Major enhancement of the thermoelectric performance in Pr/Nb-doped SrTiO3 under strain
KAUST DepartmentPhysical Sciences and Engineering (PSE) Division
Functional Nanomaterials and Devices Research Group
Materials Science and Engineering Program
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AbstractThe electronic structure and thermoelectric properties of strained (biaxially and uniaxially) Sr0.95Pr0.05TiO3 and SrTi0.95Nb0.05O3 are investigated in the temperature range from 300 K to 1200 K. Substitutions of Pr at the Sr site and Nb at the Ti site generate n-type doping and thus improve the thermoelectric performance as compared to pristine SrTiO3. Further enhancement is achieved by the application of strain, for example, of the Seebeck coefficient by 21% for Sr0.95Pr0.05TiO3 and 10% for SrTi0.95Nb0.05O3 at room temperature in the case of 5% biaxial strain. At 1200 K, we predict figures of merit of 0.58 and 0.55 for 2.5% biaxially strained Sr0.95Pr0.05TiO3 and SrTi0.95Nb0.05O3 , respectively, which are the highest values reported for rare earth doped SrTiO3.
CitationAmin B, Singh N, Tritt TM, Alshareef HN, Schwingenschlögl U (2013) Major enhancement of the thermoelectric performance in Pr/Nb-doped SrTiO3 under strain. Appl Phys Lett 103: 031907. doi:10.1063/1.4815928.
JournalApplied Physics Letters