For photovoltaic biointerfaces AgBiS2 quantum dots (QDs) offer favorable properties such as two-orders of magnitude higher absorption coefficient at near-infrared (NIR) in comparison with silicon for ultra-thin and flexible device formation and non-toxic material content. We demonstrate AgBiS2 QD based photovoltaic biointerface that stimulates cells within the spectral tissue transparency window by using NIR light (λ = 780 nm). The biointerface converts light energy below the ocular safety limit of light exposure to safe capacitive photocurrents that leads to reproducible action potentials on primary hippocampal neurons with high success rates.
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