title: Photoelectrochemical water splitting with a SrTiO3:Nb/SrTiO3n+-n homojunction structure.
abstract: 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 SrTiO3thin films were grown on Nb doped n+-SrTiO3single 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.
authors.affiliation: Department of Materials and Science Engineering, Stony Brook University, Stony Brook, New York 11794, USA. alexander.orlov@stonybrook.edu.
authors.forename: Jiajie
authors.identifier: http://orcid.org/0000-0002-0344-9298
authors.initials: J
authors.lastname: Cen
authors.affiliation: Department of Materials and Science Engineering, Stony Brook University, Stony Brook, New York 11794, USA. alexander.orlov@stonybrook.edu.
authors.forename: Qiyuan
authors.initials: Q
authors.lastname: Wu
authors.affiliation: Department of Materials and Science Engineering, Stony Brook University, Stony Brook, New York 11794, USA. alexander.orlov@stonybrook.edu and Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, USA. mzliu@bnl.gov.
authors.forename: Danhua
authors.identifier: http://orcid.org/0000-0003-4112-3018
authors.initials: D
authors.lastname: Yan
authors.affiliation: Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA.
authors.forename: Jing
authors.initials: J
authors.lastname: Tao
authors.affiliation: Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, USA. mzliu@bnl.gov.
authors.forename: Kim
authors.initials: K
authors.lastname: Kisslinger
authors.affiliation: Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, USA. mzliu@bnl.gov.
authors.forename: Mingzhao
authors.identifier: http://orcid.org/0000-0002-0999-5214
authors.initials: M
authors.lastname: Liu
authors.affiliation: Department of Materials and Science Engineering, Stony Brook University, Stony Brook, New York 11794, USA. alexander.orlov@stonybrook.edu.
authors.forename: Alexander
authors.initials: A
authors.lastname: Orlov