Chapter 128: Outlook

　　 "Finally voted out, this article should not have a big problem with AM, and the work is relatively solid."
　　 Teacher Wei paced in the office and said to herself:
　　 "I was afraid of being published first by other research groups. Now our work has finally been voted out, and it can be regarded as a stone falling to the ground."
　　 Xu Qiushen agrees. During this time, he worked very hard to experiment, which is largely because of this.
　　 In most cases, doing scientific research is like fighting the sky.
　　 In the case of such a small probability collision experiment, it is not only necessary to fight against the sky, but also against the people.
　　 is really double the joy.
　　 After the article is delivered, you can breathe a sigh of relief.
　　 For example, research group A submitted a paper, reporting that they discovered the material P2FBT4T-2OD.
　　 Even shortly after submission, group B published similar work in other journals, group A shouldn’t worry too much. They can claim that the two groups discovered this material at the same time.
　　 In such a case, it is generally not rejected on the grounds that
other people have published similar work
.
　　Unless the writing is too bad, or the manuscript is rejected for other reasons, it will be affected.
　　 But if research group B publishes an article before research group A submits, then research group A cannot claim that
it is the first to discover this kind of material
.
　　 And when the article is submitted for review, it is likely to be sent to the B research group.
　　Because editors use big data analysis when selecting reviewers.
　　Researchers and experts in the field who have published similar work will be given priority.
　　 At this time, research group A must not only cite the article of research group B, but also find other innovations. The grade of the article will also drop a lot, which is considered useless.
　　……
　　 As for the fate of Xu Qiu after this article, we can only look at the peer review and the recognition of this article by other researchers.
　　 This is not something they can control.
　　 Generally, this kind of large article has five to seven reviewers, and at least half of the reviewers must give positive opinions. Some journals even require all positive opinions before the article may be accepted.
　　 Therefore, there is also a part of luck in it.
　　 "I have worked hard for you recently, do I need to give you a few days off and take a good rest." Teacher Wei said.
　　 Xu Qiu looked at the senior sister, and saw that she shook her head and said, "No need."
　　 "Neither do I."
　　 Anyway, Teacher Wei’s attitude is already here, and he actively asked them if they want to ask for leave.
　　 Then, even if he usually strokes the water, Teacher Wei will definitely open one eye and close the other.
　　 Instead of taking a few days off, it might be better to have a few weeks of relaxed external environment.
　　 Besides, after this AM job was voted out, there are still a lot of leftovers left, which is also a piece of article.
　　……
　　 Back to the bedroom, Xu Qiu began to take stock of recent experiments:
　　 The synthesis experiment started in mid-August, and now in late October, more than two months, all experiments and article writing have been completed.
　　 Judging from the progress, it is quite fast.
　　 The main reason is that the experiment process is relatively smooth, and there is no big bottleneck. It is also better luck.
　　 And there is also the help of the simulation laboratory, plus basically working overtime every week, doing more than 996 work.
　　In this way, luck and hard work are indispensable.
　　 But Xu Qiu calmly said that in the field of scientific research, the former is still more important.
　　 The next finishing work will generally focus on the five systems of PBT4T and the three systems of Chen Wanqing.
　　 He remembered what the senior sister had asked him to help synthesize.
　　 It happened that his materials were consumed a lot after the first pass of characterization and device preparation, and needed to be refilled.
　　 This time, I don’t need to do the same as before, only dosing less than 200 mg of materials, you can do more, such as 500 mg.
　　 In this way, it can be used for a long time, but the requirements for operation are relatively high.
　　 In case of a waste of a pot of reaction, a few hundred dollars will be gone.
　　 In this regard, Xu Qiu is very confident in himself.
　　 Success after success, he is also a little bloated, as if he was born to do scientific research.
　　 However, he didn't swell for long, so he calmed down.
　　 Then, I began to think about new research directions.
　　 You can’t sit and eat, no matter how good the PBT4T system is, it is only a very small branch in the field of organic photovoltaics, and there are not many things that can be tapped.
　　 Moreover, it did not break out of the framework of its predecessors, and as a whole is still based on the traditional fullerene derivative system.
　　 But the highest efficiency of the devices in this system has been stuck at 10-12%, and it has not been changed for many years.
　　 may not be the future of the organic photovoltaic field.
　　 We still have to take a long-term view and see if we can make a bigger breakthrough and take a path of our own.
　　 Of course it will be difficult, but always try hard.
　　 What if it will happen?
　　……
　　 On Saturday, Xu Qiu sorted out some recent review articles in the field of organic photovoltaics and began to analyze:
In 　　 organic solar cell systems, the half-value width of the light absorption range of the polymer donor material is generally about 200-300 nanometers.
　　The acceptor material is mostly fullerene derivative PCBM, which hardly absorbs light above 400 nanometers.
"It can be approximated that the effective layer of organic photovoltaics can only absorb light with a width in the range of 200-300 nanometers, for example, 400-650 nanometers, or 500-800 nanometers.
　　 The visible light wavelength range is 390-780 nanometers, and the solar spectrum that reaches the ground has a larger range, at 295-2500 nanometers.
　　 Therefore, there is a fatal problem in the traditional system based on fullerene derivatives.
　　 That is, the light absorption range of the effective layer is too narrow to cover the entire solar spectrum.
Most of the sunlight penetrates the effective layer, the transmission loss is very large, and the upper limit of the photoelectric conversion efficiency is very low~EbookFREE.me~ Like an inorganic silicon solar cell with better performance, its light absorption range is very wide. Good light absorption in 300-1000 nanometers.
　　In its essence, it is a fullerene derivative of the acceptor material, which hardly absorbs visible light, but has a firm foothold with excellent electron mobility.
　　 Researchers have also discovered this problem very early, and have been looking for alternatives to fullerenes.
　　 Unfortunately, more than 20 years have passed, and there is still no material that can replace fullerene.
　　 Before returning to China, Mr. Wei mainly studied the perylene diimide PDI system, which is a substitute for fullerene.
　　 At present, its blending system with PTB7-TH has a maximum efficiency of less than 8%.
　　In addition, researchers have also developed polymer receptors, N2200, and other small molecule receptors with A-D-A structure.
　　 However, there is no way to reach the 8% threshold, let alone 10%.
　　 To achieve commercial applications, the photoelectric conversion efficiency in the laboratory must be at least 15%.
　　This has also led to the current decline in the field of organic photovoltaics, and the popularity has retreated to the second line, gradually being surpassed by rookie perovskite materials.
　　 If it were not for the PTB7-TH discovered in recent years, the maximum efficiency would be increased to about 12%, which would save the life of organic photovoltaics and it would be even cooler.
　　 Xu Qiu also learned about this after entering the research group and reading a lot of literature.
　　I knew that, would it be better to choose perovskite?
　　 Maybe, Xu Qiu didn't struggle for long.
They come, the security.
　　 is not yet to shrink back.
　　 There is no way in front of you, so find a way out.