Visible-light-inducible voltage current property of hydrogel on laminated hydrogenated amorphous silicon film

To investigate the possibility of photoinduced controllability of an electrochemical element, using agarose gel, amino acids, and a hydrogenated amorphous silicon (a-Si:H) thin film, an electrochemical element, which constituted the fluorine doped tin oxide glass (FTO/glass) transparent conductive positive electrode, 2 mm thick 0.05 M-Asp gel, 2 mm thick 0.05 M-Arg gel, a-Si:H film ( hydrogen 0-40%, thickness 16.2 nm), a-Si:H film ( hydrogen 20%, thickness 81 nm), and FTO/glass transparent conductive negative electrode, was constructed. The visible-light-induced current vs a potential behavior was measured by potential step method. Compared with the case of hydrogen concentration of (layer 1, layer 2) = (20%, 20%), in the case of (20%, 40%) current vs potential increased. On the other hand, in the case of (20%, 0%), current became smaller than that in the (20%, 20%). From these results, a new application aspect of a-Si:H for the control of ion conductivity in organic molecules was revealed. (C) 2018 The Japan Society of Applied Physics