Application Of Ag Nanoparticles In Solar Cell, Magnetic Fano Resonance And Organic Catalysis

Plasmonic optics which is based on the surface Plasmon has become an important research point in many fields such as Physics, Chemistry, materials and Biology. Surface Plasmon is an electromagnetic wave caused by the oscillation of free electron on the metal surface. The oscillation is formed by the electromagnetic field of incident light and the free electrons on metal surface. The electromagnetic field on metal surface will be trapped and enhanced when the frequency of incident light is coordinate with inherent frequency of free electron on metal surface. This phenomenon makes the metal with nanostructure has a unique properties. More importantly, there is a strong enhancement of electromagnetic field between the nanoparticles in nano-system. The incident light can be tuned by the size of nano-metal particles, the refractive index of metal, the parameters of medium around metal, the angle and type of incident light. So the sub-wavelength nanostructure has been applied into optics advice such as medical, optical sensor, solar cells, biology catalysis and astronomy and so on.Due to the special properties of surface Plasmon, it has been made great achievement in plasmonic solar cells, biology, catalysis and astronomy. In this paper, we mainly studied the three aspects of surface Plasmon. Firstly, we design a proper nano metal structure system. Then the optical properties such as the absorption spectra, scattering spectra, extinction spectra are computed by Comsol Multyphysics which is based on the Finite Element Method ?FEM?. By analyzing the electric field distribution, magnetic field distribution and the current density of absorption peaks or extinction peaks, we can make a conclude about the generation of all the extinction peaks. There are three main The first aspect:the broadband absorption efficiency of Plasmonic thin-film solar cellsIn this paper, the surface of the solar cell is designed by grating surface instead of smooth surface, and there are silver nanoparticle array in the bottom of the cell. We analyzed the absorption efficiency and electric field distribution at absorption peaks of thin-film solar cells which is made of a-Si. Then we optimize all results of the structure by Comsol Multyphysics. The results show that grating surface contributes to the absorption of the solar cell. The absorption efficiency is more than 90% in the wavelength from 400 nm to 700 nm. More importantly, the embedded silver nanoparticle is benefit to the absorption of a-Si at the wavelength from 700?900 nm. The second aspects:Magnetic-based Fano resonances in a plasmonic trimerWe divided a silver disk by a Y-shaped gap into a trimer. Then the extinction cross-section was calculated, we pick out the extinction peaks. The electromagnetic field, the charge distribution and the current density of these extinction peaks are analyzed by the software. We found that there is a strong magnetic resonance in the longer wavelength, a dark magnetic resonance and a bright electric resonance at the short wavelength. The interaction between the dark magnetic resonance and the bright electric resonance generates a Fano resonance. The Fano resonance can be manipulate by the parameters such as the gap of the Y-shape, the radius of the disk, and the position of Y-shaped gap. More importantly, this Fano resonance can be applied into Optics sensors. The third aspect:the optical manipulation of TiO₂/silvercore/shell nanostructureThe absorption efficiency of core-shell is calculated after we designed a noble metal nanostructure. It can be seen from the results that when the radius or the thick of the shell is changed, the absorption peaks are changed. We can shift the absorption peaks to the visible region. By this law, and this structure can be used in catalytic of organic pollutants.