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제114회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Synthesis and Photovoltaic properties of novel electron deficient unit 2,2-bithiophene-3,3-dicarboximide-based D?A type copolymer

2014년 8월 28일 17시 56분 23초
ORGN.P-892 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 15일 (수요일) 16:00~19:00
저자 및
한가람, 서홍석*
부산대학교 화학과, Korea
The novel electron deficient moiety unit, 4H-dithieno[3,2-c:2’,3’-e]azepine-4,6(5H)-dione, was utilized and prepared for the synthesis of the conjugated alternating polymers containing electron Donor and Acceptor (D-A) pair for Bulk Heterojunction (BHJ) solar cells. The dithienoazepinedione, bithiophene imide (BTI) group, is a stylish electron deficient unit as it demonstrates strong electron-withdrawing disposition, and planar structural design. The polymer with benzodithiophene(BDT) unit and linear dodecyl-BTI unit substituted with 2-octyldodecyl side chain was synthesized using Stille polymerization to construct P1. The novel polymer P2 was synthesized by Suzuki polymerization of carbazole, thiophene as electron rich units, and linear octyl-BTI unit as electron deficient unit to increase conjugation length. Both polymers exhibited thermal stability with glass transition temperature and excellent solubility. The spectra of P1 and P2 solid films show absorption bands with maximum peaks at P1:395, 538 P2:380, 491 nm and the absorption onsets by 652 and 634 nm, akin to band gaps of 1.90 eV, 1.96 eV, likewise. The best device with P1: PC71BM in ODCB with 2% DIO showed VOC of 0.97 V, JSC of 3.06 mA/cm2, and FF of 0.49, which yielded PCE of 1.49%. and the P2:PC71PM (1:2) showed VOC of 0.84 V, JSC of 2.48 mA/cm2, and FF of 0.36, which yielded PCE of 0.76%