Thermal conductivity of Bi2(SexTe1−x)3 alloy films grown by molecular beam epitaxy

Taehee Yoo; Eungkyu Lee; Sining Dong; Xiang Li; Xinyu Liu; Jacek K. Furdyna; Margaret Dobrowolska; Tengfei Luo

doi:10.1063/1.4984974

APL Materials (Jun 2017)

Thermal conductivity of Bi2(SexTe1−x)3 alloy films grown by molecular beam epitaxy

Taehee Yoo,
Eungkyu Lee,
Sining Dong,
Xiang Li,
Xinyu Liu,
Jacek K. Furdyna,
Margaret Dobrowolska,
Tengfei Luo

Affiliations

Taehee Yoo: Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, Indiana 46556, USA
Eungkyu Lee: Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, Indiana 46556, USA
Sining Dong: Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
Xiang Li: Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
Xinyu Liu: Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
Jacek K. Furdyna: Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
Margaret Dobrowolska: Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
Tengfei Luo: Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, Indiana 46556, USA

DOI: https://doi.org/10.1063/1.4984974
Journal volume & issue: Vol. 5, no. 6
pp. 066101 – 066101-7

Abstract

Read online

We studied the thermal conductivity of Bi2Se3, Bi2Te3, and their alloy Bi2(SexTe1−x)3 at room temperature using time-domain thermoreflectance measurements. The Bi2(SexTe1−x)3 films with various concentrations of Se and Te prepared by molecular beam epitaxy on GaAs substrates were investigated to study the dependence of thermal conductivity on film composition. We observed that the Bi2(SexTe1−x)3 ternary alloys can have much lower thermal conductivity values compared to those of Bi2Se3 and Bi2Te3. These results may provide useful information for developing and engineering low thermal conductivity materials for thermoelectric applications.

Published in APL Materials

ISSN: 2166-532X (Online)
Publisher: AIP Publishing LLC
Country of publisher: United States
LCC subjects: Technology: Chemical technology: Biotechnology; Science: Physics
Website: http://aplmaterials.aip.org

About the journal