Regensburg 2013 – scientific programme

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DS: Fachverband Dünne Schichten

DS 28: Layer Properties: Electrical, Optical, and Mechanical Properties

DS 28.13: Talk

Thursday, March 14, 2013, 12:45–13:00, H8

Transport properties of graphitized polymers — •Andreas Geworski, Yuri Koval, and Paul Müller — Department of Physics and Interdisciplinary Center for Molecular Materials, Universität Erlangen

We are able to convert a thin surface layer of polyimide into a graphite - like material by low-energy ion bombardment. We have found that the graphitized layer shows conductivities, which increase with the temperature of the polyimide during the ion irradiation process and which can reach more than 103 S/cm. The thickness of the graphitized layers is so low, that the films are rather transparent, which makes them interesting for carbon based optoelectronics. The optical properties were investigated in the wavelength range of 400nm-1100nm and compared to electrical measurements. The transition from insulating to semi metallic behavior already observed in the transport measurements appears in optical characterization, too. Standard interpretations like closing of an optical band gap are discussed.