Synthesis and characterization of new low bandgap polyfluorene copolymers for bulk heterojunction solar cells |
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| Authors: | Steve Lien‐Chung Hsu Yu‐Chen Lin Rong‐Fong Lee Chinnaiah Sivakumar Jen‐Sue Chen Wei‐Yang Chou |
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| Institution: | 1. Department of Materials Science and Engineering, National Cheng‐Kung University, Tainan, 701‐01, Taiwan, Republic of China;2. Institute of Electro‐Optical Science and Engineering, National Cheng‐Kung University, Tainan, 701‐01, Taiwan, Republic of China |
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| Abstract: | Two new low bandgap alternating polyfluorene copolymers based on dioctylfluorene and donor‐acceptor‐donor monomers have been synthesized via a Suzuki polymerization reaction. The resulting copolymers have low optical bandgaps at 1.99–1.98 eV. The bulk heterojunction polymer solar cells were fabricated with the conjugated polymers as the electron donor and 6.6‐phenyl C61‐butyric acid methyl ester as the electron acceptor. The power conversion efficiencies of the solar cells based on copolymers 1 and 2 are 0.37 and 0.42%, respectively, under the illumination of AM 1.5, 100 mW/cm2. The results indicate that the two copolymers are promising conjugated polymers for polymer solar cells. © 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 5336–5343, 2009 |
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| Keywords: | charge transfer conjugated polymers copolymerization low bandgap solar cells synthesis |
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