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Interface-Engineered Bi_0.5Sb_1.5Te₃/WSe₂ Heterostructures for Enhanced Thermoelectric Performance.

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

¹Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsin-Chu, Taiwan.

Small (Weinheim an Der Bergstrasse, Germany)

|January 12, 2026

Summary

This summary is machine-generated.

This study explores BST/WSe2 heterostructures for thermoelectric applications. Interfacial engineering significantly enhances thermoelectric performance by optimizing carrier generation and energy filtering.

Keywords:

BST/WSe2 heterostructure energy filtering interface engineering pulsed laser deposition thermoelectric materials

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Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Thermoelectric materials convert heat to electricity.
Optimizing heterostructures is key to improving thermoelectric efficiency.
Understanding interfacial effects in layered materials is crucial.

Purpose of the Study:

To investigate the impact of interfacial structure and composition on the thermoelectric properties of BST/WSe2 heterostructures.
To correlate structural characteristics with thermoelectric performance metrics.
To explore mechanisms enhancing the Seebeck coefficient and power factor.

Main Methods:

Pulsed laser deposition for BST/WSe2 heterostructure fabrication.
X-ray diffraction and Cs-STEM for structural and compositional analysis.
Temperature-dependent electrical transport measurements.

Main Results:

High crystallinity and lattice compression observed in BST/WSe2 heterostructures.
Interfacial strain and moiré patterns influence band structure, leading to band flattening.
Enhanced electrical conductivity and high Seebeck coefficients (>430 µV K-1) due to thermally activated carriers and interfacial energy filtering.
Formation of internal p-n junction-like regions within WSe2 domains tunes carrier concentration.
Thermally stable power factor exceeding 50 µW cm-1 K-2 achieved.

Conclusions:

Interfacial engineering in BST/WSe2 heterostructures is a viable strategy for high-performance thermoelectrics.
Lattice strain and moiré reconstruction play a significant role in enhancing thermoelectric properties.
The observed phenomena pave the way for designing advanced thermoelectric materials.