Replacing 2,1,3-benzothiadiazole with 2,1,3-naphthothiadiazole in PCDTBT towards low bandgap polymer with low-lying HOMO energy level
- Author(s)
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Yang, Changduk, 김종기, 윤명희, 김기환, 김진영
- Issued Date
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2012-10-11
- URI
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https://scholarworks.unist.ac.kr/handle/201301/43103
- Citation
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2012년 한국고분자학회 추계총회 및 연구논문발표회, v.37, no.2
- Abstract
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With the rise in interest in using the medium bandgap polymer, poly(2,7-carbazole-alt-4,7-dithienyl-2,1,3-benzothiadiazole) (PCDTBT) with deep HOMO energy level for polymer solar cells (PSCs), we have developed its analogous polymer with a lower bandgap, namely, poly(2,7-carbazole-alt-4,7-dithienyl-2,1,3-naphthothiadiazole) (PCDTNT) by replacing 2,1,3-benzothiadiazole (BT) with 2,1,3-naphthothiadiazole (NT) in PCDTBT. Its optical, electrochemical, and photovoltaic properties are fully characterized in comparison with PCDTBT. Clearly, the max position of PCDTNT is significantly red-shifted by ~ 30 nm, corresponding to a lower optical bandgap (1.71 eV) from the absorption edge of the thin film than PCDTBT (1.88 eV). A bulk-heterojunction (BHJ) PSC that incorporated PCDTNT with the low-lying HOMO energy level as a p-type mateial delivers a higher VOC value of 0.81 V and a power conversion efficiency (PCE) value of 1.31%.
- Publisher
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한국고분자학회
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