Which polysilicon and monocrystalline silicon strong? This is the field of solar energy component indisputable technology, has a direct impact on the industry trends, industry has recently become a hot topic. In the past few years, the polysilicon product by means of cost advantages, the development of the domestic photovoltaic applications into the mainstream market. But there are indications that monocrystalline silicon products is pregnant with a very strong explosive.
Election chaos under the polysilicon industry
High conversion efficiency is the only way out of the solar industry, if not the efficiency of the post, industry will have no future. Low solar energy density, light energy is very high collection costs, the cost of solar power plants in the glass, frame, back, aluminum frame and other very large proportion of these traditional materials, and in the course of hundreds of years of development, the cost of these materials fall the range is limited, so the proportion of solar energy in the energy sector in order to improve, we must improve the conversion efficiency and reduce collection costs. Only conversion rate, power output increased to reflect the economics of photovoltaic power generation.
Technically speaking, silicon single crystal structure of the components due to its high material purity, low resistance, high photoelectric conversion efficiency, the operating temperature lower than silicon components. Therefore, under the same conditions, the higher the power of the same nominal power output of monocrystalline silicon component, and the decay rate of the single crystal silicon is less than the product of polysilicon, its higher stability.
Earlier, a large-scale photovoltaic power plant quality survey organized by the China Financial Leasing Co., show that about 30 percent over three years to build power plants in varying degrees of quality problems, and even built three years but PV power plant components decay rates as high as 68%.
But why is the mainstream of the market polysilicon? One impetus terminal lack of monocrystalline silicon market, resulting in the industry's lack of understanding, speaking monocrystalline polycrystalline construction costs than the more expensive per W from the appearance, but the actual per W, Judging generation monocrystalline not expensive. . Second, because most domestic battery manufacturers have a polycrystalline ingot production capacity, for pulling his chain, active sales of polysilicon products, channels and wider. Third Monocrystalline technical requirements, long production cycle, only a handful of companies have inventories, such as the occurrence grab installed by the end, it is difficult to form an effective supply of monocrystalline silicon products. .
This is China's new energy market development, especially the development of the PV market chaos, the threshold is low, the quality standards are not clear. Part of the power plant builders do not want to really hold power station, so driven by the interests, reduce costs choose low-quality components, which also appeared in some of the low-quality plants.
Monocrystalline expected future cost reduction 40%
Monocrystalline and polycrystalline silicon which is expensive? A power plant investment sources, investment watt power plant to see the system indicators, that is, after completing construction of the entire power plant system, in terms of cost per watt is how much money. So now integrated to build a ground station to count all costs, polycrystalline or monocrystalline lower than that, and this is the main reason they chose polycrystalline.
In fact, with the continuous improvement of monocrystalline silicon technology, we are using diamond wire cutting and continuous feeding Czochralski method, the cost difference between the single crystal silicon and polycrystalline silicon sheet is shrinking, combined with efficient monocrystalline silicon component also can significantly reduce BOS cost of the system, which will save the total cost of system installation. The decline in the cost of polysilicon manufacturing space is relatively limited.
From a global perspective, high efficiency solar module products become mainstream. March 21 this year, the product of many years of production of polycrystalline Kyocera announced the new monocrystalline module products in response to market demand for high conversion efficiency of the product; this year June 17, Tesla's another head Maske star Enterprise Sun City (Solarcity) announced the acquisition of a single crystal component manufacturers Cylons electricity, and plans the next two years in New York annual production capacity of more than 1GW of module production capacity. In addition, the N-type monocrystalline global enterprises Sunpower also introduced this year expansion plan, annual production capacity expected to 2015,2016 upgrade from the current 1.2GW to 1.4GW, 1.8GW; MissionSolar crystal battery manufacturers and the world's largest supplier of silicon wafers GCL also announced expansion plans crystal products.
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