A new upsurge of energy, the solar energy industry become sweeping the globe. Thus, the debate around photovoltaic industry unending, pv downstream industry none of the debate. Photovoltaic industry downstream components vendors were choose crystalline silicon thin film or the discussion of judah, and in the ear sound photovoltaic industry or by metallurgy upstream on improvement of Siemens method in unprecedented manufacturing polysilicon hot debate.

Recently, the newspaper is now process route selection problems of international polysilicon interviewed professor at tsinghua university MouJiaoShou, this proposed method of physical metallurgy is more suitable for the production of solar cells, said six 9 purity of polycrystalline silicon solar cell production can meet requirements (6 to 9 the purity of polysilicon 99.9999% nicht verlangert, and points out that the production of solar energy, metallurgy method is the best way. Polysilicon

But China’s electronic material industry association, the secretary-general of semiconductor material in an interview ZhuLiHui professor also put forward their own views. Prof zhu said: “the improved method is highly efficient and stable production of Siemens with polycrystalline silicon solar battery main ways.” Prof zhu said, in the last century 70’s, 50 – for international polysilicon purification early controversial: from the performance to price, silicon by chemical purity, number of structural integrity and electrical properties uniformity on physics.

According to the reporter, the purity of polysilicon preparation methods mainly adopts is improved and a new method of Siemens silane two chemical methods. Among them, improvement of Siemens method in global share 80%, silane method of nearly 20%, but use method of metallurgical purification polysilicon market share is negligible.

Prof zhu said in solving the integrity of the silicon crystals and uniformity of physics method can rely on, but in the process of improving the purity of polysilicon, such as purity to 7 or 8-12 September 9, mainly depends on chemical method.

“So far, any country made of high purity polysilicon depend on improvement of Siemens method and a new method of silane.” Prof zhu said, “physical technology has failed to break through physical method, if forced the polysilicon do high purity, boron content (p < 0.1 PPma, metal impurity content should lower the cost) will cost more than chemical method."

Prof zhu said: "my ideas very clearly, purity, reach 7 September polysilicon production of solar cells are not, if want to use this June 9 purity silicon solar battery, will not only make the photoelectric conversion efficiency causing battery, low attenuation, and will cause battery life is short. So I don't agree with six 9 below polysilicon production batteries. Now there is a kind of industry, due to the improvement of Siemens polysilicon, not suitable for high purity rank, because the sun energy to doping, may, with high purity of low purity of polysilicon as polysilicon mixed reduce costs. This is irresponsible, unscientific. As with two of the nine industrial silicon into 10 of high purity silicon in September, according to the proportion of 9 May melt, mixed silicone purity not (2 + 10) / 2, but is still 2 September 9 silicone."

Prof zhu said: "now, metallurgical method is still not worldwide breakthrough 6 September. The method of metallurgical hot now propaganda are low cost, but also because of metallurgical kilowatt components, the method of conversion efficiency low silicon, the quality is reliable, the number of components, need more final cost is higher." Professor zhu explanation, metallurgical technique in the world without a breakthrough, through the method of metallurgical silicon solar battery, first is made low, photoelectric conversion rate in 12-13, and high purity of polysilicon battery 17% – 19% difference of photoelectric conversion. Secondly, the method of metallurgical polysilicon battery components attenuated fast, 3-5 years will appear serious attenuation, and now the world solar battery life requires at least 25 years to 30 years.

"Reduces the cost and improve the efficiency of solar cells are two eternal topic, physical, metallurgical for solar battery grade polysilicon will still be go15 on no. 6 and now breakthrough about its application in practical force is still too early to tell." Prof zhu said.

The reporter thought, no matter what the market finally chooses what material technology, craft and technology, you will experience the sweep of the market. Crystalline silicon dominance reigns, but film still living space, Metallurgical technique, but failed to break the related enterprise still exist, that both choose crystalline silicon or film, choose metallurgy or improved method of Siemens technology, still have to improve comprehensive utilization and reduce the cost of space. Enterprises to improve the comprehensive utilization and cost reduction, and also an important direction of the future work.

As photovoltaic cell technology constantly update, we have reason to believe, the whole photovoltaic industry in the process of debate will choose out their own way.

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