A Novel fluorinated bithiophene imide (BTI)-based unipolar electron transport polymers s-BTI2F-FT was synthesized. s-BTI2F-FT was constructed on a BTI dimer with two fluorine atoms dedicated in β-position of thiophene, showing a lower-lying frontier molecular orbitals (FMOs) and higher crystallinity than non-fluorinated analog s-BTI2-FT. s-BTI2F-FT exhibited a remarkable unipolar electron mobility of 2.73 cm2V-1s-1, which is the champion value for organic thin-film transistors(OTFT) based on BTI polymer semiconductors. Moreover, s-BTI2F-FT can act as an acceptor component in all-polymer solar cells (all-PSCs) by incorporating widely-used PTB7-Th as a donor component. As a result, the all-polymer device exhibited an efficient PCE of 6% which is 60-fold higher than the reference device based on s-BTI2-FT as an acceptor. The thus-obtained results show that s-BTI2F-FT can be regarded as a versatile high-performance unipolar electron-transporting material both for n-channel OTFTs and all-PSCs and fluorination engineering can offer an effective strategy for designing polymers with well-ordered film microstructures and enhanced crystallinity.

Fluorinated imide-based polymers: Versatile high-performance unipolar electron transport organic semiconductors for organic thin-film transistors and all-polymer solar cells

256th National Meeting (2018)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.