Schematic description of the experimental process step by step for the Si nanostructures fabrication; XRD and ellipsometry data of the TiO₂ layer; chronoamperometry measurements of Si nanocones with and without TiO₂ layer; SEM image of Si nanocone after illumination without the TiO₂ layer; current-vs-potential measurement on silicon nanocones; SEM images in and out of the illumination spot and of the illumination spot itself; representation of the photo-electrochemical cell; schematic diagram of the FDTD simulations and SEM images of more silicon nanostructures after photo-electrodeposition of platinum for verification of the effect.

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