Doping site dependent thermoelectric properties of epitaxial strontium titanate thin films

Anas I. Abutaha; S. R. Sarath Kumar; Arash Mehdizadeh Dehkordi; TERRY M. TRITT; Husam N. Alshareef

doi:10.1039/c4tc01723d

Doping site dependent thermoelectric properties of epitaxial strontium titanate thin films

Anas I. Abutaha, S. R. Sarath Kumar, Arash Mehdizadeh Dehkordi, TERRY M. TRITT, Husam N. Alshareef

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

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

Original language	English (US)
Pages (from-to)	9712-9719
Number of pages	8
Journal	J. Mater. Chem. C
Volume	2
Issue number	45
DOIs	https://doi.org/10.1039/c4tc01723d
State	Published - Oct 17 2014

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: The authors acknowledge the financial support of the competitive Faculty Initiated Collaboration Grant from KAUST.

ASJC Scopus subject areas

General Chemistry
Materials Chemistry

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10.1039/c4tc01723d

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title = "Doping site dependent thermoelectric properties of epitaxial strontium titanate thin films",

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",

author = "Abutaha, {Anas I.} and {Sarath Kumar}, {S. R.} and {Mehdizadeh Dehkordi}, Arash and TRITT, {TERRY M.} and Alshareef, {Husam N.}",

note = "KAUST Repository Item: Exported on 2020-10-01 Acknowledgements: The authors acknowledge the financial support of the competitive Faculty Initiated Collaboration Grant from KAUST.",

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doi = "10.1039/c4tc01723d",

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AU - Abutaha, Anas I.

AU - Sarath Kumar, S. R.

AU - Mehdizadeh Dehkordi, Arash

AU - TRITT, TERRY M.

AU - Alshareef, Husam N.

N1 - KAUST Repository Item: Exported on 2020-10-01 Acknowledgements: The authors acknowledge the financial support of the competitive Faculty Initiated Collaboration Grant from KAUST.

PY - 2014/10/17

Y1 - 2014/10/17

N2 - 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

AB - 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

UR - http://hdl.handle.net/10754/563253

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JF - J. Mater. Chem. C

IS - 45

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Doping site dependent thermoelectric properties of epitaxial strontium titanate thin films

Abstract

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