Photovoltaic system Photovoltaic power generation

Solar cells work by converting the energy from incoming light into an electrical current. When light hits the solar cell, it is absorbed by the interface layer. This absorption process excites electrons in the P-type and N-type silicon and creates electron-hole pairs. The separation of these charges creates an electric field that drives the electrons towards the N-type region and the holes towards the P-type region. This separation creates a measurable voltage between the two regions, which can be detected by connecting a voltmeter. Typically, the open circuit voltage for crystalline silicon solar cells is between 0.5 and 0.6 volts. The amount of current generated by the solar cell is directly proportional to the number of electron-hole pairs generated in the interface layer and the surface area of the interface layer. Therefore, the more light energy absorbed by the interface layer, the greater the current generated by the solar cell. By adding electrodes on both sides of the silicon chip, we can measure the current generated by the solar cell.