Antireflection coating on silicon, a high refractive index substrate, was theoretically investigated. The effects of antireflection coating on electrical parameters such as the short circuit current, open circuit voltage, maximum current density, maximum voltage, maximum power, power density, and conversion efficiency of the solar cell were simulated. Various previous works in which solar cell efficiencies were investigated after applying double layer antireflection coating (DLARC) were reviewed. Ti 2 O 3 and MgF 2 were then applied in a DLARC design, taking into consideration the refractive index dispersion of the two materials. The results were compared with other works in the solar spectral range (400-1200 nm). As a result of simulation, the reflectance on the surface was reduced from 30.2% to 2.37%. Moreover, about 22% conversion efficiency and 38.6 mA/ cm 2 short circuit current density were achieved for a silicon cell with DLARC. These results were compared with the parameters of a cell without coating, one with single layer coating, and one with zero reflectance on the front surface.
DC glow discharge plasma of power 40 W was applied to step index polymer optical fibers for different exposure times. Nitrogen, oxygen, and hydrogen gases were used to obtain the glow discharge. The fiber core material was poly methyl methacrylate and the cladding was fluorinated polymer. The effect of plasma on the optical parameters, such as core index profile, cladding index, and the numerical aperture, was studied by multiple beam interference fringes and Fourier transformation of infrared spectroscopy spectra. It was found that the plasma treatment affected the optical parameters of both the cladding and the core regions of optical fibers. The optical parameters also changed with the treatment time. The hydrogen plasma had effects greater than those of nitrogen and oxygen plasma. These observed results can be explained by the effect of the electric field during plasma treatment. The studied optical fibers after plasma treatment can be used as inverted-graded index with its important applications.
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