Photogalvanic cell having transparent photoactive TIO.sub.2 thin

Details Photogalvanic cell having transparent photoactive TIO.sub.2 thin Photogalvanic cell having transparent photoactive TIO.sub.2 thin

1977-01-27

1978-09-26

Weisstuch, Aaron

Chemistry: electrical current producing apparatus, product, and

Deferred action type

Responsive to light

H01M 630, H01M 636

Patent

active

041172108

ABSTRACT:
A photogalvanic cell includes a conducting SnO.sub.2 electrode upon which is deposited a semi-transparent film of Ti. A metal oxide thin film, such as TiO.sub.2 is in turn deposited upon the semi-transparent Ti thin film. An aqueous (acid or base) electrolyte contacts the metal oxide thin film to form a photoactive site for converting light to electrical energy. The semi-transparent film reduces the internal resistance of the cell by assisting charge transfer between the metal oxide film and the electrode. Also, use of a semi-transparent film permits bi-directional irradiation of the cell to increase photoconversion efficiency.

REFERENCES:
patent: 4011149 (1977-03-01), Nozik
patent: 4042758 (1977-08-01), Weinstein et al.
M. S. Wrighton et al., "Photoassisted Electrolysis of Water by Irradiation of a Titanium Dioxide Electrode, " Proc. Nat. Acad. Sci. U.S.A., vol. 72, pp. 1518-1522, (1975).
K. Hardee et al., "Semiconductor Electrodes, Part I," J. Electrochem. Soc., vol. 122, pp. 739-742, (1975).

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