A new type of thiadiazole-based acceptor unit and its donor–acceptor copolymers were synthesized and characterized to develop the high-performance semiconducting polymers for organic field-effect transistors (OFETs) and organic photovoltaics (OPVs). We successfully synthesized an anthra[1,2-c:5,6-c′]bis([1,2,5]thiadiazole) (ATz) core and ATz-quaterthiophene copolymers. These copolymers possess a wide energy gap of ca. 1.8 eV and a deeper HOMO energy levels around −5.4 eV than that of typical thiadiazole–oligothiophene copolymers. Such weak electron-accepting nature may be due to the decreased electron affinity of the ATz core by an existence of alkoxy groups with strong electron-donating ability. The ATz copolymers exhibited good semiconducting properties with hole mobility of up to 0.03 cm² V^–1 s^–1 and photovoltaic response with PCE of up to 5.7%, despite the unfavorable molecular orders, thin-film structure, and/or amorphous structure.

中文翻译：

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烷氧基取代的蒽[1,2- c：5,6- c ']双（[1,2,5]噻二唑）（ATz）：有机电子半导体聚合物中的新电子受体单元

合成了一种新型的基于噻二唑的受体单元及其供体-受体共聚物，并对其进行了表征，以开发用于有机场效应晶体管（OFET）和有机光伏（OPV）的高性能半导体聚合物。我们成功地合成了一种蒽[1,2- c：5,6- c']双（[[1,2,5]噻二唑）（ATz）核心和ATz-四噻吩共聚物。这些共聚物的能隙较宽，约为。与典型的噻二唑-低聚噻吩共聚物相比，具有1.8 eV的热能能级和-5.4 eV的深能级。这种弱的电子接​​受性质可能是由于存在具有强供电子能力的烷氧基而使ATz核的电子亲和力降低。尽管分子顺序，薄膜结构和/或无定形结构不利，ATz共聚物仍表现出良好的半导体性能，空穴迁移率高达0.03 cm ² V ^–1 s ^–1，光伏响应的PCE高达5.7％。