Thermal stability of giant thermoelectric: Seebeck coefficient for SrTiO3SrTi0.8Nb0.2O3 Superlattices at 900 K

Kyu Hyoung Lee, Yoriko Mune, Hiromichi Ohta, Kunihito Koumoto

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32 Citations (Scopus)

Abstract

Herein we report the carrier transport properties of [(SrTiO 3)x/(SrTi0.8Nb0.2O3) 1]20 (× = 0-50) superlattices at high temperatures (T = 300-900 K). Significant structural changes were not observed in the superlattices after annealing at 900 K in a vacuum. The Seebeck coefficient of the [(SrTiO3)20/SrTi0.8Nb0.2O 3)1]20 superlattice, which was 300μV.K -1 at room temperature, gradually increased with temperature and reached 450μV-K-1 at 900 K, which is ~3 times larger than that of bulk SrTi0.8Nb0.2O3. These observations provide clear evidence that the superlattice is stable and exhibits a giant Seebeck coefficient even at high temperature.

Original languageEnglish
Article number015007
JournalApplied Physics Express
Volume1
Issue number1
DOIs
Publication statusPublished - 2008 Jan

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

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