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Ma, Suxiang; Wang, Junwei; Feng, Kui; Zhang, Hao; Wu, Ziang; Wang, Yimei; Liu, Bin; Li, Yongchun; An, Mingwei; Gonzalez-Nuñez, Raúl; Ponce Ortiz, Rocío; Woo, Han Young; Guo, Xugang
ACS applied materials & interfaces, 01/2023, Volume: 15, Issue: 1Journal Article
The development of n-type organic semiconductors critically relies on the design and synthesis of highly electron-deficient building blocks with good solubility and small steric hindrance. We report here a strongly electron-deficient dithienylpyrazinediimide (TPDI) and its n-type semiconducting polymers. The pyrazine substitution leads to the resulting polymers with much lower-lying lowest unoccupied molecular orbital (LUMO) levels and improved backbone planarity compared to the reported dithienylbenzodiimide (TBDI)- and fluorinated dithienylbenzodiimide (TFBDI)-based polymer analogues, thus yielding n-type transport character with an electron mobility up to 0.44 cm2 V–1 s–1 in organic thin-film transistors. These results demonstrate that dithienylpyrazinediimide is a highly promising electron-deficient building block for constructing high-performance n-type polymers and the incorporation of pyrazine into imide-functionalized (hetero)arenes is an effective strategy to develop n-type polymers with deep-lying frontier molecular orbital (FMO) levels for organic optoelectronic devices.
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