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Enhanced Thermoelectric Performance of BST/WSe2 Heterostructures Through Defect-Driven Microstructural Modifications.

Karan Giri1, Yen-Ling Wang1, Yi-Ting Wu1

  • 1Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Ta-Hsueh Rd. 1001, Hsin-Chu, 30010, Taiwan R.O.C.

Small Methods
|October 7, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed novel BST/WSe2 heterostructures for enhanced thermoelectric performance. Defect engineering and WSe2

Keywords:
BST/WSe2 heterostructureenergy filteringmultiscale defectspulsed laser depositionthermoelectric

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Thermoelectric materials convert heat to electricity, crucial for waste heat recovery.
  • Barium Strontium Titanate (BST) shows promise, but its thermoelectric efficiency needs improvement.
  • Tungsten Diselenide (WSe2) is a 2D material with tunable electronic properties.

Purpose of the Study:

  • To fabricate BST/WSe2 heterostructured films using dual-beam pulsed laser deposition.
  • To investigate the impact of WSe2 incorporation on thermoelectric properties of BST.
  • To optimize film deposition for superior thermoelectric performance.

Main Methods:

  • Dual-beam pulsed laser deposition for BST/WSe2 heterostructure fabrication.
  • Structural characterization to identify induced imperfections (e.g., dislocations, W atoms).
  • Thermoelectric property measurements (Seebeck coefficient, electrical conductivity, thermal conductivity).

Main Results:

  • Periodic WSe2 incorporation created structural imperfections, enhancing phonon scattering.
  • WSe2's ambipolar nature allowed tuning of carrier concentration and energy filtering.
  • Optimal deposition at 623 K yielded a power factor of ≈60.72 µW cm⁻² K⁻² at 447 K, surpassing previous reports.
  • Moderate defect scattering at 623 K balanced mobility losses and thermal excitation.

Conclusions:

  • Defect and interface engineering in BST/WSe2 heterostructures significantly enhances thermoelectric performance.
  • The ambipolar semiconductor WSe2 is a key component for tuning thermoelectric properties.
  • These findings pave the way for designing scalable, high-performance thermoelectric materials.