Large Seebeck coefficients and thermoelectric power factor of La-doped SrTiO3 thin films

Jalan, Bharat; Stemmer, Susanne
July 2010
Applied Physics Letters;7/26/2010, Vol. 97 Issue 4, p042106
Academic Journal
Seebeck coefficients and conductivity of La-doped SrTiO3 thin films grown by molecular beam epitaxy were measured as a function of carrier concentration. At low carrier concentrations, thin films show very high Seebeck coefficients (up to 980 μV K-1). The maximum thermoelectric power factor was 39 μWcm-1 K-2 at a carrier concentration of 7×1020 cm-3. La-delta-doped superlattices were also characterized and exhibited Seebeck coefficients of ∼500 μV K-1. The results are discussed in the context of reports of enhanced Seebeck coefficients in delta-doped SrTiO3 superlattices.


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