Ellipsometric diagnostics of hybrid organic-inorganic films of copper thiocyanate CuSCN with stilbazolium dye of different concentrations was carried out. The investigated samples with 4-(N,N-dimethylamino)-4′-(N′-methyl) stilbazolium tosylate concentrations of 0, 25, 250 and 1000 mol/dm 3 were deposited on F-doped tin oxide substrate. To characterize the optical properties of hybrid organic-inorganic films, the angular dependences of such ellipsometric parameters as the phase shift Δ between p-and s-components of the polarization vector and the azimuth Ψ of the restored linear polarization were measured within a wide range of light incidence angles. Due to their angular dependences, the principal angle p of light incidence and the value of tgmin were determined. To characterize the electronic properties of the subsurface layers of the investigated hybrid organic-inorganic films, the refractive n and absorption k indices and the optical conductivity were defined according to the semi-infinite medium approximation. It was found that an increase in the concentration of stilbazolium dye in hybrid organic-inorganic films from 25 to 250 mol/dm 3 leads to an increase in the principal angle of light incidence and the refractive index. However, the behavior of the ellipsometric parameters of a film with a maximum dye concentration of 1000 μmol/dm 3 cannot be explained only by an increase in the dye concentration. It was assumed that this modification of the optical properties of hybrid organic-inorganic films with a maximum dye concentration is associated with a structural phase transition from the rhombohedral -phase to the orthorhombic α-phase of CuSCN at high dye concentrations, which is confirmed by X-ray diffraction data presented in other works. It is concluded that there is no optical anisotropy of the subsurface layers of the studied samples.
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