Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Synthesis and Photovoltaic Properties of Low Band Gap π-Cojugated Polymer Based on 4,7-Di-thiophen-2-yl-benzo[1,2,5]thiadiazole

4,7-Di-thiophen-2-yl-benzo[1,2,5]thiadiazole을 기본으로 한 고분자의 합성 및 광전변환 특성

  • Shin, Woong (Department of Polymer Engineering, Pukyong National University) ;
  • You, Hyeri (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) ;
  • Jeong, Mi Seon (Department of Polymer Engineering, Pukyong National University) ;
  • Moon, Myung-Jun (Department of Industrial Chemistry, Pukyong National University) ;
  • Kim, Joo Hyun (Department of Polymer Engineering, Pukyong National University)
  • 신웅 (부경대학교 응용화학공학부 고분자공학전공) ;
  • 유혜리 (부경대학교 응용화학공학부 고분자공학전공) ;
  • 박정배 (부경대학교 응용화학공학부 고분자공학전공) ;
  • 박상준 (부경대학교 응용화학공학부 고분자공학전공) ;
  • 정미선 (부경대학교 응용화학공학부 고분자공학전공) ;
  • 문명준 (부경대학교 응용화학공학부 공업화학전공) ;
  • 김주현 (부경대학교 응용화학공학부 고분자공학전공)
  • Received : 2009.01.22
  • Accepted : 2009.07.06
  • Published : 2010.04.10
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Abstract

Poly [4,7-Di-thiophen-2-yl-benzo(1,2,5)thiadiazole]-alt-1,4-bis(dodecyloxy)-2,5-divinylbenzene (PPVTBT) was synthesized by the Heck coupling reaction between 4,7-Di-thiophen-2-yl-benzo(1,2,5)thiadiazole and 1,4-bis(dodecyloxy)-2,5-divinylbenzene. The maximum absorption and band gap of PPVTBT were 550 nm and 1.74 eV, respectively. The HOMO and LUMO energy level of PPVTBT were -5.24 eV and -3.50 eV, respectively. The photovoltaic device based on the blend of PPVTBT and (6)-1-(3-(methoxycarbonyl)propyl)-{5}-1-phenyl[5,6]-$C_{61}$ (PCBM) (1 : 6 by weight ratio) was fabricated. The efficiency of device was 0.16%. The short circuit current density (Jsc), fill factor (FF) and open-circuit voltage (Voc) of the device was $0.74mA/cm^{2}$, 31% and 0.71 V, respectively, under AM 1.5 G and 1 sun condition ($100mA/cm^{2}$).

4,7-Di-thiophen-2-yl-benzo(1,2,5)thiadiazole과 1,4-bis(dodecyloxy)-2,5-divinylbenzene을 Heck coupling 중합법을 이용하여 poly[4,7-Di-thiophen-2-yl-benzo(1,2,5)thiadiazole]-alt-1,4-bis(dodecyloxy)-2,5-divinylbenzene (PPVTBT) 공중합체를 합성하였다. 합성한 PPVTBT의 최대흡수파장과 band gap은 각각 550 nm와 1.74 eV이고 HOMO와 LUMO enegry level은 각각 -5.24 eV, -3.50 eV로 나타났다. 합성한 공중합체인 PPVTBT와 (6)-1-(3-(methoxycarbonyl)propyl)-{5}-1-phenyl[5,6]-$C_{61}$(PCBM)을 1 : 6의 중량비로 blend하여 제작한 소자의 효율은 AM 1.5 G, 1 sun 조건($100mA/cm^{2}$)에서 0.16%의 효율을 보였다. 그리고 소자의 Jsc (short circuit current), FF (fill factor)와 Voc (open circuit voltage)는 각각 $0.74mA/cm^{2}$, 31%, 0.71 V로 나타났다.

Keywords

Acknowledgement

Supported by : 한국연구재단

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