Berlin 2008 – scientific programme

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DS: Fachverband Dünne Schichten

DS 18: Poster: Towards Molecular Spintronics, Organic Thin Films, Optical Layers, Vibrational Spectroscopy, Tayloring organic interfaces

DS 18.19: Poster

Tuesday, February 26, 2008, 14:30–19:30, Poster A

Temperature dependent measurements on perylene thin-film based OTFTs — •Christian Effertz, Moritz Schaefer, Maryam Beigmohamadi, Azadeh Farazadi, Phenwisa Niyamakom, Philip Schulz, and Matthias Wuttig — Institute of Physics (IA), RWTH Aachen University, 52056 Aachen, Germany

Organic Thin-Film Transistors (OTFTs) are promising candidates for electronic applications, e.g. as an active matrix for flexible displays. Some organic materials, such as perylene, show a high field-effect mobility, comparable to hydrogenated amorphous silicon (a-Si:H). In order to describe the mechanism of charge transport, competing models, like the grain boundary model, the small polaron model and the multiple trapping and release model have been developed in the past. However, for a wide range of organic semiconductors it is not yet understood what model has to be applied. In order to gain a deeper insight into the transport meachnisms of organic materials we present temperature dependent measurements of the electronic transport in perylene-based OTFTs. The temperature range between 213K and 418K has been investigated. The TFTs were produced employing OTS and 2-propanol modified SiO₂ dielectric layers, on top of highly doped silicon substrates, which were used as the gate contact. Thermally evaporated gold pads acted as the contacts for the source and drain of the devices. Besides electronic measurements, additional characterization techniques, including Atomic Force Microscopy (AFM) for the surface morphology and X-Ray Diffractometry (XRD) for structural analysis of the organic layer have been employed in this investigation.