화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Polymer(Korea), Vol.39, No.1, 71-77, January, 2015
Export Citation
유기태양전지를 위한 작은 밴드갭 고분자의 합성과 광전특성
Synthesis and Photovoltaic Properties of a Low Band Gap Polymer for Organic Solar Cell
우용호1, 이효상2, 3, 박성남3, 4, 최이준1, †, 김봉수2, 5, †
  • 1금오공과대학교 고분자공학과
  • 2한국과학기술연구원
  • 3고려대학교 그린스쿨
  • 4고려대학교 화학과
  • 5고려대학교, 과학기술연합대학원대학교(UST) 그린스쿨, 나노공학과
Yong-Ho Woo1, Hyo-Sang Lee2, 3, Sungnam Park3, 4, E-Joon Choi1, †, and BongSoo Kim2, 5, †
  • 1Department of Polymer Science and Engineering, Kumoh National Institue of Technology, Gumi 730-701, Korea
  • 2Korea Institue of Science and Technology, Hwarang-ro, Seongbuk-gu, Seoul 136-791, Korea
  • 3Green School, Korea University, Anam-dong 5-ga, Seongbuk-gu, Seoul 136-701, Korea
  • 4Department of Chemistry, Korea University, Seoul 136-713, Korea
  • 5Green School, Nanomaterials Science and Engineering, Korea University, University of Science & Technology, Anam-dong 5-ga, Seongbuk-gu, Seoul 136-701, Daejeon 305-350, Korea
E-mail:,
초록
본 연구에서는 전자가 풍부한 구조단위(dithienosilole 및 benzodithiophene)와 전자가 부족한 구조단위 (difluorobenzothiadiazole)를 주사슬에 교대로 갖는 작은 밴드갭 공중합체를 Stille 짝지움 반응을 이용하여 합성하였다. 1H NMR을 통하여 각 단계별 화합물과 고분자의 구조를 확인하였다. GPC, TGA, UV-vis 분광분석기 및 cyclic voltammetry를 이용하여 합성한 고분자의 특성을 조사하였다. 합성한 공액고분자와 PC70BM을 1:1.5, 1:2, 1:3, 1:3.5 및 1:4의 중량비로 혼합하여 ITO/PEDOT:PSS/polymer:PC70BM/Al의 구조로 유기태양전지 소자를 제작하여 그 광전특성을 조사하였다. 고분자:PC70BM의 혼합비율이 1:3에서 최고 1.0%의 광전변환효율이 달성되었다. TEM 실험을 통하여 1:3 혼합비율에서 유기태양전지에 가장 적합한 나노규모로 상분리가 일어났으며, 다른 혼합비율에서는 고분자와 PC70BM의 뭉침현상에 기인하여 태양전지 특성이 낮아졌다.
We synthesized a low band gap alternating copolymer containing electron-rich units (i.e. dithienosiloles and benzodithiophenes) and electron-deficient units (i.e. ifluorobenzothiadiazoles) 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.
Keywords:organic solar cell;low band gap;Stille coupling reaction;alternating copolymer.
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