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제114회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Synthesis and Characterization of New Benzothiadiazole Derivative as a Electron Acceptor Unit for Organic Photovoltaic cells

등록일
2014년 8월 28일 15시 44분 33초
접수번호
1128
발표코드
POLY.P-59 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
10월 15일 (수요일) 16:00~19:00
발표형식
포스터
발표분야
고분자화학
저자 및
공동저자
김희수, 김지훈1, 황도훈*
부산대학교 화학과, Korea
1부산대학교, Korea
We synthesized two fused pentacyclic donor-acceptor structures where the two different outer electron rich thiophene (DTPBT) and electron poor benzene (ICTh) moieties are covalently fastened with the central electron-deficient benzothiadiazole core by two nitrogen bridges. These new electron-acceptor DTPBT and ICTh building blocks were copolymerized with fluorene as the electron donor part via Suzuki coupling polymerization to afford two new alternating copolymers PFDTPBT, PFICTh, respectively. The average molecular weights of the synthesized polymers were determined by GPC. The number-average molecular weight of PFDTPBT and PFICTh were 19,000 (PDI= 2.5) and 20,000 (PDI= 4.0), respectively. The optical bandgap energies of the polymers were measured from their absorption onsets to be 2.15 and 2.55 eV depending on the polymer structure. The HOMO energy levels of the polymers were determined by measuring the oxidation onsets of the polymer films by cyclic voltammetry. The measured HOMO energy levels of PFDTPBT and PFICTh were -5.10 and -5.57 eV, respectively. When the polymers were blended with PC71BM as active layer for bulk-heterojunction photovoltaic devices, power conversion efficiency were 2.08 % and 0.34 %, respectively, under AM 1.5 G (100 mW/cm²) conditions.

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