Synthesis and Photovoltaic Properties of New π-conjugated Polymers Based on 2,3-dimethyl-5,8-dithiophen-2-yl-quinoxaline

2,3-Dimethyl-5,8-dithiophen-2-yl-quinoxaline을 기본 골격으로 한 새로운 고분자 물질의 합성 및 광전변환특성

  • Shin, Woong (Department of Polymer Engineering, Pukyong National University) ;
  • Park, Jeong Bae (Department of Polymer Engineering, Pukyong National University) ;
  • Park, Sang Jun (Department of Polymer Engineering, Pukyong National University) ;
  • Jo, Mi Young (Department of Polymer Engineering, Pukyong National University) ;
  • Suh, Hongsuk (Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University) ;
  • Kim, Joo Hyun (Department of Polymer Engineering, Pukyong National University)
  • 신웅 (부경대학교 응용화학공학부 고분자공학과) ;
  • 박정배 (부경대학교 응용화학공학부 고분자공학과) ;
  • 박상준 (부경대학교 응용화학공학부 고분자공학과) ;
  • 조미영 (부경대학교 응용화학공학부 고분자공학과) ;
  • 서홍석 (부산대학교 화학과) ;
  • 김주현 (부경대학교 응용화학공학부 고분자공학과)
  • Received : 2010.07.01
  • Accepted : 2010.08.27
  • Published : 2011.02.10

Abstract

Poly[2,3-dimethyl-5,8-dithiophene-2-yl-quinoxaline-alt-9,9-dihexyl-9H-fluorene] (PFTQT) and poly[2,3-dimethyl-5,8-dithiophen-2-yl-quinoxaline-alt-10-hexyl-10H-phenothiazine (PPTTQT) based on 2,3-dimethyl-5,8-dithiophen-2-yl-quinoxaline weresynthesized by Suzuki coupling reaction. All polymers were soluble in common organic solvents such as chloroform, chlorobenzene, o-dichlorobenzene, tetrahydrofuran (THF) and toluene. The maximum absorption wavelength and band gap of PFTQT were 440 nm and 2.30 eV, and PPTTQT were 445 nm and 2.23 eV, respectively. The HOMO and LUMO energy level of PFTQT were -6.05 and -3.75 eV, and PPTTQT were -5,89 and -3.66 eV, respectively. The organic photovoltaic devices based on the blend of polymer and PCBM (1 : 2 by weight ratio) were fabricated. Efficiencies of devices were 0.24% (PFTQT) and 0.16% (PPTTQT), respectively. The short circuit current density ($J_{sc}$), fill factor (FF), and open circuit voltage ($V_{oc}$) of the device with PFTQT were $0.97mA/cm^2$, 29% and 0.86 V, and the device based on PPTTQT were $0.80mA/cm^2$, 28% and 0.71 V, 31% and 0.71 V, respectively, under air mass (AM) 1.5 G and 1 sun condition ($100mA/cm^2$).

Acknowledgement

Supported by : 한국연구재단, 교육과학기술부

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