Photovoltaic performance and morphology of polyfluorene blends: The influence of phase separation evolution

Rafi Shikler, Marco Chiesa, Richard H. Friend

Research output: Contribution to journalArticlepeer-review

41 Scopus citations

Abstract

We report the composition profile in blends of hole-accepting and electron-accepting polyfluorenes. During solvent evaporation to form thin (∼150 nm thickness) solid films, demixing of the polymers produces micrometer scale lateral phase separation. We show here that demixing is more complete in regions closer to the interface between the two phases. We propose that carriers transport is easier in these regions than in the bulk. We show how this affects the photovoltaic efficiency of diodes made with these blends, which show a linear dependence of efficiency on the length of the interface between the phases.

Original languageEnglish
Pages (from-to)5393-5399
Number of pages7
JournalMacromolecules
Volume39
Issue number16
DOIs
StatePublished - 8 Aug 2006
Externally publishedYes

ASJC Scopus subject areas

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

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