Synthesis and photovoltaic properties of a low band gap polymer for organic solar cell

Yong Ho Woo, Hyo Sang Lee, Sungnam Park, E. Joon Choi, Bong Soo Kim

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


We synthesized a low band gap alternating copolymer containing electron-rich units (i.e. dithienosiloles and benzodithiophenes) and electron-deficient units (i.e. difluorobenzothiadiazoles) for high performance organic solar cells. The polymer was prepared by the Stille coupling reaction and characterized using 1H NMR, GPC, TGA, UV-visible absorption spectroscopy, and cyclic voltammetry. Solar cells were fabricated in a structure of ITO/PEDOT:PSS/polymer:PC70BM/Al with five different blending ratios of polymer and PC70BM (1:1.5, 1:2, 1:3, 1:3.5 and 1:4 by weight ratio). The best efficiency was achieved from the 1:3 ratio of polymer and PC70BM in the photoactive layer, and TEM revealed that there is an optimal nanoscale phase separation between polymer and PC70BM in the 1:3 ratio blend film.

Original languageEnglish
Pages (from-to)71-77
Number of pages7
JournalPolymer (Korea)
Issue number1
Publication statusPublished - 2015 Jan 1


  • Alternating copolymer
  • Low band gap
  • Organic solar cell
  • Stille coupling reaction

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Polymers and Plastics
  • Materials Chemistry


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