Tuning thermal conductivity in homoepitaxial SrTiO3 films via defects

Charles M. Brooks; Richard B. Wilson; Anna Schäfer; Julia A. Mundy; Megan E. Holtz; David A. Muller; Jürgen Schubert; David G. Cahill; Darrell G. Schlom

doi:10.1063/1.4927200

Tuning thermal conductivity in homoepitaxial SrTiO₃ films via defects

Charles M. Brooks, Richard B. Wilson, Anna Schäfer, Julia A. Mundy, Megan E. Holtz, David A. Muller, Jürgen Schubert, David G. Cahill, Darrell G. Schlom

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

Abstract

We demonstrate the ability to tune the thermal conductivity of homoepitaxial SrTiO₃ films deposited by reactive molecular-beam epitaxy by varying growth temperature, oxidation environment, and cation stoichiometry. Both point defects and planar defects decrease the longitudinal thermal conductivity (k₃₃), with the greatest decrease in films of the same composition observed for films containing planar defects oriented perpendicular to the direction of heat flow. The longitudinal thermal conductivity can be modified by as much as 80% - from 11.5W m^-1K^-1 for stoichiometric homoepitaxial SrTiO₃ to 2W m^-1K^-1 for strontium-rich homoepitaxial Sr₁₊_δTiO_x films - by incorporating (SrO)₂ Ruddlesden-Popper planar defects.

Original language	English (US)
Article number	051902
Journal	Applied Physics Letters
Volume	107
Issue number	5
DOIs	https://doi.org/10.1063/1.4927200
State	Published - Aug 3 2015

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

Online availability

10.1063/1.4927200

Library availability

Discover UIUC Full Text

Cite this

@article{88f0b332f57847409b42c16f8390e6a3,

title = "Tuning thermal conductivity in homoepitaxial SrTiO3 films via defects",

abstract = "We demonstrate the ability to tune the thermal conductivity of homoepitaxial SrTiO3 films deposited by reactive molecular-beam epitaxy by varying growth temperature, oxidation environment, and cation stoichiometry. Both point defects and planar defects decrease the longitudinal thermal conductivity (k33), with the greatest decrease in films of the same composition observed for films containing planar defects oriented perpendicular to the direction of heat flow. The longitudinal thermal conductivity can be modified by as much as 80% - from 11.5W m-1K-1 for stoichiometric homoepitaxial SrTiO3 to 2W m-1K-1 for strontium-rich homoepitaxial Sr1+δTiOx films - by incorporating (SrO)2 Ruddlesden-Popper planar defects.",

author = "Brooks, {Charles M.} and Wilson, {Richard B.} and Anna Sch{\"a}fer and Mundy, {Julia A.} and Holtz, {Megan E.} and Muller, {David A.} and J{\"u}rgen Schubert and Cahill, {David G.} and Schlom, {Darrell G.}",

note = "Publisher Copyright: {\textcopyright} 2015 AIP Publishing LLC.",

year = "2015",

month = aug,

day = "3",

doi = "10.1063/1.4927200",

language = "English (US)",

volume = "107",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics Publising LLC",

number = "5",

}

TY - JOUR

T1 - Tuning thermal conductivity in homoepitaxial SrTiO3 films via defects

AU - Brooks, Charles M.

AU - Wilson, Richard B.

AU - Schäfer, Anna

AU - Mundy, Julia A.

AU - Holtz, Megan E.

AU - Muller, David A.

AU - Schubert, Jürgen

AU - Cahill, David G.

AU - Schlom, Darrell G.

PY - 2015/8/3

Y1 - 2015/8/3

N2 - We demonstrate the ability to tune the thermal conductivity of homoepitaxial SrTiO3 films deposited by reactive molecular-beam epitaxy by varying growth temperature, oxidation environment, and cation stoichiometry. Both point defects and planar defects decrease the longitudinal thermal conductivity (k33), with the greatest decrease in films of the same composition observed for films containing planar defects oriented perpendicular to the direction of heat flow. The longitudinal thermal conductivity can be modified by as much as 80% - from 11.5W m-1K-1 for stoichiometric homoepitaxial SrTiO3 to 2W m-1K-1 for strontium-rich homoepitaxial Sr1+δTiOx films - by incorporating (SrO)2 Ruddlesden-Popper planar defects.

AB - We demonstrate the ability to tune the thermal conductivity of homoepitaxial SrTiO3 films deposited by reactive molecular-beam epitaxy by varying growth temperature, oxidation environment, and cation stoichiometry. Both point defects and planar defects decrease the longitudinal thermal conductivity (k33), with the greatest decrease in films of the same composition observed for films containing planar defects oriented perpendicular to the direction of heat flow. The longitudinal thermal conductivity can be modified by as much as 80% - from 11.5W m-1K-1 for stoichiometric homoepitaxial SrTiO3 to 2W m-1K-1 for strontium-rich homoepitaxial Sr1+δTiOx films - by incorporating (SrO)2 Ruddlesden-Popper planar defects.

UR - http://www.scopus.com/inward/record.url?scp=84938772425&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84938772425&partnerID=8YFLogxK

U2 - 10.1063/1.4927200

DO - 10.1063/1.4927200

M3 - Article

AN - SCOPUS:84938772425

SN - 0003-6951

VL - 107

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 5

M1 - 051902

ER -