Mechanically-Exfoliated Stacks of Thin Films of Bi2Te3 Topological Insulators with Enhanced Thermoelectric Performance

By V. Goyal, D. Teweldebrhan, Alexander A. Balandin. 2010

173 citations recorded by the source corpus.

The authors report on “graphene-like” mechanical exfoliation of single-crystal Bi2Te3 films and thermoelectric characterization of the stacks of such films. Thermal conductivity of the resulting “pseudosuperlattices” was measured by the “hot disk” and “laser flash” techniques. The room temperature in-plane (cross-plane) thermal conductivity of the stacks decreases by a factor of ∼2.4 (3.5) as compared to bulk. The thermal conductivity reduction with preserved electrical properties leads to strong increase in the thermoelectric figure of merit. It is suggested that the film thinning to few-quintuples and tuning of the Fermi level can help in achieving the topological-insulator surface transport regime with an extraordinary thermoelectric efficiency.

Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/36ee46b10439661f1c4b014ddf700972395e9c4c

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In Atomic and Molecular Physics, and Optics

1. Xiaobo Yin
2. Ronggui Yang
3. Baowen Li

In Materials Chemistry

1. Xiaobo Yin
2. Yujie Wei
3. Baowen Li
4. Xiaokun Gu
5. Ronggui Yang
6. Gang Zhang
7. Gang Chen
8. Yong‐Wei Zhang

Citations in the corpus

• Colloquium: Phononic thermal properties of two-dimensional materials (2017, methodology): “Stacking the exfoliated Bi2Te3 thin films to form the “pseudosuperlattice” has been proven as an effective method to reduce the thermal conductivity from the bulk value (Goyal, Teweldebrhan, and Balandin, 2010; Teweldebrhan, Goyal, and Balandin, 2010).”