High temperature thermoelectric properties of strontium titanate thin films with oxygen vacancy and niobium doping
KAUST DepartmentMaterials Science and Engineering Program
Physical Sciences and Engineering (PSE) Division
Functional Nanomaterials and Devices Research Group
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AbstractWe report the evolution of high temperature thermoelectric properties of SrTiO3 thin films doped with Nb and oxygen vacancies. Structure-property relations in this important thermoelectric oxide are elucidated and the variation of transport properties with dopant concentrations is discussed. Oxygen vacancies are incorporated during growth or annealing in Ar/H2 above 800 K. An increase in lattice constant due to the inclusion of Nb and oxygen vacancies is found to result in an increase in carrier density and electrical conductivity with simultaneous decrease in carrier effective mass and Seebeck coefficient. The lattice thermal conductivity at 300 K is found to be 2.22 W m-1 K-1, and the estimated figure of merit is 0.29 at 1000 K. © 2013 American Chemical Society.
SponsorsThis work was supported by the FIC grant of KAUST, for oxide thermoelectrics. Authors also thank Dr. Alexandre Jacquot, Fraunhofer IPM, Germany for the thermal conductivity measurements.
PublisherAmerican Chemical Society (ACS)
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