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Received August 23, 2010
Accepted September 30, 2010
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Phenylene-Thiophene-Thieno[3,4-b]pyrazine 올리고머의 합성과 특성
Synthesis and Characterization of Phenylene-Thiophene-Thieno[3,4-b]pyrazine Oligomer
전북대학교 화학공학부, 561-756 전북 전주시 덕진구 덕진동 1가 664-14
Division of Chemical Engineering, Chonbuk National University, 664-14 1 Ga, Duckjin-dong, Duckjin-gu, Jeonju-si, Jeonbuk 561-756, Korea
Korean Chemical Engineering Research, February 2011, 49(1), 95-100(6), NONE Epub 9 February 2011
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Abstract
본 연구에서는 유기 태양전지용 작은 밴드 갭 물질(p-형 반도체)의 개발 과정에서, 2,5-dioctyloxyphenylene(OP), 3-hexylthiophene(HT) 및 2,3-dimethylthieno[3,4-b]pyrazine(TP)을 반복단위로 갖는 올리고머(oligo(OP-HT-TP))를 합성하였다. Oligo(OP-HT-TP)는 측정 온도 범위에서 무정형 상태로 존재하였으며, 범용 유기용매에 잘 용해되었다. 필름상태에서 최대 흡수 파장은 716 nm이었으며, 밴드 갭은 대략 1.20 eV로 측정되었다. Oligo(OP-HT-TP)의 HOMO와 LUMO의 에너지 준위는 각각 -5.27 eV와 -4.04 eV로 측정되었다. 그러나, 이 올리고머의 최대 흡수 파장에서 흡광도는 유기태양전지의 제작에 있어서 현재까지 가장 많이 사용되고 있는 poly(3-hexylthiophene) 흡광도의 1/5보다도 더 작은 것으로 측정되었다.
During the development of low band-gap organic materials(p-type semiconducting organic compounds) for organic solar cells, an oligomer consisting of 2,5-dioctyloxyphenylene(OP), 3-hexylthiophene(HT), and 2,3-dimethylthieno[3,4-b]pyrazine(TP) as repeat units, oligo(OP-HT-TP), was synthesized. The oligomer was amorphous in nature in the temperature range studied, and well soluble in common organic solvents such as chloroform. The maximum absorption wavelength was 716 nm in solid state. The band-gap and HOMO/LUMO energy levels of oligo(OP-HT-TP) were measured to be 1.20 eV and -5.27/4.04 eV, respectively. However, the absorbance of the oligomer at maximum absorption wavelength was less than one fifth of that of poly(3-hexylthiophene) which has been most frequently used in fabrication of organic solar cells.
Keywords
References
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