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The best thermoelectric.

G D Mahan1, J O Sofo

  • 1Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996, USA.

Proceedings of the National Academy of Sciences of the United States of America
|July 23, 1996
PubMed
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A delta-shaped electronic structure maximizes thermoelectric materials

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid-State Chemistry

Background:

  • Thermoelectric materials convert heat to electricity.
  • Optimizing thermoelectric efficiency is crucial for energy harvesting.
  • Current materials face limitations in their figure of merit.

Purpose of the Study:

  • To identify the optimal electronic structure for maximizing thermoelectric materials' figure of merit.
  • To understand the relationship between electronic structure and thermoelectric properties.

Main Methods:

  • Expressing electrical conductivity, thermopower, and thermal conductivity as integrals of a single function.
  • Deriving the mathematical function for the transport distribution that maximizes the figure of merit.

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Main Results:

  • A delta-shaped transport distribution maximizes the thermoelectric figure of merit.
  • This indicates a narrow distribution of electron energies is key for high thermoelectric efficiency.

Conclusions:

  • The ideal electronic structure for thermoelectric materials features a narrow energy distribution of charge carriers.
  • This finding guides the design of novel, high-performance thermoelectric materials.