Balanced Ambipolar Charge Transport in Organic Field-Effect Transistors and High-Voltage Logic Applications using Diketopyrrolopyrrole-based Copolymers
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A diketopyrrolopyrrole(DPP)-based copolymer (PDPADPP) was synthesized, and the electrical performance in organic field-effect transistors(OFETs) and circuit was investigated. The as-cast OFETs showed ambipolar transport properties, with low hole and electron mobilities of 0.016 and 0.004 cm2 V–1 s–1, respectively. However, the 240°C annealed OFETs exhibited improved transport properties with balanced ambipolar transport, showing hole and electron mobilities of 0.065 and 0.089 cm2 V–1 s–1, respectively. To assess the PDPADPP OFETs’ suitability for high-voltage logic circuits, compact modeling was performed using the industry-standard small-signal Berkeley short-channel IGFET model(BSIM). The circuit simulation results demonstrate excellent logic application performance of the PDPADPP OFETs and illustrate that the 240°C annealed device exhibits ideal circuit properties.