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In the world photovoltaic industry, the use of polycrystalline silicon ingots to produce monocrystalline silicon has been called “impossible task†by the industry. This method was once sentenced to death by the industry. The Donghai Jingao Group, led by Dr. Huang Xinming, a key technical figure, broke through this precept after two years of research and development.
On March 19th, the “Super Crystal Grain Quasi-Single Crystal Ingot†technology independently developed by Donghai Jingao Solar Energy Technology Co., Ltd. passed the appraisal of a domestic expert group organized by the Science and Technology Bureau of Lianyungang City, Jiangsu Province. Big shock. The breakthrough in this technology has led to a substantial drop in the cost of polycrystalline silicon ingots, which will have a major impact on the existing crystalline silicon market structure.
From the analysis of various indicators, this technology has taken at least 2-3 years internationally.
Quasi-single-crystal silicon sets all advantages
As we all know, compared with polysilicon, monocrystalline silicon, its conversion rate has always been the equivalent of polysilicon; and polysilicon feeding a 450 kilograms of ingot size also allows a furnace only 100 kilograms of Czochralski crystal unmatched. Therefore, since the development of the photovoltaic industry, monocrystalline silicon and polysilicon have been equally divided in market share, and they have always maintained a coexistence trend.
However, this situation will soon be broken by the "Super Large Grain Quasi-Single Crystal Ingot" technology developed by Dr. Huangxin Huang.
According to Dr. Huang Xinming of Donghai Jingao, under normal circumstances, the process cost of CZD single crystal is generally about 160 yuan per kilogram, and the process cost of polysilicon ingot is about 60-65 yuan per kilogram. In comparison, the Czochralski conversion rate can reach 18.5%, polycrystalline silicon is generally about 14% to 17%, and the highest conversion rate of quasi-monocrystalline silicon products produced using the new ingot technology can be comparable to that of monocrystalline silicon, as high as 18.2. %-18.3% or so.
Dr. Huang Xinming introduced that the reason why the product produced by this technology was named “quasi-single crystal silicon†is because the characteristics of the silicon wafer produced by the polycrystalline ingot process are almost similar to those of monocrystalline silicon. Although the highest photoelectric conversion rate is slightly inferior to that of Czochralski, it has obvious advantages in terms of attenuation rate. The current best Czochralski single crystals generally have a decay rate of more than 2%, but the quasi-monocrystalline silicon module attenuation rate remains below 0.5%. "From this point of view, quasi-monocrystalline silicon products have greater advantages than monocrystalline silicon."
"This technology utilizes the technology of polysilicon ingots to obtain a single crystal quality product. At the same time, it compensates for the low conversion efficiency of polycrystalline silicon wafers and the small yield of single crystals. It is equivalent to the cost of 160 yuan made with the cost of 60 yuan. Products.†Huang Xinming added.
Quasi-single silicon heavy sub-market structure
At present, the market share of the photovoltaic market is 10%, and 90% of the market is crystalline silicon. The crystalline silicon market is subdivided into monocrystalline silicon and polysilicon. Relevant data show that the market share of monocrystalline silicon and polysilicon is between 30%-40% and 50%-60% respectively.
From quasi-monocrystalline silicon and ordinary polysilicon cost analysis can also be seen, quasi-monocrystalline silicon has the advantage of replacing the ordinary polysilicon products, the market structure will be re-classified quasi-single crystal ingot project products will occupy a certain market share. It can be predicted that with the mass production of “Jingfeng†products, the photovoltaic market structure is expected to undergo major changes in 1-2 years.
Dr. Huang Xinming said: “Compared with polysilicon ingots, the single-crystal ingot technology will increase 0.3-0.4 megawatts per year in the production capacity of each ingot furnace, and will increase the investment in seed crystal costs. This technology will bring about every furnace. With an increase in revenue of about 300 million to 4 million yuan, according to market trends, not only increasing the amount of charged materials has become an option to reduce costs, but also there is room for optimization in the long crystal and battery technologies, which can further increase efficiency and increase product competitiveness. The impact of market share will be the most serious."
“But the new technology has limited impact on Czochralski's market share. Czochralski's single crystal will reduce some market share, but there is still room for demand. This is mainly because the product has not yet reached the single crystal conversion rate due to the different positioning of customers. Monocrystalline silicon market share will remain," said Dr. Huang Xinming.
Mass production speeds up PV access to the Internet
As a component produced by a quasi-single crystal ingot furnace production process, a crystal pattern resembling a maple leaf appears, and this product is formally named "crystal maple" by Jingao. As a new technology, 'Jingfeng' product quality is very stable, and it is expected to achieve mass production after obtaining certification from all parties in June this year. At present, only one company, Jingao, can mass-produce in the world.
Currently, there are already 12 quasi-single crystal ingot casting furnaces in the Jinghai Group, Donghai. With the follow-up of the second phase of the project, the company will introduce 33 quasi-monocrystalline silicon ingot casting furnaces. The production capacity is expected to reach 200 by the end of the year. 300 MW. According to report, the cost of 'Crystal Maple' has increased by 0.3 yuan to 0.4 yuan compared to polysilicon ingots, but the conversion rate has increased by 0.5% to 1% compared to ordinary cast polysilicon, reaching 17.5% to 18%, and the total battery power of single spindles. High 2000-3000 watts, the profit made of solar cells can be increased to 3-4 yuan / piece, so that components can increase 4-5 yuan / piece, a considerable profit, can effectively reduce the entire photovoltaic production costs.
"Now this kind of low-cost, high-conversion product is highly sought after by the market. There are already many customers who are interested in signing orders with the company," said Dr. Huang Xinming.
As we all know, China's photovoltaic flat-rate Internet access has always been implemented, and its production cost is the bottleneck restricting the parity of the PV. Many experts also stated that it is only possible to achieve parity online access if costs continue to decrease. From the national PV route development map, it can be seen that the intersection point of traditional energy price and PV grid cost node with traditional energy is around 2015, that is to say, in the current situation, China can achieve parity internet access in 2015.
Dr. Huang Xinming said: "With the breakthrough of the "quasi-monocrystalline silicon ingot ingot method" and the mass production of the products, we will effectively promote the promotion of photovoltaics at the same price."
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