Dresden 2020 – scientific programme

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DS: Fachverband Dünne Schichten

DS 43: Thin Film Properties: Structure, Morphology and Composition II

DS 43.2: Talk

Thursday, March 19, 2020, 17:00–17:15, CHE 89

Broad Absorptance Behavior of High Entropy Oxide (MgCoNiCuZn)O — •Maria Barrera, Emeline Michele, Lars Wening, and Matthias Wuttig — IA Instutute of Physics RWTH Aachen University, Aachen, Germany

Near-equimolar High Entropy Oxides (HEO), which are stabilized due to the entropy-driven formation of simple-phases, provide an interesting combination of properties including colossal dielectric constants. (MgCoNiCuZn)O high entropy oxide films have been deposited onto silicon and glass via reactive magnetron sputtering using a MgCoNiCuZn target. Thin films show an unusually broad absorptance (1-R-T) ranging from the ultraviolet to the near-infrared regime. The origin of this unconventional absorption is related to the crystallographic structure, grain size, and composition for films deposited at different oxygen partial pressures.