Chapter 118: From 9.99% to 10%

　　 The first film, the efficiency is 9.61%, 9.57%, 9.54%...
　　 The second film, the efficiency is 9.77%, 9.79%, 9.81%, 9.72%...
　　 It seems that the real hot spin coating method is really effective and has broken the previous record.
Can 　　 be further improved?
　　 The third film, the efficiency is 9.96%!
　　 There is a show for breaking 10%, Xu Qiu suppressed his excitement and continued to test.
　　9.99%, 9.99%, 9.97%, 9.92%...
　　 is only up to 9.99%...
　　 Xu Qiu did not believe in evil, and continuously tested 30 sets of data, but the lower the test later, none of them started with 10%, and finally stabilized at about 9.6%.
　　The fourth and fifth films...
　　 test all substrates.
　　 The highest efficiency is 9.99%!
　　 Is this playing me?
　　 Is the system deliberately teasing me?
　　 "System thief, come out to me." Xu Qiu shouted.
　　……
　　 waited for a long time, but did not receive a response, he gradually calmed down.
　　 The system shouldn't be so boring to tease him, it should be just a matter of luck.
　　 Although there is not much difference between 9.99% and 10%, for mild obsessive-compulsive disorder, this 0.01% can't be mentioned, and I always feel uncomfortable.
　　 Xu Qiu secretly made up his mind to improve this efficiency even if he didn't sleep tonight.
　　 Just as he was about to leave the evaporation glove box and prepare a new batch of devices, his gaze stayed in a corner of the glove box.
　　 That is a bag of shiny gold targets.
　　 These gold targets are cylindrical, about 1 mm in diameter and 3 mm in length, with cut marks on both ends.
　　 It looks like it should have been cut from a piece of gold wire.
　　 Xu Qiu suddenly discovered that he had been focusing on the improvement of the effective layer before ignoring the transmission layer and electrode materials.
　　 It is more difficult to replace the transmission layer, but it is relatively easy to replace the electrode material, especially the metal electrode on the top of the battery.
　　 There are three commonly used metal electrode materials, namely aluminum, silver, and gold.
　　 Aluminum is often used as electrodes in laboratories. On the one hand, aluminum is the cheapest because of the price. On the other hand, the electrode material has little effect on the performance of the device.
　　 However, when the impact is high, the influence of the electrode cannot be completely ignored.
　　 As for these three kinds of electrodes, which electrode is the best, there is no conclusion.
　　 The work functions of the three electrodes are different, which will bring about an impact on the energy level structure, which is different for different effective layer systems.
　　 Therefore, if you want to know the result, you still have to know after the experiment.
　　 The batch of devices just made has the highest efficiency of 9.99% and corresponds to the processing conditions, which is true thermal spin coating at 110 degrees Celsius.
　　 Xu Qiu quickly spin-coated four pieces under this condition.
　　 Several of the materials he copied before in Lab 216 are now in handy.
　　 He vapor deposited molybdenum trioxide/silver and molybdenum trioxide/gold in the vapor deposition glove boxes in two laboratories.
　　 test device.
　　The device based on silver electrode has the highest efficiency of 10.13%.
　　 The performance of devices based on gold electrodes has decreased, only 9.68%.
　　It seems that the more expensive the material, the better, and the right thing is the most important thing.
　　 Finally, the efficiency exceeded 10%.
　　 can sleep at ease.
　　……
　　 The next afternoon, the laboratory.
　　 "Wait for the atomic force microscope AFM test, I will go alone," Chen Wanqing said:
　　 "You are here to make the device, and I will do the preparations for you."
　　 "Okay." Xu Qiu nodded.
　　 Before he copied the AFM skills of Mr. Xu Hui, he had already learned the operating methods and instrument principles, so he didn't need to learn it again on site.
　　AFM test, you can get the fluctuations of the film surface.
　　 It brings an atomic-scale thin probe close to the surface of the sample. At this time, there is a very weak repulsive force between the probe and the atoms of the sample under test.
　　 to ensure that this repulsive force is constant, then the distance between the probe and the sample can be considered constant.
　　 Scan the surface of the sample. According to the position of the probe in the vertical direction, the height of the undulation of the sample surface can be determined.
　　Operations are controlled by computer software. Whether you can draw a good-looking image is a test of the operator's skill.
　　 In addition, there is one more thing to pay attention to, that is, do not break the sharp probe.
　　 Looking at the back of the senior sister, Xu Qiu prayed silently in his heart, hoping that nothing would go wrong.
　　……
　　 spin coating, spin coating...
　　 Xu Qiu was concentrating on the experiment, and suddenly from the reflection of the glove box glass, he saw a figure behind him.
　　 Looking back, Han Jiaying stood behind her, she said:
　　 "Brother, is there anything I can help."
　　 Xu Qiu thought for a while and said:
　　 "Not for the time being, please see me do the experiment first, and then look for opportunities for you to practice."
　　 spin coating, vapor deposition.
　　 Silver electrodes were used for vapor deposition today, and other conditions were explored last night.
　　Although he knew the result in advance, Xu Qiu was still a little nervous.
　　 After all, the experimental value fluctuates. In case this batch can't reach 10%, you will have to do a few more batches later.
　　 is mainly the data made in the simulation laboratory, which is not easy to use directly.
　　 Doing experiments on my own, people are basically watching the whole process, it is difficult to make things out of nothing.
　　 Simulation is simulation, and reality is reality, so it should be more rigorous.
　　……
　　 Xu Qiu directly finds the substrate with the best conditions and tests it.
　　 The highest efficiency is 10.18%.
　　 Seeing that it was a little bit higher than the simulation result, Xu Qiu breathed a sigh of relief.
　　 "Brother, more than 10%, more than 10%!" Han Jiaying shouted.
　　Why is this guy more excited than him. UU reading www.uukanshu.com
　　 It's normal to think about it, after all, I was already excited about getting the result last night.
　　 Hearing the shout, everyone else in the laboratory was startled.
　　 Duan Yun and Tian Qing walked over directly from the side, and even Wu Feifei, who was codewords outside, stopped codewords and leaned over.
　　Only Chen Wanqing was still testing AFM next door, but failed to see this scene.
　　 Wu Feifei: "Congratulations, brother."
　　 Haru Tian: "10%, okay."
　　 Duan Yun: "Don't forget to treat you when you post."
　　Wu Feifei and the others do not know much about organic photovoltaics, but they can get a general understanding through the group meeting.
　　 also knows the 10% efficiency, which is the weight of the current organic photovoltaic field.
　　 This is a big event in the laboratory.
　　……
　　 It was lively for a while, and everyone was busy again.
　　The younger brothers who have entered the research group for less than half a year are already so strong, so they have to work harder.
　　 Tian Qing helped Xu Qiu's system to test CELIV and TOF.
　　 Duan Yun set up equipment, Wu Feifei continued to write articles.
　　 Xu Qiu got the key data and was in a good mood.
　　 He taught Han Jiaying how to test the photoelectric performance of the device and asked her to test the remaining devices.
　　 "Guaranteed to complete the task." Han Jiaying looked excited and took over the glove box.
　　 Of course, Xu Qiu will definitely not tell her. The main reason is that he knows that among the remaining devices, there is a high probability that higher performance will not appear.
　　……
　　 It was nearly half past five, and Han Jiaying completed the test.
　　 She was a little depressed. The efficiency of the remaining devices was less than 10%. She originally thought that she could measure one that exceeded her brother.