Poly(diketopyrrolopyrrole-benzothiadiazole) with Ambipolarity Approaching 100% Equivalency

Abstract

We describe the realization of equivalent ambipolar organic field-effect transistor (FET) by using a single-component visible-near infrared absorbing diketopyrrolopyrrole (DPP)-benzothiadiazole (BTZ) copolymer, namely poly{3,6-dithien-2-yl-2,5-di(2-decyltetradecanyl)-pyrrolo[3,4-c]pyrrole-1,4-dione-5’,5’’-diyl-alt-benzo-2,1,3-thiadiazol-4,7-diyl} (PDTDPP-alt-BTZ). PDTDPP-alt-BTZ shows not only unprecedented balanced charge carrier mobilities for both electron (e = 0.089 cm2V-1s-1) and hole (h = 0.097 cm2V-1s-1) but also the inverter constructed with the combination of two identical ambipolar FETs exhibits a gain of ~35 that is much higher than usually obtained for unipolar logic.