Major enhancement of the thermoelectric performance in Pr/Nb-doped SrTiO3 under strain | Zendy

B. Amin | Zendy; Nirpendra Singh | Zendy; Terry M. Tritt | Zendy; Husam N. Alshareef | Zendy; Udo Schwingenschlögl | Zendy

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Major enhancement of the thermoelectric performance in Pr/Nb-doped SrTiO3 under strain

Author(s) -

B. Amin,

Nirpendra Singh,

Terry M. Tritt,

Husam N. Alshareef,

Udo Schwingenschlögl

Publication year - 2013

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4815928

Subject(s) - thermoelectric effect , materials science , doping , seebeck coefficient , thermoelectric materials , atmospheric temperature range , figure of merit , condensed matter physics , strain (injury) , optoelectronics , nanotechnology , engineering physics , composite material , thermodynamics , thermal conductivity , physics , medicine , engineering

The 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

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