화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Macromolecular Research, Vol.21, No.4, 406-413, April, 2013
DOI10.1007/s13233-013-1036-3  Export Citation
Synthesis of new broad absorption low band gap random copolymers for bulk heterojunction solar cell applications
Vellaiappillai Tamilavan, Myung Ho Hyun†, Sung-Ho Jin1, †, and Myungkwan Song1
  • Department of Chemistry, Chemistry Institute for Functional Materials, Pusan National University, Busan, 690-735, Korea
  • 1Department of Chemistry Education and Interdisciplinary Program of Advanced Information and Display Materials, Pusan National University, Busan, 609-735, Korea
E-mail:,
Three new low band gap random copolymers containing 3-octylthiophene, 2,1,3-benzothiadiazole and 1-(2,6-diisopropylphenyl)-2,5-di(2-thienyl)pyrrole at different ratios were synthesized by Suzuki polycondensation. The three copolymers were found to exhibit quite different absorption behaviors. Among the three copolymers, PTTPTTB-P1 prepared with the three monomer units at a ratio of 2:1:1 was found to show a quite broad and flat absorption maximum from 440 to 560 nm as a thin film, whereas PTTPTTB-P2 or PTTPTTB-P3 prepared with the three monomer units at a ratio of 3:2:1 or 3:1:2, respectively, were found to show a distinct absorption maximum at 550 nm or 470 nm, respectively. The optical band gaps of the copolymers estimated from the onset wavelength of absorption were 1.80 eV for all three polymers. Each of the copolymers was examined as an electron donor blending with PC70BM as an electron acceptor in bulk heterojunction (BHJ) solar cells. The maximum power conversion efficiency (PCE) of the BHJ solar cells fabricated in ITO/PEDOT:PSS/polymer:PC70BM (1:5 wt%)/LiF/Al configurations was 2.03% when the PTTPTTB-P1:PC70BM (1:5 wt%) blend was used as an active layer.
Keywords:1-(2,6-diisopropylphenyl)-2,5-di(2-thienyl)pyrrole;bulk heterojunction solar cells;conjugated polymers;copolymerization;low band gap polymers
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