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Ultrafast-laser Modification of Thermoelectric Sb2Te3 Thin Films

Published online by Cambridge University Press:  02 August 2012

Yuwei Li ,
Vladimir A. Stoica ,
Lynn Endicott ,
Guoyu Wang ,
Huarui Sun ,
Kevin P. Pipe ,
Ctirad Uher  and
Roy Clarke
Yuwei Li
Affiliation:
Department of Physics, University of Michigan, Ann Arbor, MI 48109 Center for Solar and Thermal Energy Conversion, University of Michigan, Ann Arbor, MI 48109
Vladimir A. Stoica
Affiliation:
Department of Physics, University of Michigan, Ann Arbor, MI 48109 Center for Solar and Thermal Energy Conversion, University of Michigan, Ann Arbor, MI 48109
Lynn Endicott
Affiliation:
Department of Physics, University of Michigan, Ann Arbor, MI 48109
Guoyu Wang
Affiliation:
Department of Physics, University of Michigan, Ann Arbor, MI 48109 Center for Solar and Thermal Energy Conversion, University of Michigan, Ann Arbor, MI 48109
Huarui Sun
Affiliation:
Center for Solar and Thermal Energy Conversion, University of Michigan, Ann Arbor, MI 48109 Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109
Kevin P. Pipe
Affiliation:
Center for Solar and Thermal Energy Conversion, University of Michigan, Ann Arbor, MI 48109 Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109
Ctirad Uher
Affiliation:
Department of Physics, University of Michigan, Ann Arbor, MI 48109 Center for Solar and Thermal Energy Conversion, University of Michigan, Ann Arbor, MI 48109 Applied Physics Program, University of Michigan, Ann Arbor, MI 48109
Roy Clarke
Affiliation:
Department of Physics, University of Michigan, Ann Arbor, MI 48109 Center for Solar and Thermal Energy Conversion, University of Michigan, Ann Arbor, MI 48109 Applied Physics Program, University of Michigan, Ann Arbor, MI 48109
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Abstract

We have modified Sb2Te3 thin film thermoelectric materials by scanning a femtosecond laser across the film surface to create track-like nanostructures. These nanotracks have widths of 50-80 nm and a periodicity of ∼ 130 nm. We show that the nanotrack morphology is highly dependent on laser fluence and scan speed. Moreover, we performed transient thermoreflectance measurements on a laser-irradiated film and found a thermal conductivity reduction of 4.5% in the nanostructured regions compared to that of the unmodified regions. These results suggest the potential use of femtosecond pulsed lasers to create nanostructured thermoelectric materials with improved performance.

Keywords

lasernanostructurethermoelectric
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1456: Symposium JJ – Nanoscale Thermoelectrics 2012—Materials and Transport Phenomena , 2012 , mrss12-1456-jj04-10
Copyright
Copyright © Materials Research Society 2012

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References

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