Redshift and amplitude increase in the dielectric function of corundum-like α-(Ti_<i>x</i>Ga_1−<i>x</i>)₂O₃

Redshift of the absorption onset and amplitude increase in ultraviolet complex dielectric function (DF) corundum-like [Formula: see text]-(Ti x Ga 1− ) 2 O 3 with increasing Ti content is presented. text]-Ga thin film samples alloyed up to text] are grown from plasma enhanced atomic layer deposition. They characterized by spectroscopic ellipsometry, transmission electron microscopy, x-ray photoelectron spectroscopy (XPS). The shown be crystalline text]. Ellipsometry employed obtain ordinary DF, where shows a strong red shift as well an amplitude, which associated successive take over related 3d-states density-of-states. Valence band XPS results lead conclusion that mainly due conduction lowering less valence band.