Ultrafast-laser Modification of Thermoelectric Sb2Te3 Thin Films

作     者：Li, Yuwei Stoica, Vladimir A. Endicott, Lynn Wang, Guoyu Sun, Huarui Pipe, Kevin P. Uher, Ctirad Clarke, Roy 

作者机构：Department of Physics University of Michigan Ann Arbor USA Center for Solar and Thermal Energy Conversion University of Michigan Ann Arbor USA Department of Mechanical Engineering University of Michigan Ann Arbor USA Applied Physics Program University of Michigan Ann Arbor USA 

出 版 物：《MRS Online Proceedings Library》 

年 卷 期：2012年第1456卷第1期

页      面：1-6页

主　　题：laser nanostructure thermoelectric 

摘      要：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.