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

Kalb, Wolfgang L and Stassen, Arno F and Batlogg, Bertram and Berens, Ulrich and Schmidhalter, Beat and Bienewald, Frank and 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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