Solar street light is a solar cell made by the principle of photovoltaic effect. During the day, the solar panel receives solar radiation energy and converts it into electrical energy for output. The photovoltaic effect refers to the phenomenon that semiconductors generate electromotive force when they are illuminated by light.

The photovoltaic effect is referred to as the photovoltaic effect, and the wind-solar complementary controller refers to the phenomenon that the light produces a potential difference between the different parts of the uneven semiconductor or the combination of the semiconductor and the metal. It is firstly the process of converting photons (light waves) into electrons and light energy into electrical energy; secondly, it is the process of forming voltage. With voltage, it is like building a dam. If the two are connected, a current loop will be formed.

If light strikes a solar cell and the light is absorbed at the interface layer, photons with sufficient energy can excite electrons from covalent bonds in both P-type and N-type silicon, resulting in electron-hole pairs. The electrons and holes near the interface layer will be separated from each other by the electric field effect of space charges before recombination. Electrons move toward the positively charged N region and holes toward the negatively charged P region. Charge separation through the interface layer will generate an outwardly measurable voltage between the P and N regions. At this time, electrodes can be added to both sides of the silicon wafer and connected to a voltmeter. For crystalline silicon solar cells, the typical value of the open circuit voltage is 0.5 to 0.6V. The more electron-hole pairs generated by light on the interface layer, the greater the current flow. The more light energy absorbed by the interface layer, the larger the interface layer, ie the cell area, and the greater the current formed in the solar cell.

Solar energy is the cleanest, safest and most reliable energy source in the future. Developed countries are taking the development and utilization of solar energy as a long-term plan for the main content of the energy revolution.