Synthesis and characterization of low‐bandgap cyclopentadithiophene‐biselenophene copolymer and its use in field‐effect transistor and polymer solar cells |
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| Authors: | Sang Kyu Lee Nam Sung Cho Shinuk Cho Sang‐Jin Moon Jae Kwan Lee Guillermo C Bazan |
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| Institution: | 1. Center for Polymers and Organic Solids, University of California at Santa Barbara, California 93106;2. Energy Materials Research Center, Korea Research Institute of Chemical Technology (KRICT), 100 Jang‐dong, Yuseong‐gu, Daejeon 305‐600, Korea |
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| Abstract: | Novel series of conjugated copolymers, incorporating cyclopentadithiophene (CPDT) and the biselenophene ( R‐CPDT‐Se2 ), were synthesized by Pd‐catalyzed Stille coupling polymerization. The optical, electrochemical, field‐effect carrier mobilities, and photovoltaic properties of the R‐CPDT‐Se2 were investigated and compared with cyclopentadithiophene (CPDT) and the bithiophene ( EHex‐CPDT‐T2 ). The highest hole mobility of thin film transistor devices fabricated with new p‐type polymer semiconductors, Oct‐CPDT‐Se2 , was 1.3 × 10?3 cm2/Vs with an on/off ratio of about 105. The maximum power conversion efficiency of polymer solar cell fabricated with the blend of EHex‐CPDT‐Se2 /C71‐PCBM reached 1.86% with an open circuit voltage (VOC) of 0.55 V, a short circuit current density (Jsc) of 7.27 mA/cm2, and a fill factor (FF) of 0.47 under AM 1.5G irradiation (100 mW/cm2). © 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2009 |
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| Keywords: | conjugated polymers nanocomposites photoreactive effects |
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