Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 19, Issue 4, Pages 2760-2767Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6cp07111b
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Funding
- National Science Foundation [1254600]
- Center for Functional Nanomaterials, a U.S. DOE Office of Science Facility at the Brookhaven National Laboratory [DE-SC0012704]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1254600] Funding Source: National Science Foundation
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A very limited knowledge exists about the effect of non-uniform doping of epitaxially grown strontium titanate thin film electrodes on their photoelectrochemical performance in water splitting. In this work, water splitting photoanodes featuring an n(+)-n homojunction were fabricated by the pulsed laser deposition technique, where epitaxial SrTiO3 thin films were grown on Nb doped n(+)-SrTiO3 single crystalline substrates. Thermal diffusion of niobium from doped substrates into the deposited thin films formed an n(+)-n homojunction, which was profiled by angle-resolved XPS and cross-sectional STEM-EDX techniques. This homojunction was found to make a significant impact on the incident photon-to-current efficiency of photoanodes by affecting their depletion width, which was in agreement with the theoretical simulations.
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