Brady flipped through the note in his hand and looked at it over and over again, his whole face twitching as if he wanted to know if God was playing an international joke on him.

After accepting the congratulations from all parties, Kobayashi Hongzhi, who had reacted, thought of meeting and saying hello to the core people of the research institute who was about to start, and expressing his friendliness to him, but how could he still find someone when he looked around......

Today's night is destined to be a sleepless night for some people, Kobayashi Hiroshi, Ibuka Dai, and Odanakamura Jiro return to the hotel to continue the celebration, but Brady is forced to sleep in bed tossing and turning, unable to sleep, even with his wife Elena can not sleep as usual.

The next morning, after a hurried wash, Brady couldn't sit down to have breakfast with his wife, grabbed only two pieces of bread on the dining table, drank a glass of milk, and rushed to Yao Fei's hotel room with his panda eyes.

Every expert and professor who has a persistent pursuit of scientific research has the same fatal weakness, that is, the resistance to any high-end technology is almost zero.

At that time, Yao Fei also thought of this reason, plus grasped Brady's urgent need to prove his idea to the scientific community, and gave Yao Fei the idea of luring Brady to leave the institute to work for himself, and the next thing was simple, the magnetron straight-pull technique of monocrystalline silicon, the continuous growth technique and even the suspension area melting method, Yao Fei has everything here.

Yao Fei, who was sorting out the information written last night, heard a knock on the door and opened the door, and saw Professor Brady standing outside the door with a pair of big panda eyes, and knew that the matter had basically been done, as long as the hoe dance was good, how could there be a corner that could not be dug down, it was really a golden and jade good word!

"Professor Brady, good morning, introduce yourself, I'm Yao Fei, please come in!"

Just waiting for you, since you're here, of course, there's no reason for people to talk outside the door, and it's not convenient to be rude and not to say it.

"Thank you."

Brady didn't say anything, thanked him and followed him into the room.

"Mr. Yao, you said that you have mastered various methods for the manufacture of monocrystalline silicon, including magnetron straight-pull technology, continuous growth technology and zone melting method, is this really the case?"

As soon as he sat down, Brady immediately asked Yao Fei eagerly.

"Yes, Professor, I know the principles of these techniques, and these techniques have been experimentally demonstrated by me, and they are only waiting to be further used in the production of practice......

When a big fish is hooked, people who like fishing know that if you bite the hook, don't immediately carry the rod, so that the fishing line is easy to be broken by the big fish.

At this time, it is necessary to put a long line and let it continue to rush around in the water until the fish is exhausted, and it can naturally be dragged ashore very easily.

Yao Fei's previous idea was to use the technique to ** him first, disturb his mind, and then let him struggle psychologically for a while, and then wait until the other party came to find him, and then throw his olive branch to the other party, as for whether the other party can take the bait, it depends on the other party's dedication to the technique, and with what Yao Fei saw and heard yesterday, it is unlikely that the other party will not take the bait.

"Mr. Yao, can you ask you about the monocrystalline silicon technology, why the purity of the monocrystalline silicon produced by our research institute can reach 98.97%, but it still does not reach the standard purity of 99.9% in the market?"

Brady is obviously a doer, and when he heard Yao Fei say that he had skills, he immediately asked about it.

"I don't know what kind of growth technique Professor Lu Dao used before, and some operations in the growth of monocrystalline silicon rods, can you give me a detailed introduction?"

"No problem, I used the Straight Pull Growth Technique before.

The polysilicon contained in the quartz crucible is melted by strong resistance heating, and the temperature is slightly higher than the melting point of the silicon, and then the seed crystal is immersed in the melt, and then the seed crystal is pulled to the top at a certain speed and rotated at the same time to draw out the crystal;

Then control the extension of the crystal, and control it to the required diameter, up and down the forward and negative direction of rotation and pulling, control the crystal equal diameter growth to the required length, the most coarse and then finish, and then take out the crystal when it cools. ”

Brady gave a detailed introduction to his process of manufacturing monocrystalline silicon, which is basically based on the previous manufacturing process of Zhizopull monocrystalline silicon, which is also a common manufacturing method in the monocrystalline silicon industry at present.

"I know that the method just described by the professor is basically not a big problem, but there are a few small problems that I don't know if Professor Lu Dao has taken into account in the actual production operation.

First, when the straight-pull method is used, the melt height is the highest in the crystallization stage, and the height of the bare crucible wall is the smallest, during the crystal growth process until the closing stage.

In this process, the height of the exposed crucible wall continues to increase, which causes the growth conditions to change continuously, including the convection of the melt, heat transport, solid-liquid interface shape, etc., that is, the whole crystal rod undergoes different heating conditions from beginning to end, the head is heated for the longest time, and the tail is the shortest, which will definitely cause the uneven distribution of impurities in the axial and radial directions of the crystal.

At the same time, in the Straight-pull method, the oxygen content and its distribution are very important, but the oxygen content is a parameter that is difficult to control, which is mainly due to the thermal convection in the melt that aggravates the effect of the molten silicon and quartz crucible, that is, the impurities such as O2, B, Al and other impurities in the crucible are easy to enter the melt and crystal, and the maximum impurity content of the single crystal silicon rod is too high. ”

For Yao Fei, there is nothing to hide about the problems that arise, and the technology to solve the problem is the key, and then he gave Brady a general introduction to the problems that are easy to occur in the traditional monocrystalline silicon straight-pull production technology.

"Then Mr. Yao's magnetron straight-pull technique is an improvement in this regard?"

Brady didn't have the usual all-powerful and all-knowing professor's temperament at this time, he was completely an ignorant elementary school student, waiting for Yao Fei's answer with an expectant expression.

"Yes, the magnetron Straight Pull Technique is an improvement on the traditional Straight Pull Technique, which reduces the temperature waveness in the melt.

At present, the temperature fluctuation in the melt near the solid-liquid interface can reach more than 10 C in the Zzopull method, and if a magnetic field of 0.2 T is applied, this temperature fluctuation will be less than 1 °C.

In this way, the uniformity of the distribution of impurities in the crystal can be significantly improved, and the uniformity of the radial resistance distribution of the crystal can also be improved.

In this way, the defect density in the single crystal can be reduced, the ingress of impurities can be reduced, and the purity of the crystal can be improved.

This is due to the fact that the effect of molten silicon with the crucible is weakened under the action of the magnetic field, so that less impurities in the crucible enter the melt and crystals.

The combination of magnetic field strength and process parameters such as crystal rotation and crucible rotation can effectively control the change of oxygen concentration in the crystal. Due to the magnetic viscosity, the thickness of the diffusion layer increases, which can improve the longitudinal distribution uniformity of impurities. It is beneficial to increase productivity.

The use of magnetron straight-pull technology, such as the use of horizontal magnetic field, when the growth rate is twice that of the general straight-pull method, can still obtain high-quality crystals, which is simply a blessing for large-scale mass production. ”

Yao Fei did not hide his personal knowledge about this magnetron straight-pull technique, and told Brady about the improvement method and some improvement parameters......

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