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Numerical investigation of the maximum thermoelectric efficiency

Abstract : The maximum thermoelectric efficiency that is given by the so-called dimensionless figure of merit ZT is investigated here numerically for various energy dependence. By involving the electrical conductivity σ, the thermopower α, and the thermal conductivity κ such that ZT = α 2 × σ × T/κ, the figure of merit is computed in the frame of a semiclassical approach that implies Fermi integrals. This formalism allows us to take into account the full energy dependence in the transport integrals through a previously introduced exponent s that combines the energy dependence of the quasiparticles' velocity, the density of states, and the relaxation time. While it has been shown that an unconventional exponent s = 4 was relevant in the context of the conducting polymers, the question of the maximum of ZT is addressed by varying s from 1 up to 4 through a materials quality factor analysis. In particular, it is found that the exponent s = 4 allows for an extended range of high figure of merit toward the slightly degenerate regime. Useful analytical asymptotic relations are given, and a generalization of the Chasmar and Stratton formula of ZT is also provided.
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https://hal-univ-tours.archives-ouvertes.fr/hal-03192476
Contributor : Patrice Limelette <>
Submitted on : Thursday, April 8, 2021 - 8:44:51 AM
Last modification on : Saturday, April 10, 2021 - 3:21:06 AM

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Patrice Limelette. Numerical investigation of the maximum thermoelectric efficiency. AIP Advances, American Institute of Physics- AIP Publishing LLC, 2021, 11, ⟨10.1063/5.0041224⟩. ⟨hal-03192476⟩

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