Side-chain tunability of furan-containing low-band-gap polymers provides control of structural order in efficient solar cells

Alan T. Yiu, Pierre Beaujuge, Olivia P. Lee, Claire Woo, Michael F. Toney, Jean Frechet

Research output: Contribution to journalArticlepeer-review

412 Scopus citations

Abstract

The solution-processability of conjugated polymers in organic solvents has classically been achieved by modulating the size and branching of alkyl substituents appended to the backbone. However, these substituents impact structural order and charge transport properties in thin-film devices. As a result, a trade-off must be found between material solubility and insulating alkyl content. It was recently shown that the substitution of furan for thiophene in the backbone of the polymer PDPP2FT significantly improves polymer solubility, allowing for the use of shorter branched side chains while maintaining high device efficiency. In this report, we use PDPP2FT to demonstrate that linear alkyl side chains can be used to promote thin-film nanostructural order. In particular, linear side chains are shown to shorten π-π stacking distances between backbones and increase the correlation lengths of both π-π stacking and lamellar spacing, leading to a substantial increase in the efficiency of bulk heterojunction solar cells. © 2011 American Chemical Society.
Original languageEnglish (US)
Pages (from-to)2180-2185
Number of pages6
JournalJournal of the American Chemical Society
Volume134
Issue number4
DOIs
StatePublished - Jan 19 2012

ASJC Scopus subject areas

  • Biochemistry
  • Colloid and Surface Chemistry
  • Chemistry(all)
  • Catalysis

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