期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 46, 页码 40549-40555出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b13570
关键词
organic thin-film transistors; electron-deficient building blocks; donor-acceptor copolymers; isoindigo; molecular packing
资金
- National Natural Science Foundation of China [51572016, 21504026]
- China Postdoctoral Science Foundation [2013M542009, 2016T90686]
- National Program on Key Basic Research Project (973 Program) [2013CBA01600]
The exploration of novel electron-deficient building blocks is a key task for developing high-performance polymer semiconductors in organic thin-film transistors. In view of the situation of the lack of strong electron-deficient building blocks, we designed two novel pi-extended isoindigo-based electron-deficient building blocks, IVI and F4IVI. Owing to the strong electron-deficient nature and the extended pi-conjugated system of the two acceptor units, their copolymers, PIVI2T and PF(4)IVI2T, containing 2,2'-bithiophene donor units, are endowed with deep-lying highest occupied molecular orbital (HOMO)/lowest unoccupied molecular orbital (LUMO) energy levels and strong intermolecular interactions. In comparison to PIVI2T, the fluorinated PF(4)IVI2T exhibits stronger intra- and intermolecular interactions, lower HOMO/LUMO energy levels up to -5.74/-4.17 eV, and more ordered molecular packing with a smaller pi-pi stacking distance of up to 3.53 angstrom, resulting in an excellent ambipolar transporting behavior and a promising application in logic circuits for PF(4)IVI2T in ambient with hole and electron mobilities of up to 1.03 and 1.82 cm2 V-1 s(-1), respectively. The results reveal that F4IVI is a promising and strong electron-deficient building unit to construct high-performance semiconducting polymers, which provides an insight into the structureproperty relationships for the exploration and molecular engineering of excellent electron-deficient building blocks in the field of organic electronics.
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