Abstract
In this paper we review the recently identified p × n-type transverse thermoelectrics and study the thermoelectric properties of the proposed candidate materials. Anisotropic electron and hole conductivity arise from either an artificially engineered band structure or from appropriately anisotropic crystals, and result in orthogonal p-type and n-type directional Seebeck coefficients, inducing a non-zero off-diagonal transverse Seebeck coefficient with appropriately oriented currents. Such materials have potential for new applications of thermoelectric materials in transverse Peltier cooling and transverse thermal energy harvesting. In this paper we review general transverse thermoelectric phenomena to identify advantages of p × n-type transverse thermoelectrics compared with previously studied transverse thermoelectric phenomena. An intuitive overview of the band structure of one such p × n-material, the InAs/GaSb type-II superlattice, is introduced, and the plot of thermoelectric performance as a function of superlattice structure is calculated, as an example of how band structures can be optimized for the best transverse thermoelectric performance.
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The authors wish to acknowledge support from the Northwestern EECS Bridge grant and ISEN Booster grant, as well as support from the NSF MRSEC DMR-1121262 and AFOSR FA9550-12-1-0169.
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Tang, Y., Cui, B., Zhou, C. et al. p × n-Type Transverse Thermoelectrics: A Novel Type of Thermal Management Material. J. Electron. Mater. 44, 2095–2104 (2015). https://doi.org/10.1007/s11664-015-3666-z
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DOI: https://doi.org/10.1007/s11664-015-3666-z