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Cha, Dong Kyu
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Publications (4/4 displayed)
- 2014Thermoelectric properties of strontium titanate superlattices incorporating niobium oxide nanolayerscitations
- 2013Fabrication and characterization of high-mobility solution-based chalcogenide thin-film transistorscitations
- 2013High-performance ferroelectric memory based on phase-separated films of polymer blendscitations
- 2011Lattice dynamics and substrate-dependent transport properties of (In, Yb)-doped CoSb3 skutterudite thin filmscitations
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article
Thermoelectric properties of strontium titanate superlattices incorporating niobium oxide nanolayers
Abstract
A novel superlattice structure based on epitaxial nanoscale layers of NbOx and Nb-doped SrTiO3 is fabricated using a layer-by-layer approach on lattice matched LAO substrates. The absolute Seebeck coefficient and electrical conductivity of the [(NbOx) a/(Nb-doped SrTiO3)b]20 superlattices (SLs) were found to increase with decreasing layer thickness ratio (a/b ratio), reaching, at high temperatures, a power factor that is comparable to epitaxial Nb-doped SrTiO3 (STNO) films (∼0.7 W m-1 K-1). High temperature studies reveal that the SLs behave as n-type semiconductors and undergo an irreversible change at a varying crossover temperature that depends on the a/b ratio. By use of high resolution X-ray photoelectron spectroscopy and X-ray diffraction, the irreversible changes are identified to be due to a phase transformation from cubic NbO to orthorhombic Nb2O5, which limits the highest temperature of stable operation of the superlattice to 950 K. © 2014 American Chemical Society.