Regensburg 2013 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 69: Poster Session: II-VI semiconductors; Organic semiconductors; Heterostructures

HL 69.14: Poster

Wednesday, March 13, 2013, 16:00–20:00, Poster A

Optical Spectroscopy on planar ZnO/Pentacene Hybrids — •Ingo G. Meyenburg, Manuel Demper, Jonatan Helzel, Mira El Helou, Tobias Breuer, Gregor Witte, and Wolfram Heimbrodt — Philipps Universität Marburg department of physics and material sciences centre Germany, Renthof 5, D-35032 Marburg

In recent years organic semiconductors have attracted considerable attention because of their unique optical, electronic and mechanical properties. It has been shown, for example that inorganic organic hybrids like p-type Pentacene on ZnO are feasible to prepare p-n-junction. To study the excitonic properties of the organic layer we prepared pentacene films with thicknesses in the range between 10 nm and 100 nm on different ZnO surfaces by molecular beam deposition under ultra-high vacuum. By varying the growth temperature we obtain pentacene films in an amorphous, in the thin film and the Campbell phase which were characterized by AFM and X-ray diffraction measurements. Due to a formation of crystalline islands in the range of several micrometres in the non-amorphous phases we were able to study the absorption behavior of these single crystals by varying the temperature and the light polarization. In comparison to the pentacene molecules in solution the absorption spectra of the crystalline pentacene exhibit additional pronounced Davydov-splitted excitonic features with characteristic polarization dependence. A detailed discussion will be given of the exciton properties at the organic-inorganic interface in dependence on the crystallographic structure and the orientation of the ZnO surfaces.