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    Doping site dependent thermoelectric properties of epitaxial strontium titanate thin films

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    Type
    Article
    Authors
    Abutaha, Anas I. cc
    Sarath Kumar, S. R.
    Mehdizadeh Dehkordi, Arash
    TRITT, TERRY M.
    Alshareef, Husam N. cc
    KAUST Department
    Functional Nanomaterials and Devices Research Group
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2014-10-17
    Permanent link to this record
    http://hdl.handle.net/10754/563253
    
    Metadata
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    Abstract
    We demonstrate that the thermoelectric properties of epitaxial strontium titanate (STO) thin films can be improved by additional B-site doping of A-site doped ABO3 type perovskite STO. The additional B-site doping of A-site doped STO results in increased electrical conductivity, but at the expense of Seebeck coefficient. However, doping on both sites of the STO lattice significantly reduces the lattice thermal conductivity of STO by adding more densely and strategically distributed phononic scattering centers that attack wider phonon spectra. The additional B-site doping limits the trade-off relationship between the electrical conductivity and total thermal conductivity of A-site doped STO, leading to an improvement in the room-temperature thermoelectric figure of merit, ZT. The 5% Pr3+ and 20% Nb5+ double-doped STO film exhibits the best ZT of 0.016 at room temperature. This journal is
    Citation
    Abutaha, A. I., Sarath Kumar, S. R., Mehdizadeh Dehkordi, A., Tritt, T. M., & Alshareef, H. N. (2014). Doping site dependent thermoelectric properties of epitaxial strontium titanate thin films. J. Mater. Chem. C, 2(45), 9712–9719. doi:10.1039/c4tc01723d
    Sponsors
    The authors acknowledge the financial support of the competitive Faculty Initiated Collaboration Grant from KAUST.
    Publisher
    Royal Society of Chemistry (RSC)
    Journal
    J. Mater. Chem. C
    DOI
    10.1039/c4tc01723d
    ae974a485f413a2113503eed53cd6c53
    10.1039/c4tc01723d
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program

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