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Strong and efficient bismuth telluride-based thermoelectrics for Peltier microcoolers

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Pan,  Yu
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Zhuang, H.-L., Cai, B., Pan, Y., Su, B., Jiang, Y., Pei, J., et al. (2024). Strong and efficient bismuth telluride-based thermoelectrics for Peltier microcoolers. National Science Review, 11(10): nwae329, pp. 1-10. doi:10.1093/nsr/nwae329.


Cite as: https://hdl.handle.net/21.11116/0000-0010-481E-D
Abstract
Thermoelectric Peltier coolers (PCs) are being increasingly used as temperature stabilizers for optoelectronic devices. Increasing integration drives PC miniaturization, requiring thermoelectric materials with good strength. We demonstrate a simultaneous gain of thermoelectric and mechanical performance in (Bi, Sb)2Te3, and successfully fabricate micro PCs (2 × 2 mm2 cross-section) that show excellent maximum cooling temperature difference of 89.3 K with a hot-side temperature of 348 K. A multi-step process involving annealing, hot-forging and composition design, is developed to modify the atomic defects and nano- and microstructures. The peak ZT is improved to ∼1.50 at 348 K, and the flexural and compressive strengths are significantly enhanced to ∼140 MPa and ∼224 MPa, respectively. These achievements hold great potential for advancing solid-state refrigeration technology in small spaces. © 2024 The Author(s).