Silaindacenodithiophene-based low band gap polymers - The effect of fluorine substitution on device performances and film morphologies

Bob C. Schroeder, Zhenggang Huang, Raja Shahid Ashraf*, Jeremy Smith, Pasquale D'Angelo, Scott E. Watkins, Thomas D. Anthopoulos, James R. Durrant, Iain McCulloch

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

170 Scopus citations

Abstract

Silaindacenodithiophene is copolymerized with benzo[c][1,2,5]thiadiazole (BT) and 4,7-di(thiophen-2-yl)benzo[c][1,2,5]thiadiazole (DTBT), respectively their fluorinated counter parts 5,6-difluorobenzo[c][1,2,5]thiadiazole (2FBT) and 5,6-difluoro-4,7-di(thiophen-2-yl) benzo[c][1,2,5]thiadiazole (2FDTBT). The influence of the thienyl spacers and fluorine atoms on molecular packing and active layer morphology is investigated with regard to device performances. bulk heterojunction (BHJ) solar cells based on silaindacenodithiophene donor-acceptor polymers achieved PCE's of 4.5% and hole mobilities of as high as 0.28 cm 2/(V s) are achieved in an organic field-effect transistor (OFET).

Original languageEnglish (US)
Pages (from-to)1663-1670
Number of pages8
JournalAdvanced Functional Materials
Volume22
Issue number8
DOIs
StatePublished - Apr 24 2012

Keywords

  • conjugated polymers
  • fluorine
  • hole mobility
  • silaindacenodithiophene
  • solar cell

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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