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O: Fachverband Oberflächenphysik

O 7: Metal substrates: Adsorption of organic / bio molecules I

O 7.3: Talk

Monday, March 26, 2012, 11:00–11:15, A 053

Ultrathin heterostructures and mixed layers of the organic semiconductors NTCDA and PTCDA on Ag(111) — •Gregor Öhl, Carolin R. Braatz, and Peter Jakob — Philipps-Universität, Marburg, Germany

Heterostructures as well as mixed layers of the organic semiconductors PTCDA and NTCDA have been grown on Ag(111) and their thermal evolution (temperature range 80 - 550 K) investigated in situ using FT-IRAS, SPA-LEED and TDS. Specifically, the influence of the long range order within the first monolayer on the stacking and the thermal evolution of the heterolayers will be discussed. The high spectral resolution of IRAS thereby allows a clear discrimination of the two molecular species and of the various phases of the layered NTCDA/PTCDA system. Effects such as orientational changes, lateral ordering, dewetting and interlayer exchange become accessible this way. Depending on the stacking order of the PTCDA and NTCDA layers and on the amount of deposited material, the relevance of the individual processes is found to vary substantially. For the mixed PTCDA/NTCDA monolayers on Ag(111), results on the thermal evolution are presented.