Regensburg 2007 – wissenschaftliches Programm

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SYOE: Symposium Organic Thin Film Electronics: From Molecular Contacts to Devices

SYOE 8: Poster Session SYOE

SYOE 8.95: Poster

Dienstag, 27. März 2007, 18:00–20:00, Poster B

Influence of dielectric surface modification on perylene thin-film properties and OTFT performance — •Christian Effertz, Maryam Beigmohamadi, Phenwisa Niyamakom, Azadeh Farahzadi, Philip Schulz, and Matthias Wuttig — Institute of Physics (IA), RWTH Aachen University of Technology, 52056 Aachen, Germany

Organic Thin-Film Transistors (OTFTs) are promising for electronic application, e.g. as an active matrix for flexible displays. It has been suggested that some organic materials, such as perylene, show a high field-effect mobility, comparable to hydrogenated amorphous silicon (a-Si:H). Since the properties of the organic thin film have a major influence on the field-effect mobility, an understanding of the influence of structural properties and morphology on device efficiency is necessary.

In this study, perylene-based OTFTs have been investigated employing two different dielectric layers, SiO₂ and Al₂O₃ 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 . Subsequently the influence of surface modification of the dielectric layer, e.g. surface treatment by UV-ozone or self-assembled monolayers of octadecyltricholorsilane (OTS), on film properties and device efficiency has been studied. Different characterization techniques, including the atomic force microscopy (AFM) for surface morphology, x-ray diffractometry (XRD) for structural analysis and drop shape analysis for determination of surface free energy, have been employed in this investigation.