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HL: Fachverband Halbleiterphysik

HL 75: Poster IIIB

HL 75.2: Poster

Donnerstag, 19. März 2020, 15:00–17:30, P2/3OG

Temperature dependent optical properties of CuI thin film — •Jan Kremkow, Vitaly Zviagin, Evgeny Krüger, Chang Yang, Chris Sturm, and Marius Grundmann — Universität Leipzig, Felix-Bloch-Institut für Festkörperphysik

We present the optical properties of copper iodide (CuI) thin film fabricated by reactive sputtering at 360 ^∘C on c-sapphire substrate. The dielectric function (DF) was determined by the means of spectroscopic ellipsometry in a wide spectral range (0.5 eV - 8.5 eV) and in the temperature range from 10 K to 300 K. The DF line-shape was initially determined numerically and consequently parametrized by a series of model functions. The DF spectra was found to be dominated by electronic transitions involving the Γ- and L- symmetry points of the CuI Brillouin zone.[1] Their evolution with temperature is investigated with respect to the Bose-Einstein model approximation. The results show a general agreement with literature and give insight into the temperature dependence of CuI electronic structure. [1] E. Krüger et al., Appl. Phys. Lett. 113, 172102 (2018).