Abstract
The fabrication and photoelectrochemical characterization of a ZnO/ZnO:Cr isostructural nanojunction electrode is presented. When compared to its constituent components the isostructural nanojunction showed superior performance for water splitting under simulated solar light and visible light (λ>510nm) illumination. In the engineered structure, the presence of intra-bandgap states associated with Cr impurities increases optical absorption, and the nanorod morphology provides a direct pathway for transport of photo-excited electrons to the back contact. The overall photoelectrochemical performance of the ZnO/ZnO:Cr engineered structure is relatively low, however the concept may prove to be applicable to more optimized structures or material systems.
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