Benzodifuran-containing well-defined pi-conjugated polymers for photovoltaic cells

Li, H. and Tang, P. and Zhao, Y. and Liu, S. X. and Aeschi, Y. and Deng, L. J. and Braun, J. and Zhao, B. and Liu, Y. Q. and Tan, S. T. and Meier, W. and Decurtins, S.. (2012) Benzodifuran-containing well-defined pi-conjugated polymers for photovoltaic cells. Journal of polymer science. A, Polymer chemistry, Vol. 50, H. 14. pp. 2935-2943.

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Official URL: http://edoc.unibas.ch/dok/A6070460

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Two well-defined alternating p-conjugated polymers containing a soluble electroactive benzo[1,2-b:4,5-b']difuran (BDF) chromophore, poly(BDF-(9-phenylcarbazole)) (PBDFC), and poly(BDF-benzothiadiazole) (PBDFBTD) were synthesized via Sonogashira copolymerizations. Their optical, electrochemical, and field-effect charge transport properties were characterized and compared with those of the corresponding homopolymer PBDF and random copolymers of the same overall composition. All these polymers cover broad optical absorption ranges from 250 to 750 nm with narrow optical band gaps of 1.782.35 eV. Both PBDF and PBDFBTD show ambipolar redox properties with HOMO levels of -5.38 and -5.09 eV, respectively. The field-effect mobility of holes varies from 2.9 x 10-8 cm2 V-1 s-1 in PBDF to 1.0 x 10-5 cm2 V-1 s-1 in PBDFBTD. Bulk heterojunction solar cell devices were fabricated using the polymers as the electron donor and [6,6]-phenyl-C61-butyric acid methyl ester as the electron acceptor, leading to power conversion efficiencies of 0.240.57% under air mass 1.5 illumination (100 mW cm-2). These results indicate that their band gaps, molecular electronic energy levels, charge mobilities, and molecular weights are readily tuned by copolymerizing the BDF core with different p-conjugated units. (C) 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2012
Faculties and Departments:05 Faculty of Science > Departement Chemie
05 Faculty of Science > Departement Chemie > Chemie > Makromolekulare Chemie (Meier)
UniBasel Contributors:Meier, Wolfgang P.
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:John Wiley
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:01 Mar 2013 11:14
Deposited On:01 Mar 2013 11:12

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