Dye-sensitized Schottky barrier solar cells

Details Dye-sensitized Schottky barrier solar cells Dye-sensitized Schottky barrier solar cells

1977-06-01

1978-08-08

Weisstuch, Aaron

Batteries: thermoelectric and photoelectric

Thermoelectric

Radiation pyrometer

136 89NB, 357 8, 357 15, 357 30, H01L 3106

Patent

active

041054709

ABSTRACT:
A low-cost dye-sensitized Schottky barrier solar cell comprised of a substrate of semiconductor with an ohmic contact on one face, a sensitizing dye adsorbed onto the opposite face of the semiconductor, a transparent thin-film layer of a reducing agent over the dye, and a thin-film layer of metal over the reducing agent. The ohmic contact and metal layer constitute electrodes for connection to an external circuit and one or the other or both are made transparent to permit light to penetrate to the dye and be absorbed therein for generating electric current. The semiconductor material chosen to be the substrate is one having a wide bandgap and which therefore is transparent; the dye selected is one having a ground state within the bandgap of the semiconductor to generate carriers in the semiconductor, and a first excited state above the conduction band edge of the semiconductor to readily conduct electrons from the dye to the semiconductor; the reducing agent selected is one having a ground state above the ground state of the sensitizer to provide a plentiful source of electrons to the dye during current generation and thereby enhance the generation; and the metal for the thin-film layer of metal is selected to have a Fermi level in the vicinity of or above the ground state of the reducing agent to thereby amply supply electrons to the reducing agent.

REFERENCES:
patent: 3935031 (1976-01-01), Adler
C. W. Tang et al., "Photovoltaic Effects of Metal-Chlorophyll-a-Metal Sandwich Cells", J. Chem. Phys., vol. 62, pp. 2139-2149 (1975).
R. Memming, "Photochemical & Electrochemical Processes of Excited Dyes at Semiconductor & Metal Electrodes", Photochem. Photobiol., vol. 16, pp. 325-333 (1972).
S. J. Dudkowski, "Sensitization of Photoconduction in a Zinc Oxide Film by Eosin", J. Opt. Sci. Am., vol. 54, pp. 486-491 (1964).
H. Meier et al., "Zum Problem Der pn-Ubergange Zwischen Organischen und Anorganischen Photoleitern", Ber. Bunsen Physik Chem., vol. 69, pp. 160-167 (1965).

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