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In this work we study the cross-linked poly(vinyl alcohol)/poly(3-hexylthiophene) interfacial properties of an organic field effect transistor. We use cross-linked poly(vinyl alcohol) prepared with different ammonium dichromate:poly(vinyl alcohol) proportions, ranging from 0% to 35%, as insulator. Using admittance spectroscopy, we show that the interfacial properties change when the ammonium dichromate concentration is altered. The interfacial properties and the better insulation are responsible for the improvement of the device performance in these organic field effect transistors, achieving best performance in the blend with ammonium dichromate:poly(vinyl alcohol) proportion of 0.25:1.

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We use evaporated C60 fullerene as emitter, a conducting polymer blend as base, and Si as collector in a vertical transistor structure similar to a metal-base transistor. The conducting polymer blend used as a base is poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate). The measured common-base current gain of our pseudo-metal-base transistor (p-MBT) is close to 1.0. The p-MBT is straightforward to fabricate and is compatible with conventional Si-based electronics.

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