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The results of the synthesis of Ag-TiO 2 nanostructures were presented. The optical properties of silver nanoparticles and Ag-TiO 2 structures were studied. The size and shape of Ag-TiO 2 nanostructures were determined. The electron density in silver, the damping constant of plasma oscillations, and the ratio between the masses of the Ag core and the TiO 2 shell were determined from the absorption spectra of Ag and Ag-TiO 2 solutions. It was shown that the semiconductor shell of titanium dioxide leads to a decrease in the electron density in silver nanoparticles and the damping constant of plasma oscillations.

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The effect of silver nanoparticles (NPs) on the spectral-luminescence and lasing properties of an ethanolic solution of positive solvatochromic merocyanine dye is studied. Increases in the absorption cross section, intensity, and duration of dye fluorescence are observed upon the addition of NPs to the solution. This leads to a decrease in the merocyanine lasing threshold. As a result, laser generation can be obtained in the presence of silver NPs (С Ag = 10 −12 mol/L) at a dye concentration (10-4 mol/L) at which it cannot be achieved in the absence of NPs. It is noteworthy that the power density of laser pumping in the former case is lower than in the latter case.

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In this work, the effect of Ag@SiO 2 core-shell nanostructure (NS) on photovoltaic characteristics of polymer solar cell has been studied. Addition of Ag@SiO 2 nanostructure containing SiO 2 dielectric shell into the polymer solar cell eliminates the influence of metal nanoparticles (NP) to electron transfer between the polymer and the metal nanoparticles. The efficiency of the polymer solar cell was increased by 60% for the optimal concentration of Ag@SiO 2 NSs (10 À8 mol/L) in the PEDOT:PSS film. The increased efficiency of the polymer solar cell with inclusion of Ag@SiO 2 nanostructure in PEDOT:PSS film was ascribed to a decrease of the electrical resistance of the PEDOT:PSS layer and enhancement of light harvesting by light scattering of Ag@SiO 2 nanostructure in the polymer solar cell. The mechanism and kinetics of the plasmonic enhanced polymer solar cell were explained by IPCE, time-resolved photoluminescence spectroscopy, and EIS studies.

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