The solar cell is based on the photoelectric effect of semiconductor materials, the energy conversion device. Solar photovoltaic effect: the assumption that the light on the solar cell and light at the interface layer is accepted, the photon with sufficient energy can be aroused from a covalent bond in the electronic P type and N type silicon in silicon, resulting in electronic attack hole pair. The electrons and holes near the interface layer are separated from each other by the electric field of the space charge before they are combined. Electrons move toward positively charged N regions and holes toward negatively charged P regions. Through the charge of the interface layer, an outward, testable voltage is detected between the P region and the N region. At this point, electrodes can be placed on both sides of the wafer and connected to the voltmeter. For crystalline silicon solar cells, the typical values of open circuit voltage are from 0.5 to 0.6V. The more electron hole pairs occur through the light at the interface layer, the greater the current. The more light energy is accepted by the interface layer, the larger the interfacial layer is the cell area, and the greater the current in the solar cell.