Cyclopentadithiophene–based D–A–A–D-type polymer semiconductors with improved ambipolarity
발표자
()
초록
내용
We report that ambipolarity of donor–acceptor (D–A)-type polymer semiconductors can be improved by rearranging D and A moieties in the order of D–A–A–D in repeat units. In contrast to the conventional D–A polymer semiconductor comprising of cyclopentadithiophene–co–pyridylthiadiazole (PCDTPT), the CDT–PT–PT–CDT polymer (PCPPC) showed enhanced ambipolarity with electron and hole mobilities of 0.4 and 1.5 cm2/V–s, respectively. The enhanced ambipolarity of the PCPPC was attributed to more delocalized electrons through the polymer chains and deepened conduction band edge compared to those of the PCDTPT. Owing to the 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 simple design guideline for high-performance ambipolar polymer semiconductors.