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This is a Experimental Study study.

September 20, 2025Advanced Functional Materials

High ZT >1.4 Realized in Bi2Se2S via Amorphous–Crystalline Coexistence Structure of Secondary Phase and Bilayer Rotation

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Authors

KHKevin Huang CWChong‐Yu Wang YHY. C. Hu

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Overview

TeCl4 doping optimizes electrical and thermal transport in Bi2Se2S, achieving a ZT of 1.44 at 773 K, suggesting potential for mid-temperature thermoelectric applications.

Key Points

A ZT of 1.44 at 773 K is achieved through bilayer rotation and structural changes in Bi2Se2S.
Doping with TeCl4 narrows the bandgap from 1.07 eV to 0.88 eV, enhancing thermoelectric efficiency with a power factor of 800 µW·m−1·K−2.
The introduction of periodic moiré fringes and lattice distortions reduces lattice thermal conductivity to 0.27 W·m−1·K−1, supporting a high ZT.
This work paves the way for the first n-type thermoelectric module using Bi2Se2S, demonstrating notable efficiency under varying temperature differences.

Cite This Study

Huang et al. (2025) studied this question.

synapsesocial.com/papers/68d46aae31b076d99fa67840 https://doi.org/10.1002/adfm.202518982

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September 20, 2025Advanced Functional Materials

High ZT >1.4 Realized in Bi2Se2S via Amorphous–Crystalline Coexistence Structure of Secondary Phase and Bilayer Rotation

View Full Paper

Ask AI

Bookmark

Authors

KHKevin Huang CWChong‐Yu Wang YHY. C. Hu

Discussion

Member takes

Overview

TeCl4 doping optimizes electrical and thermal transport in Bi2Se2S, achieving a ZT of 1.44 at 773 K, suggesting potential for mid-temperature thermoelectric applications.

Key Points

A ZT of 1.44 at 773 K is achieved through bilayer rotation and structural changes in Bi2Se2S.
Doping with TeCl4 narrows the bandgap from 1.07 eV to 0.88 eV, enhancing thermoelectric efficiency with a power factor of 800 µW·m−1·K−2.
The introduction of periodic moiré fringes and lattice distortions reduces lattice thermal conductivity to 0.27 W·m−1·K−1, supporting a high ZT.
This work paves the way for the first n-type thermoelectric module using Bi2Se2S, demonstrating notable efficiency under varying temperature differences.

Cite This Study

Huang et al. (2025) studied this question.

synapsesocial.com/papers/68d46aae31b076d99fa67840 https://doi.org/10.1002/adfm.202518982

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