Enhanced ambipolarity of cyclopentadithiophene-<em>co</em>-pyridylthiadiazole D–A–A–D–type polymers
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Herein, we demonstrate that ambipolarity of a donor–acceptor (D–A)-type polymer semiconductor can be improved by rearranging D and A moieties in the order of D–A–A–D in their repeat units. In contrast to the conventional D–A polymer semiconductor comprising of cyclopentadithiophene–pyridylthiadiazole (PCDTPT), the CDT–PT–PT–CDT polymer (PCPPC) showed enhanced ambipolarity with electron and hole mobilities of 0.3 and 0.8 cm2/V–s, respectively. We attribute the enhanced electron mobility and ambipolarity of the PCPPC to more delocalized electrons throughout the polymer chains and deepened conduction band edge compared to those of the PCDTPT. Owing to the well-balanced electron and hole mobilities, the organic complementary metal-oxide semiconductor (CMOS) inverter fabricated with the PCPPC showed a remarkably high gain of 110 at an operation voltage of 100 V. Our results provide a facile design strategy for high-performance ambipolar polymer semiconductors.