Enhanced thermoelectric performance of P-type BixSb2−xTe3 nanowires with pulsed laser assisted electrochemical deposition

Shengyu Jin, Amirkoushyar Ziabari, Yee Rui Koh, Mojib Saei, Xiaoming Wang, Biwei Deng, Yaowu Hu, Je Hyeong Bahk, Ali Shakouri, Gary J. Cheng

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Crystalline thermoelectric nanowires with well controlled chemical composition, defects and grain structures are desired for their thermoelectric performance. Here, P-type thermoelectric (TE) nanowires, BixSb2−xTe3, are deposited in anodized aluminum oxide (AAO) templates at room temperature by pulsed laser assisted electrochemical deposition (ECD). Evident differences in the ECD processes resulting from pulse laser irradiation are monitored by cyclic voltammetry (CV) and current–time (I-t) curves, where instant current developments are captured. Variations in the crystal structure due to laser assisted ECD are examined using high-resolution transmission electron microscope (HR-TEM). We find that after laser assisted ECD, nanowires are deposited in the highly oriented crystallographic direction with enhanced crystallinity. Simultaneous enhancements in the electrical conductivity and the Seebeck coefficient are observed for those nanowires treated by laser assisted ECD, while the thermal conductivity remains almost the same. Theoretical calculations based on the Boltzmann transport equations suggest that the reduction of charge carrier concentration by the reduced anti-site defect densities after the laser treatment is responsible for the large enhancement of the Seebeck coefficient for the nanowires. The reduced defect densities also increase the carrier mobility substantially, which results in the enhanced electrical conductivity despite the reduced carrier concentration. This work highlights the beneficial impacts of the laser treatment for the thermoelectric performances of electrochemically grown semiconductor nanowires.

Original languageEnglish
Pages (from-to)386-396
Number of pages11
JournalExtreme Mechanics Letters
Volume9
DOIs
StatePublished - Dec 1 2016
Externally publishedYes

Funding

Authors want to thank financial support from Office of Naval research DURIP program, NSF CMMI division ( 1030786 , 1538360 ), and Indiana Next Generation Manufacturing Competitiveness Center .

Keywords

  • AAO template
  • Electrochemical deposition
  • Laser irradiation
  • Thermoelectric Nanowires

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