A diketopyrrolopyrrole conjugated polymer based on 4,4ʹ-difluoro-2,2ʹ-bithiophene for organic thin-film transistors and organic photovoltaics

Yinghui He,Badrou Reda Aïch,Jianping Lu,Salima Alem,Stephen Lang, Raluca Movileanu,Jean-Marc Baribeau,Ye Tao

Thin Solid Films（2020）

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摘要

•4,4ʹ-Difluoro-2,2ʹ-bithiophene (DFBT) was designed and synthesized.•A donor-acceptor copolymer of diketopyrrolopyrrole and DFBT was prepared.•Fluorination of bithiopheneat 4, 4ʹ positions has big effects on the properties.•The copolymer demonstrated a hole mobility of 0.21 cm2/VS in transistors.•The copolymer exhibited an efficiency of 3.4% with a high fill factor of 69%.

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关键词

Polymer semiconductors,Fluorinated bithiophene,Organic thin film transistors,Organic solar cells,Fluorine substitution positions

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