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Adv Mater. 2014 May;26(18):2878-82. doi: 10.1002/adma.201305083. Epub 2014 Feb 17.

New visible light absorbing materials for solar fuels, Ga(Sbx)N1-x.

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  • 1Department of Chemical Engineering and Conn Center for Renewable Energy Research, University of Louisville, Louisville, KY, USA.

Abstract

A novel visible-light-absorbing dilute alloy, Ga(Sbx)N1-x is synthesized by metal organic chemical vapor deposition (MOCVD) for solar hydrogen production. Significant bandgap reduction of GaN, from 3.4 eV to 1.8 eV, is observed, with a low (2%) incorporation of antimonide, and the lattice expansion is in agreement with our first-principles calculations. The band edges of Ga(Sbx)N1-x are found to straddle the water redox potentials showing excellent suitability for solar water splitting.

© 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

KEYWORDS:

GaN alloys; density functional theory (DFT); photoelectrochemical water splitting; solar fuels

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