Regensburg 2007 – scientific programme
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SYOE: Symposium Organic Thin Film Electronics: From Molecular Contacts to Devices
SYOE 8: Poster Session SYOE
SYOE 8.96: Poster
Tuesday, March 27, 2007, 18:00–20:00, Poster B
Charge transport in C60/CuPc donor-acceptor blends — Markus Bronner, •Andreas Opitz, and Wolfgang Brütting — Institut für Physik, Universität Augsburg, 86135 Augsburg, Germany
In recent years, large progress has been made in the realization of electronic circuits based on organic field-effect transistors (OFETs). However, these circuits as being built-up of unipolar (mostly p-type) OFETs only, have a number of drawbacks. To overcome them, recently, ambipolar OFETs have been suggested as a first step towards complementary organic circuits.
In this work we are analysing the ambipolar charge transport in blend systems of small organic molecules. These mixed layers are prepared by co-evaporation of n-conducting fullerene (C60) and p-conducting copper-phthalocyanine (CuPc) on pre-structured TFT-substrates. It was found that the electrical characteristics (e.g. mobilities of holes and electrons and threshold voltages) depend strongly on the composition of the blend and on the preparation conditions like substrate treatment and substrate temperature during evaporation. The film structure and the morphology were analysed by X-ray diffraction and scanning force microscopy.