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

Kalb, Wolfgang L, Stassen, Arno F, Batlogg, Bertram, Berens, Ulrich, Schmidhalter, Beat, Bienewald, Frank, Hafner, Andreas and Wagner, Beatrix (2009) Quinoid heteropentacenes as promising organic semiconductors for field-effect transistor applications. Journal of Applied Physics, 105 (4). p. 43705. ISSN 0021-8979


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

Item Type: Article
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Additional Information: Author can archive post-print (ie final draft post-refereeing); publisher PDF may be used on institutional website
Keywords: electron mobility; organic field effect transistors; organic semiconductors; thin film transistors; X-ray diffraction
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Date Deposited: 22 Feb 2010 11:50
Last Modified: 22 Feb 2010 11:50


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