We report that by engineering the intra-gap defect related energy states in GaN nanowire arrays using Mg dopants, efficient and stable overall neutral water splitting can be achieved under violet light. Overall neutral water splitting on Rh/Cr2O3 co-catalyst decorated Mg doped GaN nanowires is demonstrated with intra-gap excitation up to 450 nm. Through optimized Mg doping, the absorbed photon conversion efficiency of GaN nanowires reaches ∼43% at 375–450 nm, providing a viable approach to extend the solar absorption of oxide and non-oxide photocatalysts.
Defect-engineered GaN:Mg nanowire arrays for overall water splitting under violet light
M. G. Kibria, F. A. Chowdhury, S. Zhao, M. L. Trudeau, H. Guo, Z. Mi; Defect-engineered GaN:Mg nanowire arrays for overall water splitting under violet light. Appl. Phys. Lett. 16 March 2015; 106 (11): 113105. https://doi.org/10.1063/1.4915609
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