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- W3159115905 abstract "Herein, a new polymer o-PBTA-PSF (P1) is synthesized with a donor unit 4,8-bis(2-fluoro-4-((2-hexyldecyl)thio)phenyl)benzo[1,2-b:4,5-b']dithiophene containing the fluorine atoms (named o-BDTPSF) and an acceptor unit 4,7-bis(5-bromothiophen-2-yl)-5,6-difluoro-2-(2-hexyldecyl)–2H-benzo[d][1,2,3]triazole. However, a low power conversion efficiency (PCE) of 6.46% is obtained for P1:ITIC-based devices. The poor performance ascribes to the strong aggregation originating from the conformational locking in the polymer backbone. Hence, we employ the random ternary polymerization strategy to synthesize a series of donor polymers to weaken the conformational locking and achieve excellent photovoltaic performance. The terpolymer P4 obtains the optimal PCE of 13.26% with an incorporation of 30% BDTPS, a similar structure of o-BDTPSF, into the P1 polymer backbone. This significant improvement benefits from the enhanced JSC and FF, resulting from the appropriate aggregation and better phase separation in the active layer. These results indicate that the photovoltaic performance could be improved through the strategy of random copolymerization and conformational control." @default.
- W3159115905 created "2021-05-10" @default.
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- W3159115905 date "2021-10-01" @default.
- W3159115905 modified "2023-10-16" @default.
- W3159115905 title "Weakening conformational locking for fine tuning of morphology and photovoltaic performance by introducing a third component" @default.
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- W3159115905 doi "https://doi.org/10.1016/j.cej.2021.130097" @default.
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