Wide and Narrow Bandgap Conjugated Polymers Synthesized by a Direct Arylation Polycondensation Method for Ternary Organic Solar Cells

Keshtov, M.L.; Kalinkin, D.P.; Antoshkina, E.; Dahiya, H.; Karak, S.; Singh, M.K.; Sharma, G.D.

Авторы: Keshtov Mukhamed L., Kalinkin D.P., Antoshkina Evgenia, Dahiya Hemraj, Karak Supravat, Singh Manish K., Sharma Ganesh D.
Журнал: ACS Applied Polymer Materials
Том: 7
Номер: 17
Год издания: 2025
Издательство: American Chemical Society
Местоположение издательства: United States
Первая страница: 11154
Последняя страница: 11163
DOI: 10.1021/acsapm.5c01615
Аннотация: In this study, we report the synthesis of two A1−D−A2−D-type conjugated polymers P139 and P141 with distinct optical bandgaps, prepared via direct arylation polycondensation. Both polymers incorporate a common wide-bandgap acceptor unit (A1) based on a carbazole-fused dithienoquinoxaline structure and a thiophene donor (D) unit. The key difference lies in their second acceptor unit (A2). P139 contains a diketopyrrolopyrrole-based moiety, while P141 features a difluorobenzotriazole-based fragment. Optical and electrochemical characterizations reveal that P139 exhibits a narrow bandgap of 1.34 eV with HOMO and LUMO energy levels at −5.25 eV and −3.68 eV, respectively. In contrast, P141 shows a wider bandgap of 2.00 eV, with HOMO and LUMO levels at −5.46 eV and −3.47 eV. Binary and ternary organic solar cells (OSCs) were fabricated using these polymers as donor materials in combination with a medium-bandgap non-fullerene acceptor (NFA-5). The optimized ternary device, based on a P139:P141:NFA-5 blend, delivered a power conversion efficiency (PCE) of 16.42%, significantly outperforming the binary devices, which achieved 12.12% (P139:NFA5) and 9.48% (P141:NFA5). The enhanced performance of the ternary OSC is attributed to broadened and complementary absorption, efficient energy transfer from P141 to P139, improved exciton dissociation due to an increased donor−acceptor interfacial area, balanced charge transport, reduced recombination losses, and improved charge extraction.
Добавил в систему: Калинкин Дмитрий Петрович

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Wide and Narrow Bandgap Conjugated Polymers Synthesized by a Direct Arylation Polycondensation Method for Ternary Organic Solar Cellsстатья Исследовательская статья

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