The most important thing for solar street lighting is stability and absorption

　　 Solar energy is one of the most important new energy development topics in the 21st century. Solar energy, wind energy and tidal energy are called the 'three green energy sources' in the 21st century.　　The advantages of solar resources are powerful energy, high stability, and easy to use, but the shortcomings are also obvious: it is affected by the climate, and light scattering, and the utilization rate is relatively low. At present, light bodies that use solar energy have gradually developed, and are very stable and have strong light absorption. They can fully absorb the light energy per unit area and then convert it into other energy sources for use. Among them, solar panels use solar energy to generate electricity. high.　　The highest photoelectric conversion efficiency of monocrystalline silicon solar energy reaches 24%, which is the highest photoelectric conversion efficiency of all types of solar cells at present. However, the production cost of monocrystalline silicon solar cells is so great that it has not been widely and widely used. In terms of production cost, polycrystalline silicon solar cells are cheaper than monocrystalline silicon solar cells, but the photoelectric conversion efficiency of polycrystalline silicon solar cells is much lower. In addition, the service life of polycrystalline silicon solar cells is also shorter than that of monocrystalline silicon solar cells. . Therefore, in terms of cost performance, monocrystalline silicon solar cells are slightly better.　　In the past ten years, researchers have discovered that some compound semiconductor materials are suitable for solar photovoltaic conversion films. Thin films made of semiconductors improve the photoelectric conversion efficiency of solar cells. Multi-element semiconductor materials with a gradient band gap (the energy level difference between the conduction band and the valence band) can expand the range of solar energy absorption and improve the photoelectric conversion efficiency.　　 The development of solar street lights to this day, although there has been no breakthrough in technology, but now it has also improved the most important stability and absorption. It takes about ten hours to fully charge the solar street light in three hours to provide lighting effects.