Copolymers Comprising 2,7-Carbazole and Bis-benzothiadiazole Units for Bulk-Heterojunction Solar Cells
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...
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Published in | Chemistry : a European journal Vol. 17; no. 51; pp. 14681 - 14688 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Weinheim
WILEY-VCH Verlag
16.12.2011
WILEY‐VCH Verlag Wiley Wiley Subscription Services, Inc |
Subjects | |
Online Access | Get full text |
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Summary: | 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‐(2,1,3‐benzothiadiazole)}] (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 mW cm−2). We demonstrate for the first time that BBT‐based polymers are promising materials for use in bulk‐heterojunction solar cells.
Influence on photovoltaic characteristics: A family of donor (D)–acceptor (A) conjugated polymers based on bis‐benzothiadiazole (BBT), namely PCZ‐BBT, PCZV‐BBTV, and PDTCZ‐BBT, are presented for use in bulk‐heterojunction solar cells. Both the HOMO and LUMO of the resulting polymers are found to be deeper lying than those of benzothiadiazole‐based polymers. |
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Bibliography: | istex:E9A442D1849BDD2369D3A0E3EC802E9D3FEC46E1 Korean Government (MEST) - No. 2010-0019408; No. 2010-0026916; No. 2009-0093818; No. 2010-0026163 ark:/67375/WNG-8S65MMML-B National Research Foundation of Korea (NRF) ArticleID:CHEM201101258 Ministry of Education, Science and Technology - No. (2010-0002494) Basic Science Research Program the National Research Foundation of Korea Grant ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0947-6539 1521-3765 |
DOI: | 10.1002/chem.201101258 |