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Ultrafast-laser Modification of Thermoelectric Sb2Te3 Thin Films

  • Yuwei Li (a1) (a2), Vladimir A. Stoica (a1) (a2), Lynn Endicott (a1), Guoyu Wang (a1) (a2), Huarui Sun (a2) (a3), Kevin P. Pipe (a2) (a3), Ctirad Uher (a1) (a2) (a4) and Roy Clarke (a1) (a2) (a4)...

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.

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