Crystalline silicon photovoltaic cells are driven industrial development projects – solar, crystalline silicon cells – silk screen printing industry, especially web
Still be deduced in Wuxi deified solar wealth, the benefit from solar energy industry's long-term positive, in recent years, our company has a large number of new projects crystalline silicon solar cell, so that annual production capacity of 3200 MW fast break, became the world's largest photovoltaic industry base. Photovoltaic power generation in the industry chain, the cells are undoubtedly the most technical characteristics, the most development potential and the most leading role of the central link. The development of crystalline silicon solar cell project, you can drive polysilicon material, pull rod sections, battery components, power generation projects, applications and photovoltaic industry, PV machinery and other related industries.
A polysilicon material The price of polysilicon from 2004 to the present 24 dollars per kilogram of 480 dollars, just four years, prices increased by 10 times, and there is no market price, demand, development has become an industry chain bottlenecks. The main reason for this situation is to extract a larger polysilicon material investment (investment in new polysilicon plants are required to 100 U.S. dollars / kg), more energy consumption (per 1 kilogram of polysilicon materials need to consume 200-500 degrees) and more high threshold. At present the international production of high purity polysilicon production process more than 85% using modified Siemens process. It is the use of chlorine and hydrogen synthesis of HCl, HCl and industrial silicon powder in a certain temperature synthesis SiHCl3, then SiHCl3 separation distillation, the purified hydrogen reduction furnace SiHCl3 in chemical vapor deposition reaction of high-purity polysilicon material . This high-purity polysilicon material require a higher purity, it generally takes up to 9
9.9999% or more. In a seller's market and driven by high profits in recent years, China's LDK, Luoyang Silicon, Sichuan Emei and the silicon industry, companies such as Sunbeam inroads into polysilicon material industry, the estimated total investment of 400 million can be formed after all the years produced 70,000 tons of production capacity. As technology advances, battery slice of silicon used per watt from 05 to 12g / W decrease of 5% annually, beginning in 2010 will reach 9.3g / W, the industry's goal is to reduce the amount of silicon to 6g / W. Coupled with the rapid development of thin film battery, will further ease the supply of polycrystalline silicon material situation.
2, Rod slice of China Solar Energy Industry Alliance Network
Need polysilicon or polycrystalline silicon rods into ingots before it can be further processed into wafers, cells and modules. Silicon rod production process is the most common direct Rafah. In this process, the polysilicon material into the quartz crucible, after the heat and slowly melt, immersed in a certain crystal to the seed, after necking, put shoulder, shoulder turn, and so on track, ending the growth and cooling process completion of a single crystal growth process. More Jingjing ingot production process is most commonly used method ingot. In this process, the polysilicon into the quartz crucible, after the heating, melting, crystal growth, annealing and cooling, to complete a multi Jingjing ingot growth process. Or polycrystalline silicon rods to anchor cut into wafers, is now basically multi-line cutting. Bars or ingots of silicon by surface shaping, orientation, cutting, grinding, corrosion, polishing, cleaning and other processes, processed into wafers that meet specific requirements. The thickness of silicon has been the mainstream in 2004 to the present development of the thickness of 270um 200um based. At present, the international part of the factory production of the silicon thickness can reach 180um. Two years of development experience, the utilization of silicon has increased by 32% or more. As crystal crystal pulling furnace and casting furnace cheaper, and has basically realized the localization, coupled with relatively low technical threshold, therefore, in recent years on a large number of our new projects Rod slice. However, the constraints polysilicon bottleneck factor, which causes the silicon rods, silicon ingots and silicon business into the embarrassing situation.
3, crystalline silicon cells Rod slice of the next link is the production of solar cells, crystalline silicon solar cell into the battery cells and thin film coating two categories. Crystalline silicon cells accounted for 93% of the market, in which the highest conversion efficiency of silicon cells, the domestic has reached 17.6%. Conversion rate of polycrystalline silicon cells exceeded 16%. Crystalline silicon solar cell manufacturing need to go through many processes, including wafer cleaning and surface system down, spread the system end to phosphorus silicon glass, plasma etching, antireflection coating film and screen printing.
The European market, especially Germany, the market demand-pull, leading to domestic enterprises in recent years, massive investment in this area. At present, China solar cell products in 60 enterprises, productivity breakthrough 3200 MW, the total size of the battery chip sets. So far, a total of PV industry in China Suntech, Trina Solar, Hebei JA, Tianwei Yingli, Nanjing electricity, Jiang Xisai Wei, Lin Yang Yu-hui and Zhejiang new energy such as 10 companies have listed overseas, IPO financing totaling more than 1.9 billion, the total market capitalization of 17.865 billion U.S. dollars, the average price-earnings ratio is 49.47 for each company. Traditional centralized power generation, power supply is different is that solar cells with portable, discrete features, easier, more suitable for embedded consumer devices, which the application for the solar cells provide a broad market space. Although the cells are more than 30% annual growth rate, and the current price steadily, as domestic and foreign investment destination, international team problems, high investment and the supply of polysilicon, are investors that have careful consideration.
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