Controlling exciton diffusion and fullerene distribution in photovoltaic blends by side chain modification

Muhammad Tariq Sajjad, Alexander J. Ward, Christian Kästner, Arvydas Ruseckas, Harald Hoppe, Ifor David William Samuel

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)
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Abstract

The influence of crystallinity on exciton diffusion and fullerene distribution
was investigated by blending amorphous and semicrystalline copolymers. We measured exciton diffusion and fluorescence quenching in such blends by dispersing fullerene molecules into them. We find that the diffusion length is more than two times higher in the semicrystalline copolymer than in the amorphous copolymer. We also find that fullerene preferentially mixes into disordered regions of the polymer film. This shows that relatively small differences in molecular structure are important for exciton diffusion and fullerene distribution.
Original languageEnglish
Pages (from-to)3054-3060
JournalJournal of Physical Chemistry Letters
Volume6
Issue number15
Early online date9 Jul 2015
DOIs
Publication statusPublished - 6 Aug 2015

Keywords

  • Exciton diffusion length
  • Organic solar cells
  • Bulk heterojunction (BHJ)
  • Conjugated polymer
  • Crystallinity

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