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Proceedings Paper

Copper gallium diselenide photocathodes for solar photoelectrolysis
Author(s): Bjorn Marsen; Brian Cole; Susanne Dorn; Richard E. Rocheleau; Eric L. Miller
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Paper Abstract

Copper chalcopyrite films exhibit properties suitable for solar energy conversion processes such as direct bandgap, and excellent carrier transport. To explore the possibilities of solar-powered hydrogen production by photoelectrolysis using these materials, we have synthesized p-type polycrystalline CuGaSe2 films by vacuum co-evaporation of the elemental constituents, and performed physical and electrochemical characterizations of the resulting films and electrodes. Based on CuGaSe2 material with 1.65 eV bandgap, a 2.2 micron thick electrode exhibited an outdoor 1-sun photocurrent of 16 mA/cm2, while a 0.9 micron thin device still produced 12.6 mA/cm2 in conjunction with vigorous gas evolution. Flatband potential measurements and bias voltage requirements for saturation photocurrents indicate a valence band position to high for practical device implementation. Future photoelectrolysis devices may be based on copper chalcopyrites with lower valence band maximum in conjunction with a suitable auxiliary junction.

Paper Details

Date Published: 11 September 2007
PDF: 6 pages
Proc. SPIE 6650, Solar Hydrogen and Nanotechnology II, 665006 (11 September 2007); doi: 10.1117/12.732737
Show Author Affiliations
Bjorn Marsen, Univ. of Hawaii at Manoa (United States)
Brian Cole, Univ. of Hawaii at Manoa (United States)
Susanne Dorn, Univ. of Hawaii at Manoa (United States)
Richard E. Rocheleau, Univ. of Hawaii at Manoa (United States)
Eric L. Miller, Univ. of Hawaii at Manoa (United States)

Published in SPIE Proceedings Vol. 6650:
Solar Hydrogen and Nanotechnology II
Jinghua Guo, Editor(s)

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