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Quinoid heteropentacenes as promising organic semiconductors for field-effect transistor applications

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8 Author(s)
Kalb, Wolfgang L. ; Laboratory for Solid State Physics, ETH Zurich, 8093 Zurich, Switzerland ; Stassen, Arno F. ; Batlogg, Bertram ; Berens, Ulrich
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We report on a quinoid heteropentacene as p-type semiconductor in organic field-effect transistors. Both single crystal and thin-film transistors were fabricated with 7,14-diphenyl-chromeno[2,3-b]xanthene (DPCX). In this small molecule organic semiconductor the field-effect mobility is as high as 0.16 cm2/V s in single-crystal devices and 0.01 cm2/V s in thin-film devices. In addition, the devices show favorable properties such as near zero onset/threshold voltages and a small current hysteresis. X-ray diffraction experiments show the molecules to be arranged in slipped stacks and to have a flat backbone in the crystals. For thin films of DPCX the situation is complicated by the coexistence of a thin-film phase with the bulk phase. However, a comparison of DPCX thin films on octadecyltrichlorosilane (OTS)-treated and bare SiO2 gate dielectrics provides clear evidence that the OTS surface treatment leads to organic thin films with a better structural order. The low-cost synthesis and purification of DPCX along with the improved processability and the good electrical characteristics suggest that quinoid heteropentacenes are promising materials for organic field-effect transistors.

Published in:

Journal of Applied Physics  (Volume:105 ,  Issue: 4 )

Date of Publication:

Feb 2009

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