Organic/polymer semiconductors have attracted considerable attention because of due their potential applications in large-area, flexible, and low-cost opto-electronic devices and integrated circuits. Organic semiconductor layer is a main constituent and determines device performance. As a main constituent of organic/polymer field-effect transistors (FETs), organic/polymer semiconductors determines electronic properties and were intensively studied by both the industrial and academic researchers. Organic/polymer semiconductors and their FET devices have developed rapidly in the past decades. To data, to obtain high-mobility organic/polymer semiconductors is an important challenge. We designed and synthesized novel organic/polymer semiconductors with large pi-conjugated structures and fabricated their FET devices. The copolymer based on diketopyrrolopyrrole and (E)-2-(2-(thiophen-2-yl)vinyl)thiophene units exhibited excellent field-effect properties with a high mobility of 8.2 cm2/V‒1 s‒1. Meanwhile, we studied effect of molecular structures of main backbone and length of side-chains of the polymers on electronic properties of FET devices.
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