Regensburg 2010 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 20: Organic Semiconductors: Transistors and OLEDs

HL 20.3: Vortrag

Dienstag, 23. März 2010, 10:00–10:15, H15

Molecular weight dependent short channel effect in MDMO-PPV — •Ali Veysel Tunc, Elizabeth von Hauff, and Jürgen Parisi — University of Oldenburg, Department of Physics, Energy and Semiconductor Research Laboratory, Carl-von-Ossietzky Str. 9-11, 26129 Oldenburg, Germany

In this study, organic field effect transistors (OFETs) based on poly [2-methoxy,5-(3',7'-dimethyl-octyloxy)]-p-phenylene vinylene (MDMO-PPV) with two different weight-average molecular weights (Mw) were fabricated and the effect of the molecular weight on the device properties was investigated. It was observed that the operation performance of the OFET depends on the molecular weight and channel length. The short channel effect was observed, i.e. a lack of saturation in the output characteristic with a fixed gate voltage. We found that the saturation behavior and hole mobility of a given material strongly depend on molecular weight. Short channel effects were observed in higher molecular weight for MDMO-PPV. The hole mobility around 10 times better for higher molecular weight that has been shown in literature.