and geometric structure of the PTCDA/Ag(110) interface probed by angle-resolved photoemission

Wießner, M.; Krömker, B.; Hauschild, D.; Schöll, A.; Reinert, F.; Feyer, V.; Winkler, K.

doi:10.1103/PhysRevB.86.045417

Journal Article

Electronic and geometric structure of the PTCDA/Ag(110) interface probed by angle-resolved photoemission

Wießner, M. ; Hauschild, D. ; Schöll, A. ; Reinert, F. ; Feyer, V.FZJ* ; Winkler, K. ; Krömker, B.

2012
APS College Park, Md.

Physical review / B 86(4), 045417 (2012) [10.1103/PhysRevB.86.045417]

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Please use a persistent id in citations: http://hdl.handle.net/2128/10853 doi:10.1103/PhysRevB.86.045417

Abstract: The properties of molecular films are determined by the geometric structure of the first layers near the interface. These are in contact with the substrate and feel the effect of the interfacial bonding, which particularly, for metal substrates, can be substantial. For the model system 3,4,9,10-perylenetetracarboxylic dianhydride on Ag(110), the geometric structure of the first monolayer can be modified by preparation parameters. This leads to significant differences in the electronic structure of the first layer. Here, we show that, by combining angle-resolved photoelectron spectroscopy with low-energy electron diffraction, we cannot only determine the electronic structure of the interfacial layer and the unit cell of the adsorbate superstructure, but also the arrangement of the molecules in the unit cell. Moreover, in bilayer films, we can distinguish the first from the second layer and, thus, study the formation of the second layer and its influence on the buried interface.

Keyword(s): J

Classification:

Physics, Condensed Matter

Note: We gratefully thank C. Wiemann and C. M. Schneider for their cooperation at the NanoESCA at Elettra and acknowledge Elettra for providing good quality synchrotron light. We thank P. Puschnig (Graz) for stimulating discussions. This work was financially supported by the Deutsche Forschungsgemeinschaft (Grants No. FOR 1162 and No. GRK 1221) and the Bundesministerium fur Bildung und Forschung (ContractsNo. 05K10WW2 and No. 03SF0356B).

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