화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Polymer(Korea), Vol.39, No.6, 986-992, November, 2015
DOI10.7317/pk.2015.39.6.986  Export Citation
플루오렌 혹은 카바졸 기반의 유기태양전지용 고분자 도너의 비교 연구
Comparative Study of Fluorene- and Carbazole-based Polymer Donors for Organic Photovoltaic Cells
엄윤호, 임은희†
  • 경기대학교 화학과
Yoonho Eom, and Eunhee Lim†
  • Department of Chemistry, Kyonggi University, San 94-6, Iui-dong, Yeongtong-gu, Suwon-si, Gyeonggi 443-760, Korea
E-mail:
초록
본 연구에서는, 트리아졸을 가지는 플루오렌 및 카바졸 기반의 두 공중합체(PFT2Tz와 PCzT2Tz)를 스즈키 짝지음 반응을 이용하여 합성하였고, 1H NMR로 이들의 구조를 확인하였다. 두 공중합체는 클로로포름이나 클로로벤젠과 같은 일반적인 유기용매에서 용해도가 좋았으며, 300 oC까지 열 안정성을 가진다. GPC, TGA, CV, UV-vis 분광분석기를 이용하여 두 공중합체의 물리적 특성을 조사하였다. PFT2Tz와 PCzT2Tz의 HOMO 준위는 각각 -5.37 eV 과 -5.32 eV로 나타났다. 더 중요하게, PFT2Tz와 비교했을 때, PCzT2Tz 필름은 더 넓고 더 장파장에서 UV-vis 흡수를 나타내었다. 합성한 공중합체를 전자주게로 사용하여 ITO/PEDOT:PSS/공중합체:PC71BM/LiF/Al의 구조로 유기태양전지 소자를 제작하여 그 광전 특성을 조사하였다. PCzT2Tz은 2.79 mA/cm2의 단락전류(JSC)와 0.68 V의 개방전압(VOC)과 광전변환효율(PCE) 0.67%를 나타내었고, 이는 같은 조건에서 제작된 PFT2Tz 보다 높은 효율이다 (PCE = 0.57%, JSC= 2.16 mA/cm2, VOC = 0.83 V, FF = 0.32). PFT2Tz의 상대적으로 높은 개방전압은 낮게 위치하는 HOMO 에너지 준위에 의한 것이다. PCzT2Tz의 높은 광전변환효율은 증가된 UV 흡수로 인한 높은 단락전류 때문이다.
We synthesized two triazole-substituted fluorene- and carbazole-based copolymers PFT2Tz and PCzT2Tz by Suzuki-coupling reaction and characterized them with 1H NMR. The physical properties of the copolymers were investigated with GPC, TGA, CV, and UV-vis absorption spectroscopy. The HOMO energy levels of PFT2Tz and PCzT2Tz were -5.37 and -5.32 eV, respectively. More importantly, PCzT2Tz film had a broader, red-shifted UV absorption than the PFT2Tz. The organic photovoltaic cells were fabricated with a configuration of ITO/PEDOT:PSS/copolymer:PC71BM/LiF/Al using the copolymers as donors. PCzT2Tz showed the higher power conversion efficiency (PCE) of 0.67% (JSC= 2.79mA/cm2, VOC = 0.68 V), compared to PFT2Tz (PCE = 0.57%, JSC = 2.16mA/cm2, VOC = 0.83 V). The relatively high open-circuit voltage of the PCzT2Tz came from the low-lying HOMO level of the PCzT2Tz donor. The higher PCE of PCzT2Tz can be explained by its relatively improved UV absorption and thus higher short-circuit currents.
Keywords:organic solar cells (OPV);conjugated polymer;fluorene;carbazole
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