Dresden 2014 – scientific programme

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DS: Fachverband Dünne Schichten

DS 27: Organic Thin Films II

DS 27.1: Talk

Wednesday, April 2, 2014, 15:00–15:15, CHE 91

All-UHV growth of organic/ZnO hybrid structures — •Mino Sparenberg, Sylke Blumstengel, and Fritz Henneberger — HU zu Berlin, Institut für Physik, AG Photonik

Conjugated organic molecules have a great potential for opto-electronic devices when used in hybrid components together with inorganic semiconductors where the advantages of both materials are combined. Crucial for the fabrication of hybrid structures is the understanding of the interaction at the interface between the organics and the inorganics. To achieve this the growth is conducted and observed in an all-UHV MBE system where growth conditions of the conjugated molecules can be controlled and analysed in-situ with electron diffraction techniques as well as scanning probe microscopes. The inorganic semiconductor investigated here is epitaxially grown ZnO which has been proven for its suitability in hybrid structures with several conjugated molecules. As model systems of the present study, serve aromatic hydrocarbons like the linear sexiphenyl (6P) and its fluorinated derivatives to investigate how the electrostatic interaction at the interface of the ZnO substrate influences the growth of the molecules, as it is predicted in theory, as well as the planar molecule hexabenzocoronene (HBC), which is due to its hexagonal symmetry a promising candidate to create an epitaxial-like growth on top of the ZnO crystal. Our measurements have shown that the fluorination of 6P leads to an interaction with the substrate surface, changing the growth mode in comparison unfluorinated 6P species. Furthermore STM and LEED investigations of HBC samples indicate a predominant growth direction correlated with the substrate.