Breaking the transport trade-off in Bi2Te3 films via interface reconstruction and magnetic coupling

Mingdi Lan; Lifeng Jiang; Ming Liu; Muchun Guo; Pengyuan Zhang; Dongbo Wang; Yuke Zhu; Huijun Kang; Jiehe Sui

doi:10.59717/j.tip.2026.100014

The Innovation Physics > 2026 Vol. 1 > No. 1 > 100014

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Breaking the transport trade-off in Bi₂Te₃ films via interface reconstruction and magnetic coupling

1.
Key Laboratory of Precision Hot Forming change to National Key Laboratory of Precision Hot Forming, Harbin Institute of Technology, Harbin 150001, China
2.
Key Laboratory of Solidification Control and Digital Preparation Technology, School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
3.
School of Materials Science and Engineering, Xihua University, Chengdu 610039, China

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These authors contributed equally
Corresponding authors: mingliu@hit.edu.cn (M.L.); kanghuijun@dlut.edu.cn (H.K.); suijiehe@hit.edu.cn (J.S.)
Received Date: June 15, 2026

Accepted Date: August 20, 2026

Published Online: August 20, 2026

The Innovation Physics 1(1), https://doi.org/10.59717/j.tip.2026.100014 | Cite this article

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PUBLIC SUMMARY

PUBLIC SUMMARY
1. Bi₂Te₃ films are promising for compact thermoelectric generators and light detectors.
  
  PEF treatment crystallizes key interfaces and reduces carrier scattering.
  
  Magnetic Co nanoparticles tune carrier transport through magnetoelectric interaction.
  
  The optimized film improves thermoelectric output and ultraviolet photodetection.

ABSTRACT

ABSTRACT

Bi₂Te₃ films play a pivotal role in semiconductor applications, particularly for thermoelectric and photo-thermoelectric energy conversion. Doping is the primary method to regulate their functional properties, yet parameter trade-offs cap the achievable power factor and detectivity. Here, we introduce a synergistic strategy combining pulsed electric field (PEF) treatment with magnetic nanoparticle incorporation to achieve the decoupling of electrical transport parameters. PEF treatment facilitates the crystallization of the carbon nanotube (CNT)/Bi₂Te₃ interface and the formation of a coherent Co/CoTe₂/Bi₂Te₃ interface, which increases carrier transport pathways while reducing carrier scattering, significantly enhancing carrier mobility. Magnetic Co nanoparticle incorporation induces magnetoelectric interaction, boosting the density-of-states effective mass, while both Co nanoparticles induce carrier injection, increasing the carrier concentration. Consequently, a synergistic enhancement of carrier mobility, density-of-states effective mass, and carrier concentration is realized in Bi₂Te₃ film. Furthermore, we fabricated single-leg thermoelectric and optoelectronic devices that achieve high output power density of 10.26 W m⁻² at a temperature difference of 39 K and excellent detectivity of 5.95×10⁹ Jones at 365 nm light illumination, respectively. This work highlights the significant role of interface modulation and magnetoelectric interaction in regulating electrical transport properties.
- Bi₂Te₃ /
- pulsed electric field treatment /
- interface modulation /
- magnetoelectric interaction /
- electrical transport properties

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Lan M., Jiang L., Liu M., et al. (2026). Breaking the transport trade-off in Bi2Te3 films via interface reconstruction and magnetic coupling . The Innovation Physics 1:100014. https://doi.org/10.59717/j.tip.2026.100014

Lan M., Jiang L., Liu M., et al. (2026). Breaking the transport trade-off in Bi₂Te₃ films via interface reconstruction and magnetic coupling . The Innovation Physics 1:100014. https://doi.org/10.59717/j.tip.2026.100014

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Breaking the transport trade-off in Bi₂Te₃ films via interface reconstruction and magnetic coupling

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