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제114회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Synthesis and Properties of Low Bandgap Star Molecules for Solution Processed Bulk Heterojunction Organic Solar Cells

2014년 8월 28일 15시 49분 21초
INOR.P-237 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 15일 (수요일) 16:00~19:00
저자 및
심장근, 도광석1, 최혜주1, 박소진1, 김기동2, 고재중1,*
고려대학교 세종캠퍼스 신소재화학과, Korea
1고려대학교 소재화학과, Korea
2고려대학교 세종캠퍼스 소재화학과, Korea
Two symmetrical planar star shaped organic small molecules TPA[DTS-PyBTTh3]3 (1) and DMM-TPA[DTS-PyBTTh3]3 (2) with TPA and fused TPA core donors, respectively and three branched DTS-PyBTTh3 units were synthesized and characterized. These small molecules were used donor materials along with PC71BM acceptor for solution processed bulk heterojunction (BHJ) solar cells. The power conversion efficiency (PCE) of the solar cells based on 1 and 2 are about 2.87% and 3.83%, respectively, when the active layers were processed from chlorobenzene (CB) solvent. The higher PCE of the solar cell based on 1 may be attributed to its low bandgap and broad absorption profile as compared to 2. The PCE of the solution processed BHJ solar cells was improved up to 3.88% and 5.81% for 1 and 2, respectively, when active layers were processed with 0.4% (v/v) 1-chloronaphthalene (CN) as additive in the CB solvent. The enhancement in the PCE was mainly due to the increase in Jsc and FF. The increase in the Jsc and FF may be attributed to the balance charge transport between the electron and hole transport and reduction in the bimolecular recombination, leading to an increase in the PCE.