Получены спектры модуля комплексной проводимости тонких композитных плёнок двух серий. Получена модель описывающая поведение модуля проводимости в диапазоне частот от 9кГц до 2ГГц

The solid-phase photocatalytic degradation of low density polyethylene (LDPE) with sol-gel synthesized TiO2 nanoparticles as photocatalyst was investigated under ultraviolet (UV) irradiation in ambient air conditions. TiO2 nanoparticles were synthesized by optimizing various parameters and the TiO2 nanoparticles were dispersed in LDPE using cyclohexane solution. This TiO2-PE nanocomposite was made in the form of thin films of 40 m size by facile solution casting method and studied photodegradation of these films. A comparative study on the photodegradation of two different sized TiO2 incorporated LDPE under UV radiation was carried out. Polyethylene film incorporated with TiO2 nanoparticles of size 50nm showed higher degradation rate under UV radiation. Partial oxidation was confirmed from the IR spectrum of the TiO2 incorporated polyethylene film after radiation exposure.SEM analysis and AFM nanoindentation measurements confirms the degradation. A possible mechanism of TiO2 assisted degradation of the polyethylene matrix has also been proposed.

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We report on the development and application of p- and n-type hydrogenated microcrystalline silicon oxide (μc-SiOx:H) alloys in tandem thin film silicon solar cells. Our results show that the optical, electrical, and structural properties of μc-SiOx:H can be conveniently tuned over a wide range to fulfil the requirements for solar cell applications. We have shown that adding of PH3 gas during deposition tends to increase crystallinity of μc-SiOx:H layers, while additional trimethylboron (TMB) tends to suppress crystalline growth. When applied in tandem solar cells, both p- and n-type μc-SiOx:H lead to a remarkable increase in the top cell current. Taking advantage of low refractive index and high optical band gap of μc-SiOx:H allows the achievement of high efficiencies of 13.1% (initial) and 11.8% (stabilized).

Bi1−xSbx solid solutions have attracted much attention as promising thermoelectric (TE) materials for cooling devices at temperatures below ∼200 K and as unique model materials for solid-state science because of a high sensitivity of their band structure to changes in composition, temperature, pressure, etc. Earlier, we revealed a non-monotonic behavior of the concentration dependences of TE properties for polycrystalline Bi1−xSbx solid solutions and attributed these anomalies to percolation effects in the solid solution, transition to a gapless state, and to a semimetal–semiconductor transition. The goal of the present work is to find out whether the non-monotonic behavior of the concentration dependences of TE properties is observed in the thin film state as well. The objects of the study are Bi1−xSbx thin films with thicknesses in the range d = 250–300 nm prepared by thermal evaporation of Bi1−xSbx crystals (x = 0–0.09) onto mica substrates. It was shown that the anomalies in the dependence of the TE properties on Bi1−xSbx crystal composition are reproduced in thin films.