Abstract
Three new selenophene-based conjugated copolymers having different ratios of the monomeric units were designed, synthesized and thoroughly characterized. The introduction of an electron-poor and surfaced building moiety like selenathiazole was highly efficient in tuning the bandgap and polymer properties. The chalcogenophene-based medium-bandgap polymers demonstrated low-lying HOMO energy levels (∼5.87 eV), which is benign for use in multi-junction polymer solar cell applications. The representative polymers with heavy atoms revealed the change in electronegativity and atomic size that highly affected the molecular property, its topological features, and photovoltaic properties in polymer solar cells. The selenium-substituted (0.5:0.5) polymer donors showed power conversion efficiencies above 3% when combined with [6,6]-phenyl-C71-butyric acid methyl ester (PC70BM) acceptors in a quintessential bulk-heterojunction solar cell.
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Information is available regarding the copolymerization procedure, NMR spectra, UV-Vis spectra and CV spectra, device fabrication details and PDI data. The materials are available via the Internet at http://www.springer.com/13233.
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Acknowledgments: The first two authors equally contributed to this work. This research was conducted in 2019 during the sabbatical research year of Kwangwoon University. This work was supported by Energy Demand Management Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), granted financial resource from Ministry of Trade, Industry & Energy, Republic of Korea (No. 2018201010636A).
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Cho, N.G., Shome, S., Yu, E.S. et al. Impact of Chalcogenophenes on Donor-Acceptor Copolymers for Bulk Heterojunction Solar Cells. Macromol. Res. 28, 1111–1115 (2020). https://doi.org/10.1007/s13233-020-8145-6
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DOI: https://doi.org/10.1007/s13233-020-8145-6