Efficiency Enhancement of Silicon Photovoltaic Cells by Radiating (CO2) Pulses Laser

Abstract

Using Radiation Technology by laser pulsation it does not need to bring samples but it could be irradiating by pulses laser co2 into small spaces being taken into account so as not to make damages on sample during irradiating. Laser devices provide a large quantity of power precisely in exact area of material in order to make required response, particularly in dim materials. The power has been absorbed near the surface which leads to change the chemistry of surface, crystal structure or form change with different degrees without change in properties of material. The aim of thesis, to concerning or treating photovoltaic solar cell by laser pulsation that makes grooves on surface of cell with various distances and depths that lead to increase cell absorption to photovoltaic solar cell has been incidence on it. In this study many of photovoltaic solar cells been radiated in two dimensions in different ranges 3 cm x 3 cm, 2 cm x 2 cm, 1 cm x 1 cm by carbon dioxide laser. Photovoltaic solar cell has been tested before and after radiation process taken in account fill factor and efficiency of photovoltaic solar cell and the comparison between them. That is remarkable, increasing in fill factor and efficiency of photovoltaic after radiation, so we found fill factor before irradiation 0.683, and after irradiation process for the three dimensions respectively 0.742, 0.752 and 0.768 The efficiency of photovoltaic before irradiation 11 and after irradiation 12.25, 12.94 and 13.28 respectively. Photovoltaic solar cell has been studied before & after irradiation process by scanning electron microscope. This showed the presence of grooves on the surface of the photovoltaic solar cell after radiated by laser pulses. The use of surface irradiation laser technology (CO2) increase the absorption of the solar radiation in the Silicon photovoltaic cause nano/micro structure in the silicon surface, which is turn increase the efficiency of the silicon photovoltaic cell