Thermoelectricity of double doped strontium titanate

Jayakanth Ravichandran, Wolter Siemons, Justin Kardel, Herman Heijmerikx, Arvind Chari, Dongwook Oh, David G Cahill, Ramamoorthy Ramesh, Arun Majumdar

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Lanthanum (La) doped Strontium Titanate (SrTiO3) is amongst the most promising n-type thermoelectric materials for power generation. We report a double doping method for thin films of SrTiO3 (STO), grown by Pulsed Laser Deposition (PLD), where doping of STO in the Sr-site by Lanthanum is accompanied by doping with oxygen vacancies. In the past theoretical predictions have shown that introducing oxygen vacancies in STO produces a high-effective mass defect band just below the conduction band edge, explaining the high seebeck coefficient observed in oxygen deficient STO. Based on careful transport measurements, we show that it is possible to obtain enhanced thermoelectric power factor by double doping, using La and oxygen vacancies in these thin films. With the aid of optical spectroscopic measurements, we establish the presence of the impurity band created by the vacancies and validate their role in the enhanced thermoelectric performance with structural and transport measurements. The presence of oxygen vacancies also serves to decrease the thermal conductivity due to effective phonon scattering.

Original languageEnglish (US)
Title of host publication2010 14th International Heat Transfer Conference, IHTC 14
Pages839-843
Number of pages5
DOIs
StatePublished - Dec 1 2010
Event2010 14th International Heat Transfer Conference, IHTC 14 - Washington, DC, United States
Duration: Aug 8 2010Aug 13 2010

Publication series

Name2010 14th International Heat Transfer Conference, IHTC 14
Volume4

Other

Other2010 14th International Heat Transfer Conference, IHTC 14
CountryUnited States
CityWashington, DC
Period8/8/108/13/10

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes

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  • Cite this

    Ravichandran, J., Siemons, W., Kardel, J., Heijmerikx, H., Chari, A., Oh, D., Cahill, D. G., Ramesh, R., & Majumdar, A. (2010). Thermoelectricity of double doped strontium titanate. In 2010 14th International Heat Transfer Conference, IHTC 14 (pp. 839-843). (2010 14th International Heat Transfer Conference, IHTC 14; Vol. 4). https://doi.org/10.1115/IHTC14-22352