Synthesis and photovoltaic properties of a furan-diketopyrrolopyrrole-fluorene terpolymer |
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Authors: | Ganapathy Balaji Mehran Samiee Esfahani Pranav Joshi Joydeep Bhattacharaya Malika Jeffries-EL Vikram Dalal |
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Affiliation: | 1. Microelectronics Research Center, Iowa State University, Ames 50011, USA;2. Department of Chemistry, Iowa State University, Ames 50011, USA |
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Abstract: | We report the synthesis of two solution-processable reduced band gap donor–acceptor conjugated polymers p(C8-DPP-F) and p(C12-DPP-F), composed from 9,9-dioctylfluorene as the donor moiety, diketopyrrolopyrrole (DPP) moiety as the acceptor moiety and furan bridges. Two different alkyl chains, n-dodecyl and n-octyl were used on the DPP moiety and the impact of this structural modification evaluated in detail. Both polymers exhibited similar optical and electrochemical properties with optical band gap of around 1.75 eV as result of LUMO levels near −3.4 eV and high-lying HOMO levels of ∼5.2 eV. Bulk heterojunction photovoltaic devices using these polymers electron donors along with PC70BM as the electron acceptor, gave power conversion efficiency of 1.60% and 0.75% for p(C12-DPP-F) and p(C8-DPP-F) respectively. |
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Keywords: | Conjugated polymers Organic photovoltaics Donor&ndash acceptor system Optical properties Electrochemical properties SCLC |
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