Regensburg 2010 – scientific programme

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DS: Fachverband Dünne Schichten

DS 29: Poster: Molecular Spintronics, Biomolecular and Functional Organic Layers, Organic Electronics and Photovoltaics, Plasmonics and Nanophotonics, Organic Thin Films, Nanoengineered Thin Films, Thin Film Characterisation,

DS 29.21: Poster

Wednesday, March 24, 2010, 15:00–17:30, Poster A

Space charge effects and charge injection in organic semiconductors — •Marlis Ortel, Sidhant Bom, Torsten Balster, Benedikt Gburek, and Veit Wagner — School of Engineering and Science, Jacobs University Bremen, Campus Ring 1, 28759 Bremen, Germany

Organic circuits with high-frequency switching properties are important for an increasing number of applications. It has been shown that contact resistance sets a limit towards higher frequencies.1 Therefore it is crucial to obtain good injection properties of charge carriers from the contact materials into the organic semiconductor.

It is known that injection of charge carriers is influenced by space charges at the interface caused by low mobilities of semiconducting materials. For different transport mechanisms possible in organic semiconductor materials different forms of space charge zones can be predicted by theory close to the injecting contact.

Experimentally current-voltage measurements are performed on various thiophene-based devices. The investigated thiophene-based materials are selected such, that they realize strongly different transport behavior. The measurements are compared to the theoretical predictions. We find, that higher disorder results in a larger space charge region even for the same mobility value.

1 V. Wagner, P. Wöbkenberg, A. Hoppe, J. Seekamp; Appl. Phys. Lett. 89 (2006) 243515.1-3