Carrier transport properties of organic field effect transistors in\ndinaphtho[2,3-b:2'',3''-f]thieno[3,2-b]thiophene single crystals have been investigated under\nhigh pressure. In contrast to the typical pressure effect of monotonic increase in charge\ntransfer rates according to the application of external hydrostatic pressure, it is clarified\nthat the present organic semiconductor devices exhibit nonmonotonic pressure response,\nsuch as negative pressure effect. X-ray diffraction analysis under high pressure reveals that\non-site molecular orientation and displacement in the heteroacene molecule is assumed to\nbe the origin for the anomalous pressure effects.
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