At present, crystalline silicon materials (including polysilicon and monocrystalline silicon) are the main photovoltaic materials, with a market share of more than 90%, and will still be the mainstream material for solar cells for a long period of time in the future. The production technology of polysilicon materials has long been in the hands of 10 factories of 7 companies in 3 countries such as the United States, Japan and Germany, forming a technological blockade and market monopoly. Demand for polysilicon mainly comes from semiconductors and solar cells. According to different purity requirements, it is divided into electronic level and solar level. Among them, the electronic grade polysilicon accounted for about 55%, solar grade polysilicon accounted for 45%, with the rapid development of photovoltaic industry, the growth rate of solar cell demand for polysilicon is higher than the development of semiconductor polysilicon, it is expected that by 2008, the demand for solar polysilicon will exceed electronic grade polysilicon. In 1994, the total production of solar cells in the world was only 69MW, and in 2004 it was close to 1200MW, a 17-fold increase in just 10 years. Experts predict that the solar photovoltaic industry will surpass nuclear power in the first half of the 21st century to become one of the important basic energy sources.

General life
The service life of solar panels is determined by the material of the battery, tempered glass, EVA, TPT, etc. Generally, the service life of the panels made by the manufacturers of better materials can reach 25 years, but with the impact of the environment, the materials of solar panels will age with time. Under normal circumstances, the power will be attenuated by 30% for 20 years, and the power will be attenuated by 70% for 25 years.