Jump to main content
Jump to site search

Issue 47, 2014
Previous Article Next Article

Band convergence in the non-cubic chalcopyrite compounds Cu2MGeSe4

Author affiliations


Inspired by recent theoretical predictions on band convergence in the tetragonal chalcopyrite compounds, we have explored the influence of the crystal structure on the transport and bandstructure of different quaternary chalcopyrites. In theory, a changing lattice parameter ratio of c/2a towards unity should lead to band convergence due to a more cubic and higher symmetry structure. In accordance with this prediction, the different solid solutions explored in this manuscript show a significant impact on the electronic transport depending on the ratio of the lattice parameters. An increasing lattice parameter ratio results in an increase of the carrier effective masses which can be explained by converging bands, ultimately leading to an increase of the power factor and thermoelectric figure of merit in the class of non-cubic chalcopyrite compounds Cu2MGeSe4. However, the calculations via density functional theory show that the critical value of c/2a, where band convergence occurs, will be different from unity due to symmetry and chemical influences on the band structure.

Graphical abstract: Band convergence in the non-cubic chalcopyrite compounds Cu2MGeSe4

Back to tab navigation

Supplementary files

Publication details

The article was received on 01 Oct 2014, accepted on 27 Oct 2014 and first published on 27 Oct 2014

Article type: Paper
DOI: 10.1039/C4TC02218A
J. Mater. Chem. C, 2014,2, 10189-10194

  •   Request permissions

    Band convergence in the non-cubic chalcopyrite compounds Cu2MGeSe4

    W. G. Zeier, H. Zhu, Z. M. Gibbs, G. Ceder, W. Tremel and G. J. Snyder, J. Mater. Chem. C, 2014, 2, 10189
    DOI: 10.1039/C4TC02218A

Search articles by author