I Have a Research Support System

Text 391 Xu Qiu, your brain is so big (seeking subscription)

Xu Qiu first glanced at the substrate after Mo Wenlin spin-coated and wiped through the glass of the glove box.

It was found that except for two slightly imperfect films, a few granular bumps appeared on the effective layer film. The other six films were made very well. The blue-green film was coated very uniformly, and the yield rate could be considered as 100%.

In the laboratory, as long as the film is not coated with obvious delamination or radial structure and other large-area defects, occasionally some granular protrusions, namely "point defects", will not affect the final small-area test. Avoid the defective part during testing.

"The coating technology has made great progress." Xu Qiu praised, and then skillfully reached into the evaporation glove box.

Mo Wenlin smiled and said: "Maybe this system is easier to apply. I used the PDI system before, and the film often has problems, especially when using chlorobenzene solvents, which are prone to radial patterns."

"Well, the pdi system is really difficult," Xu Qiuying said, and then shifted the topic to business: "The key to preparing translucent devices is the preparation of translucent electrodes. I chose thin-layer metal electrodes. Method of preparation."

"Um..." Mo Wenlin thought for a moment, and said, "That is the same as usual evaporation, but is the thickness of the metal electrode thinner?"

"Yes, the specific operation will be more troublesome than usual vapor deposition, and you need to use gold and silver at the same time." Xu Qiu explained as he put the substrate on the sample stage, paused, and added: " Later, I will ask you to help repeat some devices."

"Well, no problem." Mo Wenlin replied, and then stood by and watched Xu Qiu's operation seriously.

Xu Qiu first gave Mo Wenlin a shot. The "some devices" he mentioned just now are not the five or ten repeated devices of the previous binary system, but dozens of devices.

Because when preparing semi-transparent devices with thin-layer electrodes with different thicknesses from 10 nm to 20 nm, each electrode thickness needs to be prepared separately, unlike the binary system, even if the system is different, a batch of vapor deposition can be performed simultaneously.

It can’t be said that I evaporate 10 nanometers first, then take it out and test it, put it back, and evaporate 2 nanometers to become 12 nanometers.

This is obviously not feasible. If the device preparation process is not carried out continuously, there will be additional variables that will reduce the accuracy of the experimental results.

Assuming that each condition only prepares 5 batches of devices according to the minimum repeatability standard, the total of the six conditions requires at least 30 batches of evaporation.

Fortunately, in this case, the maximum number of device batches that can be prepared by evaporation per day can also be increased from two batches a day to three batches a day, because the operation before evaporation can be completed in multiple batches at the same time.

For example, a system can spin-coated 18 pieces at a time, then divided into three times, each time six pieces for evaporation and testing.

Moreover, the accuracy of the data obtained in this way will be higher, after all, it is an effective layer obtained by spin coating at the same time.

The disadvantage is that you need to be busy from morning to night, and you are tired.

Of course, you can completely split the work during specific operations.

For example, Mo Wenlin was responsible for the difficult spin-coating work, and then the evaporation work was handed over to Xu Xinjie, an undergraduate student who had just joined the group, or Yu Ya and Deng Hu were borrowed from Feifei Wu.

Yin Houlang can't count on it for the time being. He basically doesn't appear in Caiyi 216. He often ran to the Zhangjiang campus to learn organic synthesis skills with Wu Shengnan.

"This time I plan to evaporate 1 nanometer of gold and 9 nanometers of silver to obtain a thin layer electrode with a total thickness of 10 nanometers." Xu Qiu continued.

"Why do you need to vaporize two layers?" Mo Wenlin asked curiously.

"The density of gold is higher, and compared with silver, it is not easy to penetrate into the molybdenum trioxide and the effective layer below, and can form a dense continuous gold film..." Xu Qiu explained the previous idea.

"That's it." Mo Wenlin nodded, seemingly enlightened, and said: "Gold is equivalent to an electrode buffer layer."

"Well, almost." Xu Qiu replied, and then searched for the reagent bag and the reagent bottle containing the gold and silver evaporation targets, and two tungsten basket containers that had been ultrasonically cleaned with isopropanol, and prepared Loading.

The evaporation cabin has four beam source furnaces and two current heating devices. Generally, one beam source furnace is used to vaporize the transmission layer, such as molybdenum trioxide, and a current heating device is used to vaporize metal electrodes, such as gold, Silver, aluminum.

Today, two current heating devices and a beam source furnace device are needed.

The tungsten basket is made of high-purity tungsten. The middle of the basket is a basket structure where targets can be placed. The two sides extend out about 3-4 cm in length to be fixed.

The melting point of tungsten is very high. When electric current passes through the tungsten basket, it will produce high temperature. The high temperature can melt other metals, but the tungsten basket itself will not be melted.

Xu Qiu started loading the target.

The first is silver, because silver is cheaper, so the laboratory bought a lot of it at once.

The silver target is simply packed in a plastic vial similar to the size and appearance of a licorice tablet medicine bottle, one by one, each with similar specifications, about 0.5 cm in length, 0.3 cm in diameter, and obvious at both ends The cut marks that have been dented should be made by first making the silver into a wire shape and then cutting it.

Xu Qiu directly threw two silver particles into the tungsten basket. Normally, about 5 silver particles are used to deposit 100 nanometers of silver, but now 9 nanometers are deposited, two particles are definitely enough.

In theory, a silver pellet should be enough.

But in the matter of evaporation, I would rather use more than less, because once less, this batch of devices will be discarded.

After all, the experiment of vapor deposition has non-fixed loss, and the degree of loss is different according to the vapor deposition rate. Generally, the slower the vapor deposition rate, the more the target material is lost.

When preparing thin-layer electrodes, in order to make the metal electrodes continuous and uniform, the evaporation rate must be reduced.

The tungsten basket containing the silver target was fixed on the current heating device, and Xu Qiu continued to load the gold target.

The gold target is packed in a transparent plastic bag. The original factory may have an opaque plastic bag outside the transparent plastic bag for safety reasons.

Gold is more expensive, the purity used in the laboratory is at the 99.99% level, and the price is more expensive than the 10,000 pure gold on the market.

Of course, the price also fluctuates, and the price is different every time you find a company that specializes in target materials.

Xu Qiu occasionally receives news from the target company's sales: "The price of gold has recently been on the rise again, dear, do you want to buy some gold targets in the laboratory?"

This batch of gold targets is also cylindrical, with a diameter of about 0.3 cm, but the length is relatively long, about 0.8 cm, and it is a relatively standard cylinder with no shear marks at both ends, and it is slippery.

Xu Qiu took out a gold target, cut it into three pieces with clean scissors, put one piece into the tungsten fistula, and put the other two pieces back into the plastic bag.

Usually 100 nanometers thick gold is deposited, using about 2 silver particles. Now for 1 nanometer, one third of the particles should be enough.

The price of gold is relatively expensive. If it can be saved, save a little.

Xu Qiu used the same operation method to fix the tungsten basket on the current heating device, took out the molybdenum trioxide beam source furnace, replaced some new molybdenum trioxide, and said after completion: "Mo Wenlin, turn on the mechanical pump."

After finishing speaking, Xu Qiu returned the door of the vapor deposition cabin to its place, and firmly grasped the two handles on the cabin door against the cabin door, keeping the interior of the vapor deposition cabin sealed and not in contact with the glove box outside.

"Okay." Mo Wenlin pressed the mechanical pump start button and a roar sounded.

After an interval of three seconds, Xu Qiu pulled the two handles of the vapor deposition chamber to the outside. When he found that he couldn't pull it off, he released his hand and slowly exited the glove box.

It is said that this method of closing the cabin door was first proposed by Feifei Wu.

This is a non-mainstream method of closing the cabin door. The principle used is to make the air pressure in the vapor deposition cabin lower than outside the vapor deposition cabin so that the vapor deposition cabin door will not fall.

As long as the door is kept sealed for the first few seconds, the door will not fall when there is a pressure difference.

Just when the inflatable door was opened, the air pressure was balanced and the door would fall onto the track and make an impact sound. When Xu Qiu first joined the research group, he was teased by the school sister once because of this.

The main purpose of this operation is to save time.

If it is a conventional door closing operation, it is necessary to wind the two large screw structures on the vapor deposition cabin door dozens of times to fix the cabin door, that is, lock the door, and when the cabin door is opened, the door needs to be opened again. When the lock is opened, if there is no one outside to help, you still need to go in and out of the glove box to operate the console yourself. These trivial steps add up to about five minutes.

It takes five minutes to vaporize a batch of devices, and 500 minutes to vaporize 100 batches of devices.

In the process of experiment operation, as long as it does not affect the safety of the experiment and the safety of the instrument, the operation that can save time is of great significance~www.ltnovel.com~ What is the result?

The vapor deposition can be carried out when the vacuum reaches the level of ten minus five Pascals, and it takes a while.

As a result, Xu Qiu and Mo Wenlin returned to the office. Han Jiaying did not come to the laboratory for something this afternoon, and their exchanges became more frequent.

If it is normal, when the school girl sees the two exchanges too much, even if it is related to scientific research, she will also watch next to her. If she encounters a field where she knows, she will squeeze Xu Qiu under the banner of "helping my girlfriend" go.

In this regard, Xu Qiu was a little helpless, but he did not reject the behavior of the school girl, so he let it go.

After the two sat down at their desks, Mo Wenlin asked: "Can this type of translucent device also be used in the ternary system?"

"It's not necessary..." Xu Qiu said subconsciously, but he changed his mind and overturned his previous judgment: "In fact, it can also be used in the ternary system, such as developing translucent devices of different colors. This is indeed a ternary system. One advantage of the system over the binary system is that it can control the ratio of three different color materials like the color palette to adjust the color, so that you can get a variety of colors of translucent battery devices, without additional dyeing... …"

"I have an idea," Xu Qiu snapped his fingers suddenly, and said: "We can prepare a batch of devices of different colors based on a ternary blend system, and then use these devices to create a painting, such as " Scream" or something, how? Is this a very bright gimmick."

Movinlin paused for a while, then said quietly: "Xu Qiu, your brain is really big..."

ps: Happy New Year's Eve everyone~

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