Proceedings of 13th Conference on Hybrid and Organic Photovoltaics (HOPV21)
Publication date: 11th May 2021
In this study, well-defined ABA triblock copolymers [poly(methyl methacrylate)]2-block-poly(ethylene glycol) with various copolymer compositions and molar masses are synthesized by RAFT polymerization using bifunctional PEG-macro chain transfer agent (MCTA) in a one-step reaction. Due to the high reactivity and toxicity of sulfur-containing trithiocarbonate end groups, ABA triblock copolymers prepared from RAFT polymerization are further modified to sulfur-free 2-methylpropionitrile and 4-cyanopentanoic acid end functional triblock copolymers by radical-induced transformation reactions. Among three different end functional polymers, carboxylic acid end functional triblock copolymer is the highest thermally stable polymer. The highest power conversion efficiency (PCE) for QSS-DSSCs under simulated 1-sun illumination is achieved up to 10.34%, which is comparable with the highest PCE of 10.39% for LE-DSSCs. The comparable efficiency for QSS-DSSCs is mainly due to the improvement of Jsc. The Jsc value of QSS-DSSCs increases with increasing polymer concentration in gel electrolytes which could be attributed to the increase of electron injection efficiency (Фinj). Based on the photovoltaic performance, stability, and considering the environmental issues, high reactivity, and UV-absorption of trithiocarbonate end groups, carboxylic acid end functional SGT-643-C polymer can be one of the best promising gel materials for flexible quasi-solid state dye-sensitized solar cells.
This work was supported by the Korean government (Ministry of Science, ICT and Future Planning) through the Technology Development Program to Solve Climate Changes (NRF-2016M1A2A2940912) and “Human Resources Program in Energy Technology” of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea. (No. 20204030200070).
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