Ambipolar pentacene field-effect transistors and inverters

Organic field-effect transistors based on pentacene single crystals, prepar ed with an amorphous aluminum oxide gate insulator, are capable of ambipola r operation and can be used for the preparation of complementary inverter c ircuits. The field-effect mobilities of carriers in these transistors incre ase from 2.7 and 1.7 square centimeters per volt per second at room tempera ture up to 1200 and 320 square centimeters per volt per second at Low tempe ratures for hole and electron transport, respectively, following a power-la w dependence. The possible simplification of the fabrication process of com plementary Logic circuits with these transistors, together with the high ca rrier mobilities, may be seen as another step toward applications of plasti c electronics.