Insights into the thermoelectric properties of SnSe from ab initio calculations

Author(s)

Gonzalez-Romero, Robert L. ; Antonelli, Alex ; Melendez, Juan J.

• Document type: Journal article
• Source: Physical Chemistry Chemical Physics; v. 19, n. 20, p. 12804-12815, MAY 28 2017.
• Web of Science Citations: 20

Abstract

The thermoelectric properties of SnSe are studied by first-principles methods using an original methodology. We computed first the electronic structure of the system, which justifies its macroscopic anisotropy; the inclusion of van der Waals dispersive corrections improves the agreement of the structural parameters with experiments. The Seebeck coefficient and the electrical and thermal conductivities of single crystals and polycrystals are subsequently described in good agreement with experimental data. As for the electrical conductivity, values calculated with a temperature-dependent relaxation time compare well with the available measurements, especially for single crystals; in contrast, a constant relaxation time suffices to describe the results for polycrystals. Based on the iterative solution of the Boltzmann transport equation for phonons, we discuss the behavior of the thermal conductivity of the system in terms of its phonon spectrum. Finally, the figure of merit of SnSe single crystals and polycrystals is calculated and correlated with the previous discussions about electrical and thermal conductivities. From these findings, possible strategies to increase the figure of merit in practice are suggested. (AU)

• FAPESP's process: 13/08293-7 - CCES - Center for Computational Engineering and Sciences
• Grantee: Munir Salomao Skaf
• Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC
• FAPESP's process: 13/14065-7 - A first-principles study of electronic, structural, and transport properties of clathrates for thermoelectric applications
• Grantee: Robert Luis González Romero
• Support type: Scholarships in Brazil - Post-Doctorate