Replacing 2,1,3-benzothiadiazole with 2,1,3-naphthothiadiazole in PCDTBT: towards a low bandgap polymer with deep HOMO energy level
- Author(s)
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Kim, Jonggi, Yun, Myoung Hee, Kim, Gi-Hwan, Kim, Jin Young, Yang, Changduk
- Issued Date
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2012-12
- DOI
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10.1039/c2py20488f
- URI
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https://scholarworks.unist.ac.kr/handle/201301/2713
- Fulltext
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http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84868356783
- Citation
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POLYMER CHEMISTRY, v.3, no.12, pp.3276 - 3281
- Abstract
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With the rising 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 an 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 lambda(max) position of PCDTNT is significantly red-shifted by similar to 30 nm, corresponding to a lower optical bandgap (1.71 eV) from the absorption edge of the thin film than that of PCDTBT (1.88 eV). A bulk-heterojunction (BHJ) PSC that incorporated PCDTNT with the low-lying HOMO energy level as a p-type material delivers a higher V-OC value of 0.81 V and a power conversion efficiency (PCE) value of 1.31%.
- Publisher
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ROYAL SOC CHEMISTRY
- ISSN
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1759-9954
- Keyword
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HETEROJUNCTION SOLAR-CELLS, PHOTOVOLTAIC CELLS, TANDEM POLYMER, EFFICIENCY, DONOR, DERIVATIVES, MORPHOLOGY, NETWORK
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