PS: The technical content is really difficult to write, and I don't want to write about the space pan, so it took at least six or seven hours to write this chapter, and please forgive me, thank you!

"I know some silane method, according to the different silane preparation methods, there are three types, namely silicon-magnesium alloy process, metal hydride process and chlorosilane disproportionation process, although the silicon-magnesium alloy method is the most studied process line in history, but it has been eliminated a few years ago.

Although the other two processes are considered by the industry to have great development prospects, they are not yet mature, and as for the metallurgical method you mentioned, so far I have not heard of such a process technology......"

For Yao Fei's words, Konecranes said that he did not believe it very much, aside from the improved Siemens method, the most advanced process technology for the preparation of high-purity polysilicon must be the United States, and he is clear about the situation in the polysilicon industry.

"It doesn't matter if you haven't heard of it, the professor just needs to know that since I can name these process methods, then there must be a complete theoretical basis, and for the research cycle in the laboratory, of course, we also hope that the shorter the better!"

The reason why Yao Fei wants to find such a professional expert is not because he values the professional ability of others, and he can come up with research results in the shortest possible time according to the theory he provides.

"Then let's talk about the metal hydride process and the chlorosilane disproportionation process first......

The situation of Kony and Brady is different, the former accepted Yao Fei's invitation with the intention of coming up with results as soon as possible, while looking at Professor Kony, he does not look like a person who wants to prove himself. I was invited to meet Yao Fei today, and it was more about seeing what benefits I could get from Yao Fei. Even if they are familiar, they are not the same as Harvard and MIT. Most of their academic research funding comes from Washington, D.C., and most of them come from local businesses.

But he will not cooperate with other companies at will, even if the names of Yao Fei and Feiyue Technology Company are already well-known in the land of Silicon Valley, but in the unfamiliar field of other companies, from his personal fundamental interests, it is very necessary for him to understand the feasibility of other people's technologies before the two sides negotiate.

"Professor Kony, please sign this non-disclosure agreement before we start the substantive exchanges, because what I'm going to say next can have a lot going to affect the landscape of the global polysilicon industry. So please forgive me for being cautious! ”

You have your plan, I have my ladder to cross the wall, without determining the other party's intentions, the best way is to ask the other party to sign a confidentiality agreement, so that even if the other party temporarily repents, it will not have much impact.

As for patent protection, how can there be any patents, Yao Fei is still waiting for others to take out the test results and then apply for them, and the purely theoretical things will be taken to the patent office. The staff will not bird you, and even look at you unpleasantly, and punish you for malicious registration.

"Alright, please take it. Please tell me, I'm looking forward to it even more......"

The content of the confidentiality agreement is very simple, which requires Takoni to keep the metal hydride process and chlorosilane disproportionation process described by Yao Fei confidential. No third party may be told without the permission of the other party.

"No problem. Let's start with the metal hydride method, the popular technology is to use metal compounds, silica fume and hydrogen chloride as raw materials to produce trichlorosilane first. Then react with hydrogen to produce polysilicon, although this method has the advantages of continuous production and large output, but the side effects are also very obvious, the hydrogen chloride and silicon tetrachloride produced are not only difficult to treat, but also harmful to the environment.

The metal hydride method I am talking about uses metal compounds to react with silicon tetrafluoride gas to synthesize silane gas, and the crude silane gas produced by the reaction is purified and refined by adsorption tower, deweighting tower and delighting tower, and the purity of crude silane gas is improved to high-purity electronic grade silane gas of more than 6N, and then the liquid silane prepared by low-temperature liquefaction treatment is stored in the product silane storage tank, and the liquid silane gas is transformed into silane gas at room temperature by evaporation of liquid silane gas for silane reduction into polysilicon.

This technology not only has the advantage of continuous production and large output, but also has no impact on the environment as a product of only hydrogen, and the polysilicon produced using this method will bring us more surprises.

As for the disproportionation process, we can also call it the carbonaceous reduction method, this method is the use of chlorosilane synthesis and disproportionation to finally obtain silane, due to the slightly complex reaction steps, the international is only in the experimental exploration stage, but this method also has the ability of large-scale mass production, and due to low energy consumption, high material utilization, less by-product discharge, simple processing, the same will have a large enough impact in the industry......"

The actual operation Yao Fei has never operated at all, even if it is experimental, but who said that he has innate knowledge and experience of several decades more than others!

At this time, looking at Professor Kony opposite, the look on his face now is completely ghostly, the same expression as when Yao Fei explained the preparation method of monocrystalline silicon to Brady at the beginning.

"Professor Coney, can we talk about cooperation next?"

Seeing that the other party did not react for a long time, Yao Fei had no choice but to interrupt the other party's contemplation.

"Yes, absolutely!"

Kony, who reacted, hurriedly replied in the affirmative to hide his embarrassment.

"Then I wish us a happy cooperation, I wonder what kind of cooperation the professor plans to use to cooperate with our company?"

Since the other party expressed his willingness to cooperate, then Yao Fei must strike while the iron is hot and finalize the cooperation agreement between the two sides as soon as possible.

"Please give me some time, I need to think about it carefully......"

Of the three methods, the first is the safest, which can have a solid income, but because it is too risk-free, the return must also be the lowest.

And the second way, it is equivalent to signing a deed of sale with others in the early stage, and the research and development results are his ransom, although there are risks, but according to the performance of the other party, the risk is not very large, and it is a matter of time before you have your own laboratory, but this cycle should be very long, not ten or eight years, I am afraid it is not over.

As for the last method, go to Chinese mainland to work, with an annual salary of 300,000 US dollars, although it seems that the cumulative salary is much the same as the second one, or even worse.

But it's flexible, not only in terms of salary, but also in terms of working hours, and it's worth mentioning that there is no risk either.

The three collaborations, each with its own advantages and disadvantages, made it impossible for Konecranes to choose for a while...... (To be continued......)