A benzothiadiazole-based oligothiophene for vacuum-deposited organic photovoltaic cells

Jin Ah Kong, Eunhee Lim, Kyeong K. Lee, Sungkoo Lee, Sung Hyun Kim

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)


We introduced a benzothiadiazole unit into a small molecule conjugated system and determined the electronic features and organic photovoltaic cell (OPV) characteristics of the resulting material, 4,7-bis(5′-hexyl-2, 2′-bithiophene-5-yl)benzothiadiazole (DH5TB). DH5TB showed remarkably red-shifted UVvis absorption and photoluminescence (PL) emission spectra compared with α,α′-dihexyl-quinquethiophene (DH5T). The low energy band gap of 1.95 eV and good film morphology of DH5TB resulted in good OPV performance. We investigated the DH5TB:C60 blend ratio dependence on OPV performance and further improved the efficiency by introducing a C 60 interlayer on top of the DH5TB:C60 layer. In the present work, the best photovoltaic cells had a JSC of 4.75 mA/cm2, a VOC of 0.53 V, and a fill factor (FF) of 0.38, giving a power conversion efficiency of 0.97% under AM 1.5 (100 m/cm 2) without thermal annealing.

Original languageEnglish
Pages (from-to)2057-2063
Number of pages7
JournalSolar Energy Materials and Solar Cells
Issue number12
Publication statusPublished - 2010 Dec


  • Benzothiadiazole
  • Low band gap
  • Oligothiophene
  • Organic photovoltaic cells
  • Solar cells

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films


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