Abstract
A hybrid metal-base organic transistor composed of a vacuum-deposited small-molecule emitter layer and a solution-processed polymer collector layer was fabricated using three types of conductive polymer, poly(3-hexylthiophene) (P3HT), poly(2-methoxy-5(2′-ethyl)hexoxy-phenylenevinylene (MEH-PPV) and poly(9, 9-dioctylfluorene-co-benzothiadiazole) (F8BT). Clear current amplification was observed only in the device with P3HT, and output current density of 12.6 mA/cm2, on/off ratio of 105, and current amplification factor of 76 were achieved at a collector voltage of 5 V and base voltage of 3 V. The output current decreased in order of P3HT > MEH-PPV > F8BT. The relationship between energy levels of polymer materials and carrier transmission process through the base electrode were discussed.
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