Chapter 302: Harvest!

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At seven o'clock in the morning on Thursday morning in the bedroom.
Xu Qiu opened his eyes on time and looked at the other two bunks. Tao Yan's position was empty, with only one quilt. Now he should be alive in a corner of the earth, while Ren Bin is still screaming. sleep.
I calculated it in my mind, and after more than ten hours, the results of Simulation Lab II should have come out.
Thinking of this, Xu Qiuteng bounced off the bed, then went to the bathroom to wash his face, then lay back on the bed, rubbed his hands, and entered the simulation laboratory.
Sure enough, the device performance exploration of several new materials has been completed. At present, the simulation experiment personnel have started the second priority task arranged by Xu Qiu yesterday, and the synthesis experiment is in progress.
Xu Qiu was busy looking at the results of device performance.
The more you look at the results, the more pleasant you will be.
The highest efficiency reached 10.12%!
It is equivalent to the IDTBR system reported by Xu Zhenghong's group in Nature Materials, which was just published!
Xu Qiu couldn't help but start to imagine that if the current results could be obtained half a year or a year in advance, he and Mr. Wei's research group might publish this "Nature·Materials" article.
However, high probability will be more difficult.
The publication of such articles at the level of a major journal of "Nature" depends not only on the current work, but also on the previous work, and the bonus of the corresponding author will also play a very important role.
For example, before Xu Zhenghong's group published this "Nature·Materials", they pioneered the field of ADA and published a lot of research work. Although it can be understood as irrigation, it is not also promoting the development of this field. .
After all, in addition to the subversive discovery, such as the preparation of graphene with tape, most fields want to develop a little bit of grinding. What we see is the final IDTBR. In places that cannot be seen, there may be There are several other, dozens of unknown structures.
As for the corresponding author's bonus, it is also very understandable.
Because of the "peer review" mechanism, it is easier to pass articles by bigwigs, while ordinary scientific researchers have to work harder to get better results if they want to get ahead, such as this IDTBR work If you change to an ordinary scientific researcher to submit a manuscript, the most likely reviewer opinion is "recommendation to NC", and only one "Nature·Communication" can be published in the end. The grade will be short, unless the efficiency is 11%. , Or even 12%, have the chance to be on "Nature·Materials".
To say that this system is unfair, and indeed unfair, the bosses have privileges.
But there is no absolute fairness in this world, and maintaining relative fairness is already very difficult.
You know, before becoming big bosses, most big bosses also climbed up from ordinary scientific researchers step by step.
It’s not a torture from the soul:
The hard work of three generations of my family, why have you lost your ten years of hard work?
The principles are common.
On the other hand, the "Nature·Materials" published by Xu Zhenghong's group also affects the difficulty of publishing articles in the journals of "Nature" in the field of organic photovoltaic non-fullerenes.
A popular journal like this must take into account work in different fields. It is impossible to publish too many articles in the same field unless it is a hot field or a short-term continuous major breakthrough in a certain field.
And now Xu Qiu's 10% efficiency is a breakthrough, but not a major breakthrough.
Putting aside the distractions in his mind, Xu Qiu began to analyze the data carefully.
In any case, as a scientific researcher, the most important thing is to do your job well.
There are a total of thousands of device J-V data results. Just analyzing these complex data, Xu Qiu spent half an hour and got many conclusions:
First, the best system is H22: IDTT-ICIN, which has an efficiency of 10.12%. The original H22: IDT-ICIN system has an efficiency of 7.6%. This shows that the IDTT unit has improved photoelectric performance compared to the original IDT unit. less.
Xu Qiu immediately realized that IDTT-ICIN will be a very important standard system, and named IDTT-ICIN as ITIC. For the standard system, simpler names are better, such as PCE10, P3HT, PCE11, PCBM, etc. . A simple name makes it easy to be remembered by others, and it is easy to be recognized by colleagues.
In addition, the ITIC system is different from the 3D-PDI system. The optimal device processing conditions for this ADA molecule do not require post-annealing treatment or solvent additives. It only requires normal spraying, which is very simple and very " clean".
Moreover, the performance of the device produced by normal spin coating is about 2% lower than that of the device prepared by spraying method, which is only 8.33%. If others do not know the spraying technique, it will be more difficult to repeat this result.
Second, based on the structures of IDT-ICIN-4F4ClDM, compared with IDT-ICIN, the performance of -4F and -DM systems are improved, and the range is not small, from 6.22% to 8.92% and 8.06% respectively, and- The 4Cl system actually decreased slightly to 5.77%.
Third, the H3x system of the school girl, that is, after the introduction of fluorine atoms in the BDT unit, the performance of the device did not improve, but slightly decreased.
According to the existing literature, from a statistical point of view, the introduction of fluorine atoms in BDT has a probability of performance improvement of about 20%. Of course, the idea is that although this probability is not high, it is also worth trying. Now it is on the street and nothing The big deal.
Because even if it is a street material, combined with ITIC, the device performance is 8.72%, and finally it is no problem to take out an ACSAMI.
Fourth, the postdoctoral sister's FN-ICIN system, referred to as FNIC by Xu Qiu, has an efficiency of up to 9.64%. The optimal matching donor is the narrow band gap PCE10 instead of the wide band gap H22 series.
Xu Qiu concluded that the length of the molecular conjugation may be extended, and the light absorption range will shift to the near-infrared direction, so that it forms complementary light absorption with narrow band gap materials.
He let the simulation experimenters measure a light absorption spectrum and verified that the conjugate lengths of IDT-ICIN, ITIC, and FNIC are 5, 7, and 9, respectively, and the range of light absorption is roughly 550-750, 600-800, 650-850, that is, every time the conjugate length increases by 2, the light absorption is about 50 nanometers redshifted.
In addition to drawing four conclusions, Xu Qiu also came up with the next optimization direction.
The first priority is to synthesize IDTT-ICIN-4F, IDTT-ICIN-DM and FN-ICIN-4F, which he referred to as IT-4F, IT-DM and FN-4F respectively.
The second priority is to synthesize monofluoro, monomethyl substituted ICIN-F, ICIN-M units, and monochloro substituted structures are of little significance. By doing this, you can post articles and clarify the influence of the number of heteroatoms and methyl groups on the performance of the device~EbookFREE.me~ In many cases, although the change trend can be roughly guessed, the material is not synthesized and tested again. , That's just a guess.
The third priority, side chain modification, uses the side chain of thiophene and the side chain connected to the hexyl group at the meta position of the benzene ring to replace the side chain of the benzene ring connected to the hex group at the para position of the ITIC system.
It is different from the original sprint efficiency. At that time, it was a new structure, and how many standards it reached was almost the same grade of articles. For example, 8% is the second district and 10% is the first district.
Now for these new jobs, it is equivalent to the same structure. As long as the efficiency of the device remains above a certain value, it will not necessarily achieve efficiency breakthroughs every time. As long as the story is well told, good articles can be published. For example, top-level articles such as AM.
Of course, if you want to publish better articles, such as the main journal of "Nature" and the level of major journals, you still have to improve efficiency, at least to break the existing efficiency record.
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