Optical properties of Agx Cu1- x I alloy thin films
Krueger E, Seifert M, Gottschalch V, Krautscheid H, Schnohr CS, Botti S, Grundmann M, Sturm C (2023)
Publication Type: Journal article
Publication year: 2023
Journal
Book Volume: 13
Article Number: 035117
Journal Issue: 3
DOI: 10.1063/5.0137091
Abstract
We report on the excitonic transition energy E0 and spin-orbit split-off energy Δ0 of γ-AgxCu1-xI alloy thin films studied by using reflectivity measurements at temperatures between 20 K and 290 K. The observed bowing behavior of the E0 transition as a function of the alloy composition is explained based on first-principles band structure calculations in terms of different physical and chemical contributions within the description of ordered alloys. The spin-orbit coupling is found to increase from a value of 640 meV for CuI to approximately 790 meV for AgI. Furthermore, we show that the temperature-dependent bandgap shift between 20 K and 290 K decreases with increasing Ag-content from 25 meV for CuI to 6 meV for AgI. We attribute this behavior mostly to changes in the contribution of thermal lattice expansion to the bandgap shift.
Involved external institutions
Germany (DE)How to cite
APA:
Krueger, E., Seifert, M., Gottschalch, V., Krautscheid, H., Schnohr, C.S., Botti, S.,... Sturm, C. (2023). Optical properties of Agx Cu1- x I alloy thin films. AIP Advances, 13(3). https://doi.org/10.1063/5.0137091
MLA:
Krueger, Evgeny, et al. "Optical properties of Agx Cu1- x I alloy thin films." AIP Advances 13.3 (2023).
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