In fact, this incident hit Wu Lihong quite hard, and even gave him the idea of taking a back seat again.

But he didn't get the photoresist, and he was always unwilling.

Now that Kangchi is willing to help, it is naturally very good for him.

But he was also afraid of betraying Kangchi's trust and letting his money go down the drain, so he was also a little hesitant.

"Although I know that you are now a little successful and have made a lot of money, but after all, the money is not blown by the wind, so you are not afraid of being lost?"

"I'm afraid, but if I'm afraid, I won't engage in research and development?" Kang Chi immediately replied, "And I didn't give the money to your institute for free, I also have a share in the results, in other words, this is to let the dignified academician Wu come to help me work, others are envious and not envious, but I am still worried that you will hinder your face and do not want to." ”

“……”

Kang Chi's words successfully amused Wu Lihong, and his worries were much less.

"That's okay, I'll discuss with the courtyard when I go back, try to help you get a better cooperation plan, and thank you for trusting me so much, an old man who is about to enter the ground."

"Don't say that." Kangchi hurriedly said, "In addition to photoresist, there are many etching materials waiting for you to show your skills...... You have been studying for so long, you can distribute the benefits however you want, there is no need to be partial, and I am not here to take advantage of the fire. ”

"In addition, this time, I want to borrow your laboratory by the way, can I make a sensor chip?"

"Sensor?" Wu Lihong said suspiciously, "Why are you suddenly interested in photosensitive chips again?" ”

"I want to help Daqin Optics build a camera."

“……”

Sure enough, he has to be a young man,

Energy is abundant.

Wu Lihong couldn't help but sigh in his heart.

Coupled with the project of oil extraction insects, he is already a third-line battle, right?

And each line, the difficulty is not small.

"Are you busy?"

"It's okay, just wait until you get through this time." Kang Chi smiled, "It's not a very urgent matter, just take your time, and when this time is over, I'll rest for a few more days." ”

"Well, although you are still young, you usually have to pay more attention to your body, and the road ahead is still very long, so you won't be in a hurry to ...... in a while."

"Don't worry, I'm measured."

——

After the visit, Kangchi followed Wang Haowen and came directly to the Suzhou Institute of Microelectronics, ready to borrow the equipment here to rub a simple version of the photosensitive chip.

For Kangchi, the camera should be a familiar thing, and the core technologies in it are actually two, one is the CMOS sensor and the other is the imaging system.

Although the rest of the mechanical and electronic structures are also very precise, he was already familiar with them when he opened the repair shop, and now that he has accumulated so much professional knowledge, it is not difficult to reverse the camera.

The only thing that restricts him from building cameras is that he does not have a complete set of chip-making equipment.

When wearing protective clothing with Kang Chi, Wang Haowen finally couldn't help asking: "Senior Brother Kang, you don't seem to have prepared anything, just start it directly?" ”

"Questions?"

"It's a big problem, it's good or not......"

Wang Haowen strongly doubted that Kangchi knew how to make chips......

Kangchi just smiled and explained: "This time, I actually just went through the process to verify the principle, even if it is to build a CMOS with only 100 pixels, and there is no need for such complicated steps." ”

"One hundred pixels?!"

Wang Haowen was immediately shocked.

However, when Kangchi first started working on chips, he sent him a 2D acceleration card to verify his so-called 'principle'.

It can only be said that

The way the great god studies is different from that of mortals such as you.

Of course, 100 pixels is just an exaggeration of Kangchi, and it is necessary to try to create a sensor with better performance according to the actual situation here.

Although he doesn't lack general experience for upgrading for the time being,

But if you can save it, you can save it, and you may be able to use it when you can.

The structure and principle of CMOS photosensitive chips are actually simpler than ordinary chips, and the technical difficulties are mainly reflected in the manufacturing process and materials.

In terms of design, the sensor chip can be said to be completely undifficult, and it is a chip type with a very high repetition rate of drawings.

For example, a 20 million pixel sensor sensor, in fact, the chip structure of each pixel is the same.

As long as the silicon wafer substrate is photolithography, a uniformly arranged photodiode is manufactured, and then the color filter is manufactured through the etching process on this diode.

The specific working principle is actually not difficult.

We can think of a color filter as a window with four square pieces of glass, and the colors of these four pieces of glass are red, green, blue, and green.

Then, when the outside light shines through the glass and shines into the room, the four photodiodes arranged in the room can identify the light intensity of the four areas and restore the color and brightness of the light that comes in.

In other words, a 20 million pixel CMOS requires 80 million photodiodes and color filters.

And in order to ensure that the light conditions for each pixel to absorb light are the same, they can only be arranged flat on the silicon wafer, and cannot be stacked into a complex urban structure by etching like other chips.

That's why it's very difficult for sensor sensors to achieve high pixels.

It's just too much of a process.

If a 90nm process lithography machine is used to make a photodiode, because of the principle of a pixel 2X2, it is equivalent to a 180nm process.

And because it can only be tiled, in the case of chip size limitations, only pixels can be reduced.

Therefore, some mobile phone manufacturers brag that their mobile phones have 100 million pixels.

Actually, it's good to listen to it.

Think about it and know that with a lens the size of a mobile phone,

How big can the CMOS chip be inside?

Even if the most advanced EUV lithography machine is used, the photodiode inside will never reach the level of 400 million tiling.

The actual estimate is not even 10 million,

The rest of the pixels are all fake pixels that are calculated by the processor to make people happy.

Moreover, the smaller the manufacturing process, the more difficult it is to manufacture the etching of the color filter, and the performance requirements for the material used for dyeing in etching: color photoresist, are even more demanding.

However, Kangchi's current requirements are not high, just rub them casually, and do as many pixels as you can.

There is also no requirement for the performance of the color photoresist, just let Wang Haowen mix it, and the requirements are just that you can't tell the difference between red, green and blue......

Although it was rubbed by the way, in fact, Kangchi still stayed in Lin'an for almost a week.

The main reason is that the production of the mask is more time-consuming, and because it is only a one-time one, in order to pursue cost performance, Kangchi has to reduce its accuracy requirements.

[Item: Photosensitive Chip]

【Manufacturer: Kangchi】

[Item Level: 1]

[EXPERIENCE: 0/500]

[Item Condition: Intact]

[Item parameters: 500,000 pixels]

[Parsed item: No parsed item]

[General experience: 50314]

[Mastery Points: 12.3]

Looking at the low-energy chip in his hand, which is as large as the 35mm format sensor and has only 500,000 pixels, Kangchi can't help but sigh again, the chip is really burning money.

This tape-out cost Kangchi nearly two million,

And that's already a money-saver,

If you come up and build a set of masks for the mid-end process, it will be tens of millions of wastes, and at the same time, you will waste more time.

Wang Haowen saw that Kangchi directly received the made chip into the container, and he was ready to flash people, and couldn't help but ask suspiciously: "Don't you need to test it?" ”

"Testing?"

The system panel has popped up, what else is it to measure?

Kang Chi smiled: "No, I have already tested it in my heart." ”

Wang Haowen: "??? ”

(End of chapter)