Dresden 2009 – scientific programme

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DS: Fachverband Dünne Schichten

DS 16: Poster I

DS 16.18: Poster

Tuesday, March 24, 2009, 09:30–12:30, P5

First optical investigation of the charged states of PTCDA in solid state — •Andreas Krause, Thomas Dienel, Roman Forker, and Torsten Fritz — Institut für Angewandte Photophysik, TU-Dresden, George-Bähr-Str. 1, 01069 Dresden

Perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA) is a well known molecule, often used in research for epitaxial growth on all kinds of substrates. The arrangement of the molecules in herringbone structured crystal planes can be traced with (sub-) monolayer sensitivity by a combination of organic molecular beam epitaxy and optical in situ spectroscopy [1]. Once potassium or cesium is stepwise added to a closed monolayer of neutral PTCDA molecules, the spectral development towards PTCDA anions can be followed and assigned to the reached levels of charging. The emerging peak at 1.85 eV can be assigned to the PTCDA anion, in agreement with previous experiments without intentional doping on natural mica. However, with direct doping it is possible to identify clearly at least one further charged state, namely the PTCDA dianion.

[1] H. Proehl et al. PRL 93, 097403 (2004)