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Yang, Changduk
Advanced Tech-Optoelectronic Materials Synthesis Lab (ATOMS)
Research Interests
  • Optoelectronic materials synthesis/organic electronics, functionalization of carbonaceous solids, advanced materials chemistry, macromolecular chemistry

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Copolymers Comprising 2,7-Carbazole and Bis-benzothiadiazole Units for Bulk-Heterojunction Solar Cells

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Title
Copolymers Comprising 2,7-Carbazole and Bis-benzothiadiazole Units for Bulk-Heterojunction Solar Cells
Author
Kim, JonggiYun, Myoung HeeAnant, PiyushCho, ShinukJacob, JosemonKim, Jin YoungYang, Changduk
Keywords
2 ,1 ,3-Benzothiadiazole; 2 ,7-carbazole; Band gaps; bis-benzothiadiazole; Bulk heterojunction; carbazole; Donor-acceptor system; Electron acceptor; Electron-deficient; Electron-rich; Fullerene derivative; Intramolecular charge transfers; Photovoltaic characteristics; Photovoltaic response; Power conversion efficiencies; Resulting materials; Solar light
Issue Date
201112
Publisher
WILEY-V C H VERLAG GMBH
Citation
CHEMISTRY-A EUROPEAN JOURNAL, v.17, no.51, pp.14681 - 14688
Abstract
On the basis of theoretical considerations of the intramolecular charge transfer (ICT) effect, we have designed a series of donor (D)-acceptor (A) conjugated polymers based on bis-benzothiadiazole (BBT). A PPP-type copolymer of electron-rich 2,7-carbazole (CZ) and electron-deficient BBT units poly[N-(2-decyltetradecyl)2,7-carbazole-co-7,7'-{4,4'-bis-(2,1,3benzothiadiazole)}] (PCZ-BBT), a PPV-type copolymer poly[N-(2-decyltetradecyl)-2,7-carbazolevinylene-co-7,7'{4,4'-bis-(2,1,3-benzothiadiazolevinylene)}] (PCZV-BBTV), and a tercopolymer based on carbazole, thiophene, and BBT poly[N-(2-decyltetradecyl)2,7-(di-2-thienyl) carbazole-co-7,7'-{4,4'bis-(2,1,3-benzothiadiazole)}] (PDTCZ-BBT) have been synthesized to understand the influence of BBT acceptor structure and linkage on the photovoltaic characteristics of the resulting materials. Both the HOMO and LUMO of the resulting polymers are found to be deeper-lying than those of benzothiadiazole-based polymers. The measured electrochemical band gaps (eV) are in the following order: PDTCZ-BBT (1.65 eV) < PCZV-BBTV (1.69 eV) < PCZ-BBT (1.75 eV). All the polymers provide a photovoltaic response when blended with a fullerene derivative as an electron acceptor. The best cell reaches a power conversion efficiency of 2.07% estimated under standard solar light conditions (AM1.5G, 100 mWcm(-2)). We demonstrate for the first time that BBT-based polymers are promising materials for use in bulk-heterojunction solar cells.
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DOI
http://dx.doi.org/10.1002/chem.201101258
ISSN
0947-6539
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