Chapter 369: 1 mind difference

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Yang Qin led everyone into the organic laboratory, pointed at the instrument in the fume hood and said, "This is the squeegee instrument we designed."
Seeing the instrument placed directly in the air, Xu Qiu was stunned: "It turned out to be a device made in air. It is understandable that the performance of the device is low. The PCBM system is still relatively sensitive to air."
Yang Qin explained: "I originally wanted to put it in the glove box, but now this squeegee instrument often has problems. It is easier to fix it outside."
Xu Qiu suggested: "I suggest you try the non-fullerene system. The several non-fullerene systems developed by our group have good stability."
Yang Qin asked,
Is there any recommended system? I was an OFET before, and I didn’t know much about organic photovoltaics, especially the latest work. I didn’t know much about the latest work. I left school and didn’t have campus resources. I wanted to download the literature. Very troublesome."
Universities and other scientific research institutions will purchase the legitimate reading rights of major academic journals. Therefore, as long as you log on to the campus network during school, you can directly download most of the literature. If you leave the school and want to download the literature, if you buy it yourself, An article costs dozens of yuan.
Of course, there are also methods that do not cost money. For example, you can directly send a letter to the corresponding author of the article, and the other party will give it with a high probability, but I don’t know when to reply. download. In addition, periodicals also have pirated websites, but many people don't know it, and it is not good to use pirated copies after all.
Xu Qiu thought for a moment, and said, "It's easy. You can go to the "Madu Comprehensive University Wei Xingsi" directly, then go to the homepage of our research group, and find the paper with "QiuXu" in the title."
"That's OK, I'll check it out later, QiuXu..." Yang Qin reacted, "You are Xu Qiu, right? I heard Lan He talk about you before."
"Yes, it's me," Xu Qiu added: "If you need materials, our team can also provide them, but we still have to talk to our instructor about how to do it."
"Okay, I'll talk about the situation with Blue River later." Yang Qin nodded, then pointed to the fume hood and said, "I will introduce you to our squeegee equipment first."
"The current structure of this instrument is relatively simple.
"The first is a sample platform, on which the substrate can be placed, and there is a fixing device, and the bottom is a heating device, which can provide a certain temperature and ensure the fluidity of the solution.
"The side of the sample platform is a rail, on which there is a cantilever that can move back and forth, and a razor blade is embedded at the bottom of the cantilever.
"The cantilever is connected to a controller, which can control the speed of the blade movement and the distance between the blade and the substrate.
"When the instrument is working, the cantilever with the blade is slowly moved to the other side from the position where the solution is dripped from one side of the substrate, and the scraping operation is completed."
Xu Qiu nodded, and what Yang Qin said was almost the same as what he had learned from the literature reading.
However, judging from the current situation, Lanhe and Yang Qin still have a long way to go, at least there is still a long way to go in terms of process improvement.
On the one hand, the squeegee uses a razor blade, which is okay in the initial stage. In the future, it must be a micro-nano processed blade, so that the thickness can be accurate;
On the other hand, the devices they are squeegeing are small-sized devices of 1 cm 3 cm, and they can't take advantage of the squeegee coating. They will still develop to larger sizes in the future.
These are two relatively obvious problems. If you dig deeper, other problems will arise.
For example, what material is the scraper used for, metal, ceramic, or other materials?
For another example, if we want to develop to a larger size, should we increase the width of the squeegee?
Of course, Yang Qin must be aware of these issues. After all, he is a Ph.D. from Jiaotong University, a friend school, and he must have basic R&D capabilities.
Therefore, Xu Qiu didn't mention it. After all, he came here as a guide instead of developing instruments and researching craftsmanship himself.
Xu Qiu feels that his main advantage lies in his understanding of the field of organic photovoltaics and the development of a large number of new materials. Next, he can give his opinions mainly from these two aspects.
At this time, Yang Qin handed over a few gas masks to Xu Qiu's trio and said, "I will show you the process of scratching. The gas masks are new."
Han Jiaying spit out casually: "I haven't used the'pig nose' for a long time. I didn't expect to use this one here."
Yang Qin explained: "No way. The solvent is chlorobenzene. You have to use a few milliliters of solvent each time. Just use a fume hood here. I'm afraid it won't be clean."
Xu Qiu said: "Speaking of this, I suggest you to develop towards non-fullerene materials. Some systems are compatible with non-halogen solvents. Solvents with chlorine atoms like chloroform and chlorobenzene are not only toxic to humans. , It is also harmful to the environment. In the future, you can consider changing to tetrahydrofuran, THF, instead of wearing a gas mask."
Yang Qin nodded: "Okay, I will try later. The smell of chlorobenzene is indeed too strong, and it will stick to the clothes."
In fact, Xu Qiu had tried various solvents in the simulation laboratory before.
Generally speaking, chloroform, chlorobenzene, solvents with chlorine atoms are indeed effective, but some systems using THF can also show good device performance, but Mr. Wei uses a glove box to operate. It is too good to change the solvent atmosphere rashly, because it may cause unknown effects.
Many fields are one thing in the laboratory, but another thing when it comes to industrialization, and various problems will arise.
For example, if the current problem of chloroform and chlorobenzene solvents is not solved, even if other conditions are fixed, workers have to wear chemical protective clothing and gas masks for a long time before they can work during industrial scratch coating processing.
And all protective devices have limits. It is impossible to isolate toxic solvents 100%. If you work for a long time, workers will definitely be chronically poisoned.
This is why electronics factories, those who wear chemical protective clothing and gas masks, can get 1K and 2K more than other types of work each month.
Without it, sacrificed health in exchange.
After the three of Xu Qiu put on their masks, Yang Qin began to operate.
He first turned on the heating device of the squeegee coating instrument, set the temperature to 60 degrees Celsius, and then started the heating and stirring table next to it, set the temperature to 60 degrees Celsius, and the speed of 300r.p.m. to stir the PCE10:PCBM and PFN solutions.
Among them, PCE10:PCBM is the effective layer solution, which is packed in a small brown bottle that is protected from light. PFN is a polymer transmission layer material developed by Zang Chaojun and Lu Changjun. It is used to replace the traditional PEDOT:PSS transmission layer to build a positive The structured device is packed in a colorless and transparent glass bottle, the solution is also colorless and transparent, and the viscosity is not large.
Xu Qiu's usual device structure is an inverted structure device with zinc oxide as the transmission layer. Now Yang Qin and his colleagues use a flexible substrate, which cannot be annealed at high temperature. It is difficult to use a zinc oxide structure, so they choose PFN as the transmission layer material.
Next, Yang Qin removed the razor blade from the cantilever, replaced it with a new blade, then cleaned the sample platform, placed a flexible substrate substrate, and used a clamp to stretch and fix the substrate. Finally, use The controller regulates the position of the blade, which is approximately 3-5 mm above the sample.
Among the three people who came here, the school girl paid the least attention to the Blue River Lab. Basically, she came to join in the fun and beat soy sauce. The school girl was the most concerned about the situation in the Blue River Lab.
"How can this height be controlled by visual inspection?" After putting on the gas mask, Chen Wanqing's voice was a little irritating.
Yang Qin smiled awkwardly: "Yes, it's visual inspection now. I have suggested that Blue River hire a programmer to write the control program. I'm currently interviewing."
Chen Wanqing shrugged: "Well..."
This is probably the true portrayal of science and technology companies. To some extent, science and technology companies are similar to doing scientific research. They are both exploring a more cutting-edge field. It is just that science and technology companies are commercialized applications and the price of failure. Very large, the probability is also high, if successful, the harvest will naturally be high.
After the temperature of the two heating stages was maintained at 60 degrees Celsius, Yang Qin began the knife coating experiment, first with the PFN solution.
Using a one-ml disposable syringe with the needle removed, he sucked about 200 microliters of the solution, squeezed it out to the side of the flexible substrate, and activated the console.
The blade slowly scrapes over the substrate, driving the solution through the substrate, forming a thin film.
After that, an annealing operation at 100 degrees Celsius is required to completely volatilize the remaining solution on the film.
The whole process consumes a little longer time than spin coating. Another problem is that it costs more solution. Normal spin coating only needs 70-100 microliters, if it is spraying, it only needs 15-20 microliters, but scratch coating requires 200 microliters. Rise.
Yang Qin continued to use the same method to scrape an effective layer of PCE10:PCBM.
During the annealing process, Chen Wanqing asked: "How to solve the other transport layer and electrode? Is it a full solution method?"
"Yes," Yang Qin replied: "The other transmission layer material is PDINO, and the electrode material is silver nanowires, which are prepared by knife coating and drip coating." PDINO is a derivative of PDI, which can be As a transport layer, it replaces the metal calcium of the positive structure.
"I thought it was vapor deposition," Xu Qiu said. "If this is the case, you can achieve 3% and 4% efficiency, which is actually not low."
"Yes," Yang Qin nodded, "but the device performance is a bit unstable."
Afterwards, Yang Qin scraped PDINO again and dripped silver nanowire electrodes to complete the preparation of a batch of devices.
Because the full-solution method does not require evaporation, the overall speed of device preparation is faster than in the Wei Xingsi group. It only took more than an hour to eliminate the operation of solution preparation and substrate cleaning.
After the experiment, the four took off their gas masks, left the chemistry laboratory and returned to the device laboratory. Yang Qin handed the newly prepared device to one of his colleagues.
At this time, Xu Qiuyin felt something was wrong. He counted the heads and found that with Yang Qin, there were a total of six white coats in the room.
Taking a closer look, Blue River actually went to battle to do the experiment in person.
Blue River glanced at the people and said, "Yang Qin, take them to the office and sit for a while. I'll come over soon."
"Okay." Yang Qin led Xu Qiu to the next office, and then used a disposable paper cup to help with three glasses of water from the water dispenser.
After sitting down, Xu Qiu asked casually, "How long has the laboratory been constructed here?"
Yang Qin thought for a while and said, "I started in the spring for more than half a year. I have been renovating for the first few months. I just finished the device lab almost two months ago. Then I kept trying and failed. , The efficiency just broke 4% last week. This week, Blue River invited you."
Chen Wanqing’s focus is unique: "Joining in spring?"
"Yes, UU reading www.uukanshu.com" Yang Qin said helplessly: "On the other side of Jiaotong University, my tutor did not let others go, so it was postponed for half a year. By the way, you are all from the Modu University?"
"Well, let me introduce it to you," Xu Qiu said on the initiative: "I am a freshman of this year's direct Ph.D., Bo Yi, this is my younger sister, Han Jiaying, who just undergraduates her senior year, and this is my senior sister, Chen Wanqing. Dr. San, graduate next year, um, the doctorate in our school is three years."
"Three years, it's great," Yang Qin shook his head and sighed: "Hey, I had a bad idea at the time and chose Jiaotong University. If it weren't for my tough attitude, I guess the tutor would have to delay me for a year."
"Actually, it's almost the same everywhere," Chen Wanqing comforted: "Now the professors in our school have heard that they have been cooperating to advise the school that they will increase the Ph.D. period to four years. Maybe it will be changed in a few years. "
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