A phenylenevinylene‐thiophene‐phenyleneethynylene copolymer: synthesis,characterization, and photovoltaic properties |
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| Authors: | Yingping Zou Zhan'ao Tan Lijun Huo Yongfang Li |
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| Institution: | 1. Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing 100080, China;2. Graduate University of Chinese Academy of Sciences, Beijing 100039, China |
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| Abstract: | A phenylenevinylene‐thiophene‐phenyleneethynylene copolymer, poly{1′,4′‐bis‐(thienyl‐vinyl)]‐2‐methoxy‐5‐(2′‐ethylhexyloxy)‐1,4‐phenylene‐vinylene‐alt‐1,4‐dioctyloxyl‐phenyleneethynylene}(PTPPV‐ PPE), was synthesized by the Sonogashira Pd‐catalyzed cross‐coupling reaction. The copolymer possesses higher thermal decomposition temperature (Td = 382°C) compared with poly{1′,4′‐bis‐ (thienyl‐vinyl)]‐2‐methoxy‐5‐(2′‐ethylhexyloxy)‐1,4‐phenylene‐vinylene} (PTPPV). The absorption and photoluminescence (PL) peaks of PTPPV‐PPE solution and solid film locate in between those of the homopolymers of PTPPV and poly(1,4‐dioctyloxyl‐phenyleneethynylene) (PPE), and closer to that of PTPPV. Photovoltaic cell was fabricated based on the blend of PTPPV‐PPE and PCBM with a weight ratio of 1:1. The primary result shows an open circuit voltage (Voc) of 0.72 V which is higher than that of the PTPPV (0.67 V), and a power conversion efficiency (PCE) of 0.3% under the illumination of AM1.5, 100 mW/cm2 which is much better than that of PPEs. Copyright © 2008 John Wiley & Sons, Ltd. |
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| Keywords: | conjugated polymers synthesis optical properties polymer solar cell |
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