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Laser Shock Dislocation Proliferation Drives Enhanced Thermoelectric Performance in Ag2Se.

Quanxing Zhai1, Bo Zhu1, Wenqi Gong1

  • 1School of Integrated Circuits, The Institute of Technological Sciences, Wuhan University, Bayi Road 299, Wuhan 430072, China.

Nano Letters
|December 12, 2025
PubMed
Summary

Laser shock dislocation proliferation (LSDP) creates dense dislocations in Ag2Se, significantly boosting thermoelectric performance. This novel method enhances the figure of merit (zT) by 40% compared to traditional techniques.

Keywords:
Ag2Sedense dislocationenhanced thermoelectric performancenanosecond laser shockultralow thermal conductivity

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Dense dislocations are crucial for reducing thermal conductivity and enhancing the thermoelectric figure of merit (zT).
  • Conventional methods for introducing dislocations often lack universality due to doping and complex synthetic processing.

Purpose of the Study:

  • To investigate the effectiveness of laser shock dislocation proliferation (LSDP) for creating high densities of dislocations in Ag2Se.
  • To evaluate the impact of LSDP-induced dislocations on the thermoelectric properties of Ag2Se.

Main Methods:

  • Utilized laser shock dislocation proliferation (LSDP) to introduce dislocations into Ag2Se, achieving densities of ~10^13/cm^2.
  • Characterized the material properties under high pressure (peak > 4.5 GPa), specific pressure duration (198 ns), impact depth (> 0.5 mm), and strain rate (1.52 × 10^7 s^-1).

Main Results:

  • LSDP introduced dislocation densities 2-3 orders of magnitude higher than spark plasma sintering (SPS).
  • Reduced total thermal conductivity by 23.2% and lattice thermal conductivity by 17.1%.
  • Achieved a thermoelectric figure of merit (zT) of 0.91, a 40% improvement over SPS samples.

Conclusions:

  • Laser shock dislocation proliferation is a highly effective technique for generating dense dislocations in brittle thermoelectric materials like Ag2Se.
  • LSDP offers a promising, universal strategy for enhancing thermoelectric performance by optimizing thermal transport properties.