I Have a Research Support System

After completing the SEM and XRD tests, this work on the perovskite transport layer material also took shape.

The remaining work is the repeatability test of the device, the stability test and the writing of the article.

When two people do the same job together, the efficiency is increased by more than 80%.

After discussion, the two determined the division of labor:

The senior sister is responsible for completing the first draft of the thesis, which is because she has more experience in writing thesis.

Xu Qiu continued to conduct experiments, and finally refined and polished the paper.

...

In the next few days, Xu Qiu repeatedly made two batches of positive structure devices, and the highest efficiency reached 10.52%.

It has only increased a little, and it seems that 11% is hopeless.

The inverted structure has also made a batch of devices, which is the same as the previous simulation results, and the highest efficiency is only about 8%.

At the same time, he also tested the stability of the photoelectric performance of the first batch of devices in a nitrogen atmosphere, testing a data point every day.

After a week, the highest efficiency can still be maintained above 10%, indicating that the time stability of the system under nitrogen atmosphere is not bad.

…………

weekend.

Because Xu Qiu's device performance data was sufficient, he did not continue to make devices, but gave up the glove box to Wu Feifei.

Usually, the two of them do experiments alternately, and they can each make a batch of devices throughout the day and complete the test.

But the weekend is only half a day, so only a batch of devices can be made, so Xu Qiu didn't join in the fun.

He found Chen Wanqing and said:

Senior sister, when will we discuss the synthesis of donor materials? Isn't the group meeting going to make a report tomorrow?

Wait for me... for half an hour, I'll write the description of the performance of the device. Chen Wanqing said.

OK.

Xu Qiu had nothing to do, so he found some latest literature and started reading.

half an hour later.

Xu Qiu glanced at the senior sister's progress, and made a rough estimate in his mind. It was almost half completed, and it was estimated that he would have to wait for more than half an hour.

Hey, she might have misunderstood half an hour.

After thinking about it, Xu Qiu decided not to disturb her.

After all, writing an article also needs inspiration. What if the senior sister is in a state of thinking like a spring, and she is disturbed by herself and loses inspiration.

Continue to read the literature.

Another half hour later.

Chen Wanqing saved the draft of the thesis, leaned over her head, and said:

Xu Qiu, I'm fine, you are reading literature.

Xu Qiu glanced at the time, and sure enough his estimation was very accurate, he said calmly:

That's right, let's start then, do you have any synthesis ideas, senior sister?

My opinion is……

Suddenly, harsh sirens came from the direction of the laboratory.

This sound, is there something wrong with the evaporation device? Chen Wanqing asked doubtfully:

Generally there is an alarm sound, it is the case of forgetting to turn on the circulating water or air pump, and it will be fine to turn them on again.

But the alarm sound lasted for more than ten seconds and didn't stop.

Xu Qiu stood up, put on his lab coat, and said:

Let me go and have a look.

Alright, be careful, call me if you have any questions. Chen Wanqing said.

Entering the laboratory, Xu Qiu saw Wu Feifei standing in front of the evaporation console, seeming to be checking the equipment.

What's wrong? Xu Qiu asked.

Not sure, I checked that the circulating water and air pumps are on.

I also wonder why there are sirens?

After Wu Feifei finished speaking, she seemed to have discovered something and said:

Wait, something's wrong here, molecular pump overheat protection?

This is the first time this has happened.

Xu Qiu also leaned over, and he saw Warning, molecular pump overheating protection displayed on the panel of the molecular pump module, and the speed of the molecular pump was 0 at the same time.

Looking at the barometer above, it is now 3.2E-3 Pa, and the value is slowly increasing.

It seems that the molecular pump has stopped working, and only the mechanical pump is working, which cannot maintain the vacuum in the evaporation chamber.

He thought for a while and said:

Wu Feifei, turn off the device first, and we'll investigate the cause later.

Wu Feifei turned off the molecular pump, mechanical pump and evaporation machine in turn, and the alarm finally stopped.

Xu Qiu analyzed:

The reminder just now is the overheating protection of the molecular pump. It may be a problem of heat dissipation. Could it be a problem with the circulating water system?

It makes sense, but the circulating water system has already been activated. Wu Feifei said.

How about this, I'll go inside and have a look first, Xu Qiu said.

The principle of the circulating water system is very simple. Its main body is a water storage tank with a cooling device inside to reduce the water temperature. There is also a water inlet and a water outlet, which lead to a pipe respectively.

Water flows out from the water outlet, flows in the pipe, passes through the device that needs water cooling, uses the high specific heat capacity of water to take away a large amount of heat, and finally returns to the water storage tank from the water inlet.

For this device to work properly, the water level in the storage tank needs to reach a certain height.

Because the circulating water system is placed in the gap between the console and the glove box, and there is a laboratory bench next to it, so it is not easy to get in.

Usually, if you want to turn it on, you use a long wooden stick to poke its start button.

Xu Qiu cut off the main power supply of the evaporation equipment, and carefully entered from the gap between the console and the glove box sideways.

He felt something wrong with his feet on the ground.

Looking down, there is a puddle of water on the ground, extending from the floor under the water circulation system.

Xu Qiu hurriedly shut down the circulating water system and unplugged its power plug to prevent electric shock.

Then, he bent down to look for the leak, and found that the water was flowing out from the spout drop by drop.

Seeing this, he opened the lid of the water storage tank and looked inside it.

The water level is already lower than the lower limit of normal use, and the water inside is very dirty, it must have been cleaned for a long time.

I found the reason. The water level of the circulating water was too low, which made it unable to operate normally and played a cooling role, so the molecular pump overheated and alarmed. Xu Qiu said.

That should be because the water inside has evaporated, Wu Feifei said with a sigh of relief:

The circulating water has not been changed for several months. If this is the case, it should be enough to add some deionized water.

No, it's not just a matter of low water levels, Xu Qiu said:

The circulating water is still leaking.

Leaks in laboratories are no small matter.

Wu Feifei took back the sigh of relief just now, and asked nervously:

Is the leak serious?

Fortunately, we discovered it early, and only missed a little bit, Xu Qiu said:

Use a water pump to pump out the water inside first, and then use toilet paper to absorb the water on the ground.

But we don't have a water pump. Wu Feifei said.

Isn't there a fish tank in Mr. Wei's office? Guess how he changed the water for the fish tank. Xu Qiu said.

But... Wu Feifei hesitated.

If you don't need a water pump, then take a hose and use the siphon effect to suck out the water inside, Xu Qiu said:

It's just going to be a bit slower and maybe more water will leak.

Then I'd better ask Teacher Wei.

There is a new round of recommendation this week, please recommend a ticket. One more update will be added at twelve o'clock tonight.