Dresden 2014 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 103: Graphene: Adsorption, intercalation, doping (organized by O)
HL 103.2: Talk
Thursday, April 3, 2014, 16:15–16:30, WIL C107
Adsorption of Pentacene on Epitaxial Graphene and BN — •Alexei Nefedov1, Wenua Zhang1,2, Hikmet Sezen1, Alexandr Fedorov3, Nikolay Verbitskiy4, Alexander Grüneis3,4, and Christof Woell1 — 1Institute of Funcional Interfaces, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany — 2NSRL, Hefei, China — 3IFW, Dresden, Germany — 4University of Vienna, Vienna, Austria
Smooth interfaces are a prerequisite for future high-performance and low-cost organic electronic devices based on small conjugated molecules. Since all important charge transport processes are confined to the first several monolayers, the quality of the first layer plays a key role on device performance. Pentacene stands out as a model molecule among organic semiconductors due to its ability to form well-ordered films showing a high field effect mobility. Moreover, the morphology of the first layer of a thin Pn film is known to be strongly influenced by the substrate termination, which further decisively affects the interfacial charge transport properties. Thus, information on the molecular orientation of pentacene in a case of (sub)monolayer coverages can provide a key information on improvement of device performance. In this study the adsorption of pentacene on a single layer of graphene or boron nitride (BN) has been investigated by means of XPS and NEXAFS spectroscopy. The experiments were performed on the HE-SGM beamline at BESSY II in Berlin. It was found that pentacene molecules demonstrate a dependence of their orientation and electronic structure on the coverage.