Photoelectrochemical water splitting with a SrTiO 3 :Nb/SrTiO 3 n + -n homojunction structure

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 las...

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Published in:Physical chemistry chemical physics : PCCP 2017-01, Vol.19 (4), p.2760-2767
Main Authors: Cen, Jiajie, Wu, Qiyuan, Yan, Danhua, Tao, Jing, Kisslinger, Kim, Liu, Mingzhao, Orlov, Alexander
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cited_by cdi_FETCH-LOGICAL-c990-4a43c61b1aad2ea9c4915f5f0cd6f89cae38a76318a421b8124150ee10e809b13
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creator Cen, Jiajie
Wu, Qiyuan
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Liu, Mingzhao
Orlov, Alexander
description 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 SrTiO thin films were grown on Nb doped n -SrTiO 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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title Photoelectrochemical water splitting with a SrTiO 3 :Nb/SrTiO 3 n + -n homojunction structure
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