Power Absorption Improvement of an Ultra-Thin-Film Silicon Solar Cell Using Two Plasmonic Nanoparticles

Different methods have been utilized to improve ultra-thin-film silicon solar cells, one of which is the proposed plasmonic structure. The output efficiency of this structure compared to smaller thicknesses needs to be studied and researched. In this paper, an ultra-thin structure of a silicon cell with two nanoparticles in the neighborhood tangential to the beginning and end of the cell has been made by considering a very small radius for these two nanoparticles in two inner surfaces, which causes a significant increase in current due to the plasmonic surface effects of the nanoparticles. The results indicate that, compared to the smaller volume of metal in the proposed structure, it causes more light management in a cell and improves the output current and photon absorption. For this purpose, first, a spherical nanoparticle should be placed at the top of the inside of the active layer and then another spherical nanoparticle should be placed from the bottom inside the active layer. Depending on the wavelength of the incident light, each nanoparticle manipulates some parts of the spectrum. Finally, the distribution and generation of the electric field for the proposed structures have been calculated.