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

Sunkara, Swathi; Vendra, Venkat Kalyan; Jasinski, Jacek Bogdan; Deutsch, Todd; Andriotis, Antonis N; Rajan, Krishna; Menon, Madhu; Sunkara, Mahendra · Adv Mater · 2014

basic_science · Level V

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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.