Half-metallic perovskite superlattices with colossal thermoelectric figure of merit

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Kahaly M. U., Ozdogan K., Schwingenschloegl U.

JOURNAL OF MATERIALS CHEMISTRY A, cilt.1, sa.29, ss.8406-8410, 2013 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 1 Sayı: 29
  • Basım Tarihi: 2013
  • Doi Numarası: 10.1039/c3ta11346a
  • Dergi Adı: JOURNAL OF MATERIALS CHEMISTRY A
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.8406-8410
  • Yıldız Teknik Üniversitesi Adresli: Evet

Özet

Nowadays heavy experimental efforts are focussed on doped oxide thermoelectrics to increase the thermopower and thermoelectric performance. We propose a high thermoelectric figure of merit for half-metallic SrTi1-xCoxO3 (x = 0, 0.125, 0.25, 0.375, and 0.5) in a superlattice with SrTiO3, which is stable at high temperatures and in an oxygen environment. The maximal value of Z hardly depends on the doping, while the temperature at which the maximum occurs increases with the Co concentration. The easy tunability from being an insulator to a half-metal under substitutional doping combined with the colossal figure of merit opens up great potential in the emerging field of spin-caloritronics.