Benzodithiophene-thiophene-based photovoltaic polymers with different side-chains

Thanh Luan Nguyen, Seyeong Song, Seo Jin Ko, Hyosung Choi, Ji Eun Jeong, Taehyo Kim, Sungu Hwang, Jin Young Kim, Han Young Woo

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

A series of benzodithiophene-thiophene-based alternating copolymers were synthesized with different side-chains, and their photovoltaic characteristics were examined. The choice of solubilizing side-chains influences significantly the chain conformation, frontier orbital energy levels, intermolecular organization, and the resulting optical, morphological, and photovoltaic properties. The incorporation of an e-withdrawing carbonyl group in the side-chain decreased the highest occupied molecular orbital (HOMO, ca. -5.4 eV) level and improved the chain planarity through intrachain hydrogen bonding. The shortest π-π stacking distance (3.72 Å) was also measured for the alkylcarbonyl-substituted BDTCOT:PC71BM blended film by two dimensional grazing incidence X-ray scattering. With compared to other polymers, the BDTCOT:PC71BM device showed a substantially improved open-circuit voltage and short-circuit current density, leading to a 4.66% power conversion efficiency. The side-chains need to be designed to be multifunctional to induce a deep HOMO level and chain planarity (for interchain ordering) as well as good solution processability.

Original languageEnglish
Pages (from-to)854-862
Number of pages9
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume53
Issue number7
DOIs
Publication statusPublished - 2015 Apr 1
Externally publishedYes

Keywords

  • benzodithiophene
  • conjugated polymers
  • copolymerization
  • organic photovoltaics
  • renewable resources

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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