Anomalously large measured thermoelectric power factor in Sr${}_{1-x}$La${}_x$TiO${}_3$ thin films due to SrTiO${}_3$ substrate reduction

Abstract

We report the observation that thermoelectric thin-films of La-doped SrTiO3 grown on SrTiO3 substrates yield anomalously high values of thermopower to give extraordinary values of power factor at 300K. Thin-films of Sr0.98La0.02TiO3, grown via pulsed laser deposition at low temperature and low pressure (450C, 10-7Torr), do not yield similarly high values when grown on other substrates. The thin-film growth induces oxygen reduction in the SrTiO3 crystals, doping the substrate n-type. It is found that the backside resistance of the SrTiO3 substrates is as low (~12ohm/square) as it is on the film-side after film growth.

arXiv comment12 pages, 3 figures, pdf format

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• Full oxide heterostructure combining a high-Tc diluted ferromagnet with a high-mobility conductor
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• Polaron transport and thermoelectric behavior in La-doped SrTiO3 thin films with elemental vacancies
• Thermopower enhancement by fractional layer control in 2D oxide superlattices
• Thermoelectric La-doped SrTiO3 epitaxial layers with single-crystal quality: from nanometer to micrometer and mosaicity effects
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