Optimization of the Thermoelectric Power Factor: Coupling between Chemical Order and Transport Properties
Journal article, 2016

Many thermoelectric materials are multicomponent systems that exhibit chemical ordering, which can affect both thermodynamic and transport properties. Here, we address the coupling between order and thermoelectric performance in the case of a prototypical inorganic clathrate (Ba8Ga16Ge30) using a combination of density functional and Boltzmann transport theory as well as alloy cluster expansions and Monte Carlo simulations. The calculations describe the experimentally observed site occupancy factors and reproduce experimental data for the transport coefficients. By inverting the cluster expansion, we demonstrate that the power factor can be increased by more than 60% for certain chemical ordering patterns that involve reducing the number of the trivalent species on the 6c Wyckoff site. This enhancement is traced to specific features of the electronic band structure. The approach taken in the present work can be readily adapted to other materials and enables a very general form of band structure engineering. In this fashion, it can guide the computational design of compounds with optimal transport properties.

Author

Mattias Ångqvist

Chalmers, Physics, Materials and Surface Theory

Daniel Lindroth

Chalmers, Physics, Materials and Surface Theory

Paul Erhart

Chalmers, Physics, Materials and Surface Theory

Chemistry of Materials

0897-4756 (ISSN) 1520-5002 (eISSN)

Vol. 28 19 6877-6885

Subject Categories

Physical Sciences

DOI

10.1021/acs.chemmater.6b02117

More information

Created

10/7/2017