Synthesis and photovoltaic properties of alkoxy-benzimidazole containing low band gap polymers

Joo Young Shim, Taehyo Kim, Juae Kim, Jinwoo Kim, Dongkyung Park, Il Kim, Han Young Woo, Jin Young Kim, Hongsuk Suh

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Dioctyloxy substituted dimethyl-2H-benzimidazole (4,7-dibromo-5,6-dioctyloxy-2,2-dimethyl-2H-indene, DOMBI) was prepared and copolymerized with thiophene (or bithiophene) and carbazole using both Stille and Suzuki polymerization. In DOMBI, the sulfur at 2-position of 2,1,3-benzothiadiazole (BT) unit was replaced with dialkyl substituted carbon and dioctyloxy groups were introduced at 5,6-position of dimethyl-2H-benzimidazole (MBI) unit. DOMBI unit is still keeping 1,2-quinoid form with two alkyl groups on the carbon which substitute the sulfur of BT. In addition to this, dioctyloxy groups on 5,6-position will improve the absorption at the longer wavelength region. The poly(2,2-dimethyl-5,6-bis(octyloxy)-4-(2-thienyl)-2H-bezimidazole) (PTDOMBI) thin films show absorption band with peaks at 357 and 656 nm and an absorption onset at 775 nm, corresponding to a band gap of 1.60 eV. The devices with PTDOMBI with [6,6]phenyl-C71-butyric acid methyl ester showed power conversion efficiency of 0.76%.

Original languageEnglish
Pages (from-to)29-35
Number of pages7
JournalThin Solid Films
Volume580
DOIs
Publication statusPublished - 2015 Apr 1
Externally publishedYes

Keywords

  • DOMBI
  • OPVs
  • Polymer
  • PTDOMBI
  • Solubility

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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