Vol 2 Chapter 574: Spell chip manufacturing process

at the same time.
　　 Richard took the sand and entered the Garden of Eden.
　　 walked into the main laboratory, poured the sand into a funnel-shaped container, and then started washing, screening, and filtering. After a lot of processes, the qualified pure sand was finally obtained.
　　 Transfer the pure sand to another cylindrical container, mix a lot of coke, put it in a special furnace and start heating.
　　 During the heating process, the sand made a noise. Richard knew that this is the composition of the sand—silica, which reacts with the composition of the coke—carbon, and eventually produces metallurgical-grade coarse silicon with a roughness of about 98%.
　　After heating, Richard got enough coarse silicon, without hesitation, and quickly started the second step processing. The specific operation is to chlorinate with hydrochloric acid, and then distill to make polycrystalline silicon with high purity step by step. According to the standard, the purity of the produced high-purity polysilicon is 99.999999999%-a total of 11 9s-this is a hard requirement. If it cannot be achieved, the products made afterwards are likely to have certain defects.
　　After completing this step, after passing the test, Richard did not stop, and began to put polysilicon into a special container to melt into a high-temperature liquid under the effect of high temperature.
　　 After successful melting, put a small grain of silicon crystal silicon in the liquid, and use this grain of silicon crystal silicon as the attachment to let the liquid form a little at the bottom. When the silicon crystal silicon seed that is put in and is slowly pulled out, a round bar is formed under the silicon crystal silicon seed. This is a single crystal silicon ingot, also known as a "long crystal". You can see that the long crystal is a standard cylinder with a radius that is consistent with the original silicon crystal silicon.
　　At this point, the negative of the chip has completed the production stage, and the next stage is the processing stage.
　　 Put away the produced monocrystalline silicon ingot, Richard stepped, quickly walked out of the main laboratory, went to the machining sector, and then entered the research room.
　　In the research room, Richard put the single crystal silicon ingot on the processing table, keeping it upright, adjusting the robot arm to move down, and starting accurate cutting.
"brush!"
　　 The manipulator swung over and saw that the monocrystalline silicon ingot was immediately cut off. The cut part happened to be a thin disc with a diameter of more than ten centimeters.
　　Finely polish and polish the wafer, you can see that the surface of the wafer is extremely bright, like a mirror, and it has become a qualified wafer-silicon wafer. This is the most basic raw material in the integrated circuit industry.
　　 After cutting the round crystal to a certain specification, it is the original state of the chip, which is the so-called negative film.
　　 At this point, the film production is complete.
　　……
　　After the production of the negative film, it is the photoresist and developer that need to be resolved.
　　Photoresist is a liquid applied on the negative film. After being irradiated with special light, it will have a special change, and then immersed in the developer to carry out a special reaction to obtain the pattern on the mask.
　　 Generally speaking, there are two main types of photoresist-positive photoresist, and negative photoresist.
　　 Positive photoresist is a photochemical reaction that occurs in the exposed part and dissolves in the developing solution. The unexposed part is insoluble in the developing solution and remains on the substrate. The final pattern formed on the substrate is the same as the pattern on the mask.
　　Negative photoresist is the insolated part that is insoluble in the developer because of crosslinking and curing, and the unexposed part is soluble in the developer. The final pattern formed on the substrate is exactly the opposite of the mask.
　　After some consideration, Richard decided to use positive photoresist, so it would be easier to make a mask later.
　　Just like that, Richard started the configuration of chemical reagents.
After 　　, he was busy for several days, constantly going in and out of the three-story wooden building, and the monitored Maas continued to report the observation to the wizard Wanan.
　　……
　　 A few days later.
　　 In the second floor wooden building.
After listening to Ma’s report again, Wan An frowned deeply, very puzzled: "Before, he searched for the blood of demonized creatures, the juice of the plants, and he could barely understand, but today he is looking for what it is called' What does Montaukite's ore want to do?"
Because Mas stayed outside for a long time, he was hungry and groaned, standing in the corner while stuffing dried fish, pumpkin pie and other things into his mouth, and shaking his head in response: "I don’t know the teacher either, oh, oh, anyway From the beginning, I thought the guy was weird and completely unclear what to do, huh huh..."
Wanan couldn't help but feel bad, and he was bored when he heard Ma's mouth eating. He turned his head suddenly and looked at Ma, ordering: "Don't stay here, you go out and keep staring. , Must not let go of any of his actions."
　　 "But..." Mas hesitated a moment, "Teacher, can I go before I finish eating, I haven't eaten anything for a few days."
　　 "Huh?!" Wanan raised his eyebrows and his expression became a little dangerous.
　　 "I!" Mas grumbled, swallowing the food, and dared not talk nonsense, kicking things like dried fish and pumpkin pie into his arms, crawling and crawling out of the door, quite awkwardly.
　　 ran out of the door, and Maas took a pumpkin pie into his mouth, biting it fiercely, and it looked a little grim, but after swallowing the pumpkin pie with a gurgle, it returned to normal. Looking at the wooden building behind him, he breathed a sigh of relief and UU Reading www.uukannshu.com walked towards the corner of the gathering place.
　　……
　　 Inside the Garden of Eden.
　　Main laboratory.
The two liquids of photoresist and developer were mixed in the container. Li Cha carefully observed the reaction and nodded with satisfaction: "It seems that both liquids can play a corresponding role. Then, except for the light source, there is only Mongolia left. The board needs to be solved. However, the mask is a big job."
　　 Well, great work.
The function of the mask is to block the light from the light source and let specific light shine on the photoresist coated negative film to produce a specific shape.
The shape on the mask is the shape on the chip.
　　 Therefore, it is necessary to engrave all the magic patterns in the design drawing of "gloomy gloves" on the mask.
　　 "Cracking!"
　　Richard moved his body, made a series of bone sounds, then walked out of the door and walked to the machining sector.
　　Laboratory of machining sector, Li Cha found the prepared metal sheet and placed it on the processing table to cut it into 10 cm square specifications. Then adjust the mechanical arm, put on the micro glasses, adjust the focal length, and draw lines on the metal foil.
　　Characterize for a long time, occasionally stop, after a while, continue to characterize.
　　 "Shusha..."
　　In the research room of the machining sector, only the sound of metal cutting echoes, and it is extremely quiet...
　　 Richard is working quietly and meticulously in this quiet...
　　 One minute, two minutes, three minutes...
　　 Ten minutes, twenty minutes, thirty minutes...
　　 one hour, two hours, three hours...