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Nanotwin-Engineered (Sb,Bi)2Si2Te6 for Robust and High-Efficiency Layered Thermoelectrics
Chen Chen1,2, Penghui Li1,3, Chen Chen4
1Center For High Pressure Science (CHiPS), State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, China.
Small (Weinheim an Der Bergstrasse, Germany)
|June 2, 2026
Summary
This study introduces nanotwin engineering to enhance the mechanical strength and thermoelectric efficiency of layered chalcogenides. This method creates robust materials for reliable thermoelectric devices.
Area of Science:
- Materials Science
- Solid State Physics
- Nanotechnology
Background:
- Layered chalcogenides offer efficient phonon transport suppression but lack mechanical robustness.
- Developing mechanically stable, high-efficiency thermoelectric materials is crucial for device applications.
Purpose of the Study:
- To address the mechanical fragility of layered chalcogenides.
- To improve thermoelectric performance through a novel structural engineering approach.
Main Methods:
- Utilized shear-strain engineering to introduce dense nanotwins in (Sb,Bi)2Si2Te6 via high-energy ball milling.
- Investigated the mechanical properties, including compressive strength and hardness.
- Measured lattice thermal conductivity and thermoelectric figure of merit (ZT).
Main Results:
- Nanotwin boundaries significantly enhanced mechanical strength (191 MPa compressive strength, 0.8 GPa hardness).
- Achieved ultralow lattice thermal conductivity (0.27 Wm-1K-1) due to broadband phonon scattering.
- Reached a peak thermoelectric figure of merit (ZT) of 1.5 at 773 K.
Conclusions:
- Nanotwin engineering successfully creates robust and high-efficiency thermoelectric materials from fragile layered crystals.
- Demonstrated a practical thermoelectric device with 8% conversion efficiency and structural integrity.
- Establishes nanotwin engineering as a generalizable strategy for advanced thermoelectric materials.
