Morphology and optical properties of thin Cd.sub.3./sub.As.sub.2./sub. films of a dirac semimetal compound

0547321 - FZÚ 2022 RIV CH eng J - Journal Article
Kovaleva, N. - Fekete, Ladislav - Chvostová, Dagmar - Muratov, A.
Morphology and optical properties of thin Cd₃As₂ films of a dirac semimetal compound.
Metals. Roč. 10, č. 10 (2020), č. článku 1398. E-ISSN 2075-4701
Institutional support: RVO:68378271
Keywords : dirac semimetals * cadmium arsenide * thin films * atomic force microscopy * spectroscopic ellipsometry
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 2.351, year: 2020
Method of publishing: Open access

Using atomic-force microscopy (AFM) and wide-band (0.02–8.5 eV) spectroscopic ellipsometry techniques, we investigated the morphology and optical properties of Cd3As2 films grown by non-reactive RF magnetron sputtering on two types of oriented crystalline substrates (100)p-Si and (001) a-Al2O3. The AFM study revealed the grainy morphology of the films due to island incorporation during the film growth. The complex dielectric function spectra of the annealed Cd3As2/Al2O3 films manifest pronounced interband optical transitions at 1.2 and 3.0 eV, in excellent agreement with the theoretical calculations for the body centered tetragonal Cd3As2 crystal structure.agreement with the theoretical calculations for the body centered tetragonal Cd3As2 crystal structure. We discovered that due to electronic excitations to the Cd(s) conical bands, the low-energy absorption edge of the annealed Cd3As2 films reveals a linear dependence.
Permanent Link: http://hdl.handle.net/11104/0323849