I. V. Fedotova

Optical properties of ITO films obtained by high-frequency magnetron sputtering with accompanying ion treatment

A variation in the properties of indium-tin-oxide (ITO) films obtained by the method of reactive magnetron sputtering with simultaneous ion treatment is reported. The ITO films feature the following parameters in the optical range of 450–1100 nm: a transmission coefficient of 80%, band gap of 3.50–3.60 eV, and a refractive index of 1.97–2.06. All characteristics of the films depend on the ion-treatment current. The latter, during the course of deposition, reduces the resistivity of the ITO films with the smallest value of the resistivity being equal to 2 × 10−3 Ω cm. The degradation of films with a high resistivity when kept in air is observed.

The Effect of Thermal Annealing on the Structure of Nanocrystalline Zinc Sulfide Films

The effect of thermal annealing on the structure of nanocrystalline ZnS films obtained at negative (centigrade) condensation temperatures on NaCl, Si, and SiO2 substrates has been studied. It is shown that the structure of zinc sulfide films on Si and SiO2 substrates differs from that of films on NaCl substrates. The hexagonal phase appears in the films on NaCl and disappears upon annealing. The appearance and disappearance of this phase is due to the effect of stresses in the film-substrate system.

Structure and optical transmission spectra of ZnS–SiO2 nanocomposite films deposited at low temperatures

The results of studying the growth of a ZnS–SiO2 nanocomposite film by discrete thermal evaporation at lowered condensation temperatures using an ultrahigh-vacuum setup are presented. It is shown that ZnS–SiO2 nanocomposite films contain an amorphous SiO2 matrix and zinc-sulfide ZnS nanocrystals. The nanocrystallite shape and sizes depend on the condensation temperature.

Effect of ion treatment on the properties of In2O3:Sn films

Variations in the properties of Indium-Tin-Oxide (ITO) films grown by reactive HF (high-frequency) magnetron deposition with simultaneous ion treatment are studied depending on the ion-treatment current and substrate temperature. Ion treatment of the growing film during deposition insignificantly changes the relative content of tin and indium, but significantly increases the conductivity. Films obtained at a temperature below 50°C without ion treatment are X-ray amorphous. Ion treatment and an increase in the condensation temperature lead to film crystallization and a shift of the optical absorption edge to short wave-lengths. An increase in the ion-treatment current causes texture formation.

Structure and properties of nanocrystalline ZnS and ZnSe films

The influence of the condensation temperature on the structure and optical properties of ZnS and ZnSe films is studied. The presence of the hexagonal phase, along with the cubic, is revealed in films deposited on the cleaved NaCl facet. The appearance of the hexagonal phase is explained by the mechanical stress produced at the film-substrate interface.

Structure and optical properties of ZnSe/SiO2 layered nanocomposites

Structure and optical properties of ZnSe/SiO2 layered nanocomposites obtained using microwave magnetron sputtering have been studied. The nanocomposites are X-ray amorphous at relatively small thicknesses of the zinc selenide layers. When the thickness of the zinc selenide layers exceeds 20 Å, ZnSe/SiO2 films contain SiO2 amorphous phase and zinc selenide cubic nanocrystallites. It has been demonstrated that the thickness of zinc selenide layers affects the microstresses, refractive index, and band gap.

The influence of thermal annealing on the optical properties of nanocrystalline zinc sulfide films

The influence of thermal annealing on the photoluminescence, electroluminescence, and the transmission and reflection spectra in nanocrystalline zinc sulfide films has been studied. All the samples exhibit a broad emission band, the intensity of which depends on the annealing temperature. It is shown that luminophors, the crystal lattice of which includes imperfections that appeared in the transition from wurtzite to sphalerite, feature the highest emission intensity.

Production and investigation of layered zinc sulfide(selenide)/insulator nanocomposites

Layered ZnS/SiO2, ZnS/Al2O3, and ZnSe/SiO2 nanocomposites have been studied. It has been shown that the use of the Maxwell–Garnett and Bruggeman models, as well as the Luyengi formula, in the low dispersion region makes it possible to predict the production of films with a given effective refractive index. Calculated values of the refractive index correlate well with experimental data. The maximal discrepancy between the theoretical and experimental values of the refractive index and the maximal value of the depolarization factor depend on the structure and microstrains.

Effect of deposition temperature on the structure and optical properties of zinc-selenide films produced by radio-frequency magnetron sputtering

The effect of the condensation temperature on the growth rate, structure, and optical properties of zinc-selenide films produced by radio-frequency magnetron sputtering is studied. As the deposition temperature is increased, the film thickness decreases. Polycrystalline zinc-selenide films consist of a mixture of cubic and hexagonal phases, of which the cubic phase is dominant. A correlation between the refractive index and the crystallite size is shown.

Effect of thermal annealing on the structure of ZnSe/Al2O3 nanocomposite films

The ZnSe/Al2O3 nanocomposite films synthesized by laser evaporation followed by heat treatment are studied. X-ray diffraction and electron-microscopic investigations of the as-deposited films demonstrate the presence of ZnSe crystallites in an Al2O3 amorphous matrix. Annealing changes the structures of ZnSe and Al2O3, increases the ZnSe crystallite size, and causes the appearance of the ZnSeO4 phase. The presence of aluminum oxide layers decreases the phase transformation temperature of zinc selenide.