Dielectric function of CuBrx I1-x alloy thin films
Seifert M, Krueger E, Bar MS, Merker S, Von Wenckstern H, Krautscheid H, Grundmann M, Sturm C, Botti S (2022)
Publication Type: Journal article
Publication year: 2022
Journal
Book Volume: 6
Article Number: 124601
Journal Issue: 12
DOI: 10.1103/PhysRevMaterials.6.124601
Abstract
We study the dielectric function of CuBrxI1-x thin film alloys using spectroscopic ellipsometry in the spectral range between 0.7 eV and 6.4 eV, in combination with first-principles calculations based on density functional theory. Through the comparison of theory and experiment, we attribute features in the dielectric function to electronic transitions at specific k-points in the Brillouin zone. The observed band gap bowing as a function of alloy composition is discussed in terms of different physical and chemical contributions. The band splitting at the top of the valence band due to spin-orbit coupling is found to decrease with increasing Br-concentration, from a value of 660 meV for CuI to 150 meV for CuBr. This result can be understood considering the contribution of copper d orbitals to the valence band maximum as a function of the alloy composition.
Involved external institutions
Germany (DE)How to cite
APA:
Seifert, M., Krueger, E., Bar, M.S., Merker, S., Von Wenckstern, H., Krautscheid, H.,... Botti, S. (2022). Dielectric function of CuBrx I1-x alloy thin films. Physical Review Materials, 6(12). https://doi.org/10.1103/PhysRevMaterials.6.124601
MLA:
Seifert, Michael, et al. "Dielectric function of CuBrx I1-x alloy thin films." Physical Review Materials 6.12 (2022).
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