Classification of photovoltaic glass
First of all, photovoltaic cells can be divided into crystalline silicon cells and thin-film cells. Because of their high photoelectric conversion efficiency and relatively mature technology, crystalline silicon cells are currently the mainstream of the market, with a market share of about 90 percent . At present, the manufacturing process of photovoltaic glass used in crystalline silicon cells mainly adopts the calendering method, and the manufacturing process of photovoltaic glass used in thin-film cells mainly adopts the float method, and the manufacturing processes of the two are different. Compared with ultra-white float glass, the surface of ultra-white rolled glass is calendered by a machine, and the glass surface can produce a pattern with a tapered pattern, which can reduce the reflectivity and absorption rate of the sun's rays, and make the sun's rays under various angles. The injection has a very high light transmittance, which greatly improves the photoelectric and light-to-heat conversion efficiency of the photovoltaic module.
Photovoltaic glass, like ordinary glass, is also made of raw materials such as quartz sand, soda ash, dolomite, and limestone. However, the iron content of photovoltaic glass is different compared with ordinary glass. The difference in iron content determines the difference in the light transmittance of the glass. The iron content of photovoltaic glass is about {{0}}.05 percent to 0.02 percent , and the light transmittance is generally about 91.5 percent . , Greater than or equal to 91 percent in the 300-2500nm spectral range. The iron content of ordinary glass is more than 0.2 percent , and the light transmittance is between 88 percent -89 percent . Therefore, the manufacture of photovoltaic glass requires the use of quartz sand with a lower iron content. At the same time, the use environment of photovoltaic glass is relatively harsh, so photovoltaic glass needs to have better high temperature resistance, a certain degree of corrosion resistance to outdoor acid rain environment, etc., and its impact resistance is stronger than ordinary glass. The manufacturing of photovoltaic glass has higher requirements for the manufacturing process of glass factories, and it is difficult for ordinary glass factories to convert into photovoltaic glass factories.
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