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Organic thin film field-effect transistors based on pentacene have been fabricated by the method of fullyevaporation. The present device with a thin insulator layer can operate in low voltage, and shows ambipolar mode. In the case of the p-channel, the field-effect hole mobility was calculated to be 0.17cm2/Vs, whereas the field-effect electron mobility was about 0.02 cm2/Vs for n-channel.