Role of the side chain in the phase segregation of polymer:fullerene bulk heterojunction composites

Heejoo Kim, Byoung Hoon Lee, Kyu Cheol Lee, Geunjin Kim, Jin Young Yu, Nara Kim, Seoung Ho Lee, Kwanghee Lee

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

The correlation between the geometrical structural change in push-pull π-conjugated polymers and the formation of phase segregation in their bulk heterojunction (BHJ) composite films is investigated. When substituted with large alkyl side chains, the polymer wires experience serious conformational distortion by increasing the torsion energy of dihedral angles along the backbone and undergo large-scale phase segregation in the BHJ composites.

Original languageEnglish
Pages (from-to)1575-1580
Number of pages6
JournalAdvanced Energy Materials
Volume3
Issue number12
DOIs
StatePublished - Dec 2013

Keywords

  • bulk heterojunction composites
  • phase segregation
  • polymer solar cells
  • push-pull π-conjugated polymers
  • torsion energy

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