Effect of Alkylsilyl Side-Chain Structure on Photovoltaic Properties of Medium Bandgap Conjugated Polymer Donor
Haijun Bin a, Martijn M. Wienk a, Rene A. J. Janssen a
a Molecular Materials and Nanosystems, Eindhoven University of Technology, Netherlands, Netherlands
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
Benidorm, Spain, 2018 May 28th - 31st
Organizers: Emilio Palomares and Rene Janssen
Poster, Haijun Bin, 270
Publication date: 21st February 2018

Side-chain engineering is an important strategy for optimizing photovoltaic properties of organic photovoltaic materials, the type, size, topology, and distribution of side chains have a great impact on the photovoltaic parameters of the corresponding organic solar cells (OSCs)[1-3]. It has been demonstrated that introducing an tri-n-propylsilyl side chain in a benzodithiophene-alt-fluorobenzotriazole (BDT-alt-FBTA) based polymer J71, effectively down-shifted the HOMO energy level, increased the absorption coefficient, and enhanced hole mobility of the corresponding polymer, leading to excellent photovoltaic properties for a blend with the non-fullerene acceptors ITIC and m-ITIC[4,5]. Here we designed and synthesized a new polymer donor J75 which with branched alkylsilyl side chains, and studied the photovoltaic properties by fabricating OSCs with the polymer as donor and ITIC as acceptor. It was found the OSCs based on J75:ITIC can achieve a power conversion efficiency (PCE) of 10.40% with a high open-circuit voltage (Voc) of 0.98 V, a short-circuit current density (Jsc) of 16.40 mA cm−2 and a fill factor (FF) of 65% without any extra treatment.

 

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