Seebeck coefficient of a quantum confined, high-electron-density electron gas in SrTiO 3

We report on the Seebeck coefficient of quantum confined electron gases in GdTiO 3 /SrTiO 3 heterostructures. These structures contain two-dimensional electron gases with very high sheet-carrier concentrations on the SrTiO 3 -side of the interface due to intrinsic interface doping. While the sheet c...

Full description

Saved in:
Bibliographic Details
Published in:Applied physics letters 2012-04, Vol.100 (16), p.161601-161601-3
Main Authors: Cain, Tyler A., Lee, SungBin, Moetakef, Pouya, Balents, Leon, Stemmer, Susanne, James Allen, S.
Format: Article
Language:English
Subjects:
solar (photovoltaic), solid state lighting, phonons, thermoelectric, bio-inspired, energy storage (including batteries and capacitors), electrodes - solar, defects, charge transport, materials and chemistry by design, optics, synthesis (novel materials), synthesis (self-assembly), synthesis (scalable processing)
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We report on the Seebeck coefficient of quantum confined electron gases in GdTiO 3 /SrTiO 3 heterostructures. These structures contain two-dimensional electron gases with very high sheet-carrier concentrations on the SrTiO 3 -side of the interface due to intrinsic interface doping. While the sheet carrier concentrations are independent of the thickness of the SrTiO 3 layer, the Seebeck coefficient initially increases with SrTiO 3 thickness before saturating at a value of ∼300 μ K/V. A model of the Seebeck coefficient, based on thermally populated, self-consistent, tight binding subbands, captures in a semi-quantitative manner the observed thickness dependence.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4704363