Novel DÀ A-π-A type organic sensitizers (YS-1 & YS-2) with spiro[fluorene-9,9'-thioxanthene]-10',10'-dioxide as an auxiliary acceptor were synthesised and effectively fabricated in dye-sensitised solar cells (DSSCs). The sensitizer structures were modified by introducing an auxiliary acceptor of spiro [fluorene-9,9'-thioxanthene]-10',10'-dioxide between the donor and the π-bridge moieties. The bulky auxiliary acceptor can suppress intermolecular aggregation, and the sulfone group can enhance Li + ions trapping to retard charge recombination. The sensitizer YS-2 performed power conversion efficiency of 4.21% under AM1.5 solar condition. Both YS-1 and YS-2 displayed higher light conversion efficiency than N719 in the wavelength range of 300 ~500 nm. Therefore, mixing N719 with YS-2 in a co-sensitized test displayed an efficiency of 8.66% under one sun (AM 1.5G). While operated under CWF and TL84 indoor light, the efficiency was boosted to 22.45% and 24.72%, respectively, at 2500 lux illumination. The high co-sensitization performance of mixing N719 and YS-2 can be ascribed to the high absorption efficiency of YS-2 at short-wavelength, which is a shortcoming of N719 sensitizer. The high performance of N719 and YS-2 co-sensitization is mainly due to a better surface coverage on TiO 2 surface. The durability test of the device cosensitized with N719 and YS-2 showed a mild decay of PCE from 24.7% to 16.8% (68% maintenance) after 336 h in ambient atmosphere without encapsulation. In a comparison, the device made with bare-N719 starting with a PCE of 19.49% dropped to 3.87% (20% maintenance) under the same condition.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.