Synthesis and photovoltaic behaviors of narrow‐band‐gap π‐conjugated polymers composed of dialkoxybenzodithiophene‐ and thiophene‐based fused aromatic rings |
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| Authors: | Kwang‐hoi Lee Ho‐Jin Lee Kazuhide Morino Atsushi Sudo Takeshi Endo |
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| Institution: | 1. Molecular Engineering Institute, Kinki University, 11‐6 Kayanomori, Iizuka, Fukuoka Prefecture, 820‐8555, Japan;2. Research Fellow Laboratories Yokkaichi, JSR Corporation, 100 Kawajiri‐cho, Yokkaichi, Mie Prefecture 510‐8552, Japan |
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| Abstract: | π‐Conjugated polymers, PBDT‐CNETT and PBDT‐CNECPDT , were prepared by the Stille cross‐coupling polymerization. Optical and thermal properties of the obtained polymers were investigated by UV–vis spectroscopy and thermogravimetric analysis. PBDT‐CNETT and PBDT‐CNECPDT exhibited very narrow band gaps of 1.39 and 1.13 eV, respectively. Highest occupied molecular orbital energy levels estimated by surface analyzer were ?5.17 and ?5.11 eV for PBDT‐CNETT and PBDT‐CNECPDT , respectively. The solar cells based on these polymers were evaluated with the cell configuration of ITO/PEDOT‐PSS/polymer:PC61BH/LiF/Al. The power conversion efficiencies of the solar cells were estimated to be 1.57 and 0.16% for PBDT‐CNETT and PBDT‐CNECPDT , respectively. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011 |
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| Keywords: | π ‐conjugated polymer conjugated polymers copolymerization heteroatom‐containing polymers low band gap photovoltaic cell polymer solar cell |
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