Indacenodithiophene-co-benzothiadiazole copolymers for high performance solar cells or transistors via alkyl chain optimization

Hugo Bronstein, Dong Seok Leem, Richard Hamilton, Paul Woebkenberg, Simon King, Weimin Zhang, Raja Ashraf, Martin Heeney, Thomas Anthopoulos, John De Mello, Iain Mcculloch*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

137 Scopus citations

Abstract

A study was conducted to prepare indacenodithiophene-co-benzothiadiazole copolymers ((IDT-BT) for high performance solar cells or transistors via alkyl chain optimization. The synthesis and high hole mobility of an IDT-BT copolymer with hexadecyl alkyl chains was demonstrated. The long linear alkyl chains were attributed to impart some degree of crystallinity in thin film. The high performance of a similar IDT-BT copolymer bearing phenylhexyl side chains in solar cell devices was also investigated. Replacement of benzothiadiazole on this system with alternative acceptors yielded efficient solar cells. Solar cells with device structure ITO/PEDOT:PSS/polymer P4:PC71BM/Ca/Al were fabricated and their averaged properties were shown. AFM images of the devices were also recorded to probe the underlying cause of this significant variation in device performance.

Original languageEnglish (US)
Pages (from-to)6649-6652
Number of pages4
JournalMacromolecules
Volume44
Issue number17
DOIs
StatePublished - Sep 13 2011

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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