Efficient ternary organic photovoltaic device with a non-halogenated solvent via synergistic inhibiting charge recombination and regulating morphology
Journal of Materials Chemistry C(2023)
Abstract
Environmentally friendly and efficient organic photovoltaic (OPV) devices play an essential role in commercial applications. Herein, the PM6:TBFCl50-BDD:IT-4F-based ternary device was fabricated using the non-halogenated solvent o-xylene (o-XY), and a third component (TBFCl50-BDD) that is similar to the PM6 structure. It was found that the addition of 20 wt% TBFCl50-BDD enhanced the crystallinity of the ternary blend film and significantly improved the charge transport and collection ability, which could effectively suppress trap-assisted recombination and bimolecular recombination. Meanwhile, the introduction of TBFCl50-BDD accelerated the diffusion of excitons to the donor-acceptor interface and promoted exciton dissociation. Ultimately, the ternary device achieved a power conversion efficiency (PCE) of 12.8%, which is higher than that of the PM6:IT-4F binary device (11.8%).
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Key words
charge recombination,solvent,non-halogenated
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