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Thermoelectric Module For Low Temperature Applications

  • Sangeeta Lal (a1), Sim Loo (a1), Duck-Young Chung (a2), Theodora Kyratsi (a2), Mercouri G. Kanatzidis (a2), Charles Cauchy (a3) and Timothy P. Hogan (a1)...

Abstract

The possibility of a prototype thermoelectric cooling device for operation near liquid nitrogen temperatures has been explored. In these devices, the figure of merit involves a combination of the properties of the two branches of the module. Here, we investigate the fabrication of a module with a new low temperature material, CsBi4Te6 (p-type), and the best known low temperature n-type materials Bi85Sb15. Transport measurements for each of these materials show high performance at low temperatures. Known values for the figure of merit Zmax of CsBi4Te6 is 3.5 × 10−3 K−1 at 225K and for Bi85Sb15 is 6.5 × 10−3 K−1 at 77K. At 100K these values drop to 2.0×10−3 K−1 for CsBi4Te6 and 6.0×10−3 K−1 for Bi85Sb15. Theoretical simulations based on these data show a cooling of δT = 12K at 100K, which is almost three times the efficiency of a Bi2Te3 module at that temperature. We present transport measurements of elements used in the fabrication of a low temperature thermoelectric module and properties of the resulting module.

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1 Chung, D.-Y., Hogan, T., Brazis, P., Rocci-Lane, M., Kannewurf, C., Bastea, M., Uher, C., Kanatzidis, M. G., “CsBi4Te6: A High-Performance Thermoelectric Material for Low-Temperature Applications,” Science, Vol. 287, pp. 10241027, 2000.
2 Yim, W. M., Amith, A., “Bi-Sb Alloys for Magneto-Thermoelectric and Thermomagnetic Cooling,” Solid State Electronics, Vol 15, pp. 11411165, 1972.
3 Smith, G. E., and Wolfe, R., “Thermoelectric Properties of Bismuth-Antimony Alloys,” Journal of Applied Physics, Vol. 33, No. 3, pp, 841846, 1962.
4 Hogan, T. et al. , “Transport Measurement System for Characterization of New Thermoelectric Materials,” Proceedings of the 18th International Conference on Thermoelectrics, Baltimore, MD, 1999.
5 Maldonado, O., “Pulsed Method for Simultaneous Measurement of Electric Thermopower and Heat Conductivity at Low Temperatures,” Cryogenics, Vol. 32, No. 10 (1992), pp. 908912.

Thermoelectric Module For Low Temperature Applications

  • Sangeeta Lal (a1), Sim Loo (a1), Duck-Young Chung (a2), Theodora Kyratsi (a2), Mercouri G. Kanatzidis (a2), Charles Cauchy (a3) and Timothy P. Hogan (a1)...

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