Naphthodithiophene-naphthobisthiadiazole copolymers for solar cells: Alkylation drives the polymer backbone flat and promotes efficiency

Itaru Osaka, Takeshi Kakara, Noriko Takemura, Tomoyuki Koganezawa, Kazuo Takimiya

Research output: Contribution to journalArticle

268 Citations (Scopus)

Abstract

We show that rational functionalization of the naphthodithiophene core in copolymers based on naphthodithiophene and naphthobisthiadiazole improves the solubility without an alteration of the electronic structure. Surprisingly, the introduction of linear alkyl chains brings about a drastic change in polymer orientation into the face-on motif, which is beneficial for the charge transport in solar cells. As a result, the present polymers exhibit high power conversion efficiencies of up to ∼8.2% in conventional single-junction solar cells.

Original languageEnglish
Pages (from-to)8834-8837
Number of pages4
JournalJournal of the American Chemical Society
Volume135
Issue number24
DOIs
Publication statusPublished - 2013 Jun 19

ASJC Scopus subject areas

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

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