Tuning joint sequence for donor–acceptor polymers based on fluorinated benzothiadiazole with thiophene/furan bridecakes. (5th November 2015)

• Record Type: Journal Article
• Authors: Wu, Feiyan; Chen, Shuangying; Chen, Lie; Chen, Yiwang
• Is Part Of: Polymer. Volume 78(2015)
• Page Start: 154
• Page End: 160
• Publication Date: 2015-11-05
• Subjects: Donor–acceptor polymers -- Thiophene/furan bridges -- Polymer solar cell; Polymers -- Periodicals; Polymerization -- Periodicals; Polymères -- Périodiques; Polymérisation -- Périodiques; 547.7
• DOI: 10.1016/j.polymer.2015.09.066
• Languages: English
• ISSNs: 0032-3861

Abstract

Abstract: Three new donor–acceptor (D–A) polymers, PTBDT-ffBT-FT12, PTBDT-ffBT-TT12 and PTBDT-ffBT-T12 T, based on thiophene substituted benzene[1, 2-b:4, 5-b′] thiophene (TBDT) and fluorinated benzothiadiazole (ffBT) with thiophene/furan conjugated bridges were prepared. The joint sequence of alkyl thiophene/furan bridges has significant influence on the energy levels, band-gap and molecule stacking of the copolymers. All copolymers show broad absorption bands, and the energy level and band gap could be well fine-tuned by the introduction of thiophene/furan bridges to polymer backbone. The small atomic radius of oxygen atom on furan bridges resulted in the inferior co-planarity and torsion backbone for PTBDT-ffBT-FT12 with furan bridges, while the adjacent dodecyl on thiophene bridges close to TBDT led to a big steric hindrance. As a result, the polymer solar cell (PSC) based on PTBDT-ffBT-T12 T achieves the better efficiency compared to PTBDT-ffBT-FT12 and PTBDT-ffBT-TT12 . Graphical abstract: The joint sequence of alkyl thiophene/furan bridges has significant influence on the energy levels, band-gap and molecule stacking of the copolymers. Highlights: Three new donor–acceptor polymers with thiophene/furan bridges were prepared. The band gap and energy levels could be well fine-tuned. The joint sequence of alkyl thiophene/furan bridges has significant influence.