Proceedings of nanoGe Fall Meeting 2018 (NFM18)
Publication date: 6th July 2018
The electrical conversion and storage of solar energy is a crucial target for assuring the deployement of renewal energy sources. A critical parameter for the implementation of standard high-efficiency photovoltaic absorber materials for photoelectrochemical water splitting is its proper protection from chemical corrosion while remaining transparent and highly conductive. One of the best candidates is titanium dioxide, as it is known to be stable in wide range of pH and has shown effective protection both for HER and OER applications. We analyze the influence of ALD growth temperature on the charge transfer across protective TiO2 coatings for silicon and chalcogenide photocathodes and photoanodes, and the conduction path across these TiO2 layers were determined by conductivity AFM.
Because of the sluggish kinetics associated to the water oxidation reaction and of inherent limitations in the H2 economy, the possibility of storing energy to other kind of redox pairs has recently attracted more attention, giving rise to the so-called solar-powered electrochemical energy storage (SPEES). The ability of protected crystalline silicon to photoassist the V3+/V2+ cathodic reaction under simulated solar irradiation, combined with the effect of bismuth have led to important electrochemical improvements. High reversibility of the V3+/V2+ redox pair, and improvement in the electrokinetics were attained thanks to the addition of bismuth. In fact, Bi0 deposition has shown to slightly decrease the photocurrent, but the significant enhancement in the charge transfer, reflected in the overall electrochemical performance clearly justifies its use as additive in a photoassisted system for maximizing the efficiency of solar charge to battery.
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