I Have a Research Support System

After obtaining the 15% efficiency data, Xu Qiu began to plan the optimization direction of the next stacked device.

In the current optimal system, the effective layer of the bottom cell is the ternary J4:PCBM:IDIC-4F system, and the effective layer of the top cell is the binary PCE10:IEICO-4F system.

Considering the failure of the Y series receptors on the laminated device, Xu Qiu is also thinking whether the IDIC-4F is also a bit too perfect, which squeezes the space of the top battery and reduces the cost of the entire laminated device. upper limit.

After all, when the initial screening of the effective layer materials for stacked devices was carried out, the reason why the IDIC-4F system was selected was mainly because its efficiency was high enough.

In the later process of exploration, Xu Qiu did not change the material of the active layer much, and has been using the IDIC-4F system.

In addition to the introduction of PCBM with the ternary strategy, basically it is mainly related to the optimization of the transport layer, reducing light loss as much as possible, improving the charge transport effect, and so on.

Therefore, the optimization of processing technology at this stage can be said to be relatively complete.

If you want to make further breakthroughs, you still need to make a reasonable choice of effective layer materials.

Therefore, Xu Qiu made a decision to shift the focus of optimization of stacked devices to material selection again.

On the one hand, when selecting materials for the top cell and the bottom cell, the level of consideration can be broader, and the initial efficiency of the binary system should not be used as the main reference standard.

Instead, it mainly considers the adaptation of light absorption, so that the top cell and the bottom cell can perform their respective duties. The top cell mainly absorbs short-wavelength light, and the bottom cell mainly absorbs long-wavelength light.

On the other hand, Xu Qiu intends to broaden the range of material choices, facing the entire field of organic photovoltaics, not just the materials developed by his own team.

With the development of ITIC, other research groups have also developed many excellent donor and acceptor materials in the past six months. If appropriate, they can also be used directly.

Especially with regard to the selection of near-infrared non-fullerene acceptors for the bottom battery, Xu Qiu is not very satisfied with the IEICO series of the senior sister, and the FN-4F developed by the postdoctoral senior sister.

These materials do not have much problem in terms of efficiency, they are all 12% systems.

However, their device performance is greatly affected by the film thickness of the effective layer. Once the thickness deviates too far from the optimal film thickness, the device efficiency will fluctuate greatly. For example, if the thickness is 300 nanometers, the device efficiency may be directly cut in half. up.

In stacked devices, because the short-circuit current density of the top cell and the bottom cell needs to be adjusted, it is necessary for the effective layer to be less sensitive to changes in film thickness.

For example, IDIC series materials are a good choice. The film thickness ranges from 100 nanometers to 300 nanometers, and the device performance itself does not change much.

During this period, Xu Qiu also selected materials from several other research groups and synthesized them in the simulated laboratory with reference to their articles.

The reason why I don’t buy it directly is because at this stage, besides Xu Qiu’s ITIC, IDIC, IEICO series, and Xu Zhenghong’s IDTBR series of non-fullerene materials are relatively dominant in the market, the materials developed by other research groups Basically, there are no commercial channels.

Even if you want to buy it, you have to find an optoelectronic company to order it, and you can buy it in large quantities of 5 grams or 10 grams.

Because materials are time-sensitive, new and better materials may be developed in a few days.

If an old material has no characteristics, it will most likely not be sold after the new material comes out.

Although ITIC, IEICO, and IDTBR series are early materials, because they appeared early enough, they have now become standard materials.

Many research groups that are unable to independently develop new materials will buy standard sample materials to do leftover work such as ternary and stability.

Therefore, there is no need to worry about selling standard materials, which is why Xu Qiu asked Blue River Optoelectronics to give priority to ITIC and IEICO when it first started stocking up.

In addition, it is easy to understand that the IDIC series is easy to sell. After all, it is the material with the best performance at this stage.

Among the materials developed by other research groups, Xu Qiu noticed that the latest report, a non-fullerene acceptor material called COi8DFIC, is quite interesting and has been included in his focus.

The molecular structure of COi8DFIC is somewhat similar to the DBC-IC reported in the NC article by Zhenghong Xu's group.

The central D unit also adopts a non-completely conjugated fused ring structure. The three TT units are first connected by a carbon-carbon single bond. At the two connections, an oxygen atom and a carbon atom are respectively extended, and the surrounding two The TT units form a non-conjugated six-membered ring, the carbon atoms on the six-membered ring are sp3 hybridized, and two side chains can be introduced.

The terminal A unit uses the ICIN-2F unit developed by Xu Qiu and his colleagues.

This material was developed by Li Dan's research group at the National Center for Nanoscale Science and Technology.

They continuously reported two systems, namely the binary PCE10:COi8DFIC system and the ternary PCE10:COi8DFIC:PCBM system, with device efficiencies of 12.16% and 12.77%, respectively.

Both articles were published in the Sci. Bull. journal, which is a journal recommended by the whole country mentioned above.

Xu Qiu speculates that the fact that they published their work here may also be due to the completion of the above task.

Of course, they also received a wave of bonuses, and later Sci. Bull. became a comprehensive category.

Moreover, these two articles are very short, and the format of their publication is "Short Communication (short communication)".

Originally, compared to articles in the normal Article format, Communication is short enough, usually about 3,000 words, and looks like three to five pictures.

Now this Short Communication is even more exaggerated. The text is only two and a half pages, and the full text is just one picture, integrating molecular structure, light absorption spectrum, fluorescence spectrum, J-V characteristic curve and EQE curve.

However, the experimental workload is actually not too much, because other characterization tests have also been done, including light source GIWAXS, electron microscope TEM, AFM, and charge mobility SCLC, but they are only placed in the supporting information, which contains enough At least 20 pictures.

Of course, it doesn't matter to Xu Qiu whether the article is short or not.

He mainly focused on three points, that is, the COi8DFIC system has the characteristics of "ultra-narrow band gap", "high current density" and "insensitive to film thickness".

The band gap of COi8DFIC is only 1.26 electron volts, and the light absorption band edge can reach 1000 nanometers, which is already close to the band gap of silicon. At room temperature, the band gap of intrinsic semiconductor silicon is 1.12 electron volts.

Therefore, the device based on the COi8DFIC binary system has a short-circuit current density as high as 26 mA per square centimeter, and the ternary system has reached 28 mA per square centimeter, which is higher than the Y series receptors that Xu Qiu has obtained at this stage. exaggerate.

Of course, the high short-circuit current density also comes at a price, that is, the open-circuit voltage is low, only 0.68 volts.

Otherwise, if this current density is matched with an open-circuit voltage above 0.8 volts, the research group that breaks the current world record is not Xu Qiu, but Li Dan's research group.

At the same time, COi8DFIC also takes into account the advantages of the IDIC series, and when preparing thick film devices, the attenuation of device performance is small.

Therefore, Xu Qiu preliminarily judged that this material may be a superior substitute for near-infrared receptor materials such as IEICO-4F, and it is worth trying.

Sunday.

Because of working overtime on Saturday, Xu Qiu slept until noon.

He took out his phone, intending to check the time, but found that WeChat seemed to be bombed, full of unread messages, and a missed call from Wei Xingsi.

No wonder Xu Qiu always felt his surroundings vibrate in his sleep. It turned out that it was not an illusion, but the phone was vibrating.

He first glanced at Mr. Wei's call record, it was nine o'clock in the morning, and he hung up after the 7th ring, and there was no second call.

Generally, under such circumstances, it is not an important matter. It may just be that Wei Xingsi suddenly had a scientific research idea and wanted to share it with Xu Qiu.

Therefore, Xu Qiu didn't call back. Anyway, we will meet in the afternoon, and we can communicate with each other face to face.

Most of the WeChat messages are from postgraduate students in the school, including Tao Yan, Mu Xue, etc., as well as Mo Wenlin and Han Jiaying in the research group. In addition, there are even a few old classmates who have not been in touch for a long time. Also sent a message.

Xu Qiu casually clicked on the top few messages to check, and found that they were all talking about the same thing, with a forwarded link attached.

The link is a tweet from the Onion Club of Shanghai Comprehensive University: "The legendary direct Ph.

Seeing the title, Xu Qiu already guessed that he should be the main character, probably because the incident at Tuesday's meeting further escalated.

Xu Qiu knew a little bit about the Onion Club in school. He had encountered it when he was recruiting new members from the "Hundred Regiments War", but he didn't pay much attention to it. He just knew that it was named after the Onion News.

The Onion News is a satirical news organization in the beautiful country, which features satirical articles covering domestic, foreign and local news, as well as entertainment newspapers and websites under its umbrella.

The news provided by Onion News is usually fabricated fake news based on real news events.

Although many of the stories are false, they are by no means fabricated. Instead, they use exaggerated imagination to express their perception of the world. It is an alternative social commentary, so it is sought after by many readers.

Moreover, it imitates the characteristics of traditional news. All news is reported according to the standards of the United News Agency of the beautiful country, which seems to be quite similar.

Because it was relatively successful, when the circulation of traditional print media was reduced and staff were forced to lay off, the sales of "The Onion" were not greatly affected.

Xu Qiu opened the link of the article, and as expected, he saw the photo of himself berating Fang Qiu at the meeting at first glance, and it has not been coded yet...

After checking the text, Xu Qiu found that the content was quite normal, without too much embellishment in it.

However, there was not much mention about the interaction between Xu Qiu and Mu Xue, only a sentence was mentioned at the end of the article, which barely echoed the title.

Most of the content is about Xu Qiu’s achievements, including directly receiving a national scholarship as a direct Ph. There are more than 30 articles in total, more than ten articles written by one SCI district and one author, etc...

In addition, the text also mentioned Shanghai University many times, saying that "Xu Qiu is an undergraduate student in the Department of Materials Science and Engineering of Shanghai University, and has a direct Ph.D. in the Department of Materials after graduation."

Not only that, Xu Qiu took a closer look at the photo taken, and there was also a very clear logo of Shanghai University in the projection screen above.

"The title seems to be UC shocking, but if you look at the text carefully, it looks like a soft article?" Xu Qiu couldn't help thinking: "Maybe I was selected by the school as a model to establish an image of a strong scientific researcher. How about raising the school's reputation?"

This is possible. In addition to their hard power, colleges and universities also need to improve their soft power through continuous publicity and public opinion.

Maybe someone had originally planned to go to Qingbei University because of seeing this tweet, but then came to Shanghai Comprehensive University to follow in Xu Qiu's footsteps.

After all, young people are easily impulsive.

Looking at the current situation, if only a small society in the school was behind the scenes, it would be impossible to achieve such a large influence in such a short period of time.

Even old classmates who hadn't seen each other for many years were blown out.

Xu Qiu checked the news one by one.

Tao Yan came here to claim credit: "Thanks to me, Xu Qiu, you are famous!"

Xu Qiu thought for a moment, and sent Tao Yan a one-cent red envelope as "thank you".

Mu Xue sent a link to the Onion Club tweet, and added a string of ellipsis "...".

Xu Qiu also replied with "...". At that time, he just did it unintentionally. He didn't expect to have such a big impact. Fortunately, this tweet was not gossip, otherwise it would be really difficult to handle.

Mo Wenlin sent a message: "Now wechat groups and Moments are reposting this tweet from the Onion Society, and it has spread among college students. I first saw it in our Kainan University group. of."

Xu Qiu replied with a "surprised" emoji, and then went to check the circle of friends on WeChat.

Sure enough, now the entire circle of friends will be swamped by this article.

Han Jiaying also sent a link and said, "Brother, you are famous again~"

Xu Qiu replied with a "satisfied" emoji, and thought to himself, it's not the gossip news, otherwise the school girl would be blown up.

In addition, Niu Minmin, an old high school classmate who hadn't been in touch for many years, also sent a message to inquire about Xu Qiu's situation.

In high school, Niu Minmin, Jingwei, and Xu Qiu all entered school early, two or three years younger than other students who entered normally, and their grades were not bad, so they often played together.

Later, Niu Minmin went to Qingbei University, Jing Wei went to Jincheng University, and Xu Qiu came to Modu Comprehensive University. The three places were separated, and the contact was much less.

Later, Niu Minmin was studying for a master's degree at Qingbei University, and seemed to have plans to go abroad for a doctorate. Jing Wei chose to stay in Tianjin to work, and Xu Qiu went to the school for a doctorate. The three embarked on different paths.

After finally replying to everyone's messages, Xu Qiu lay on the bed and ordered a takeaway.

While waiting for the delivery, he glanced at the last issue of Onion News:

According to the Xinhua News Agency, once the news of the merger of Shanghai University of International Business and Economics and Shanghai School of Business and its renaming as "Madou University of Economics and Business" came out, it caused a series of chain reactions.

Relevant persons in charge, experts and scholars from major universities in Shanghai gathered at the Xingbake Cafe in Wujiaochang to discuss the matter of "renaming with me, starting from scratch", and opened a three-day group school merger and renaming meeting.

Representatives attending the meeting came from 47 colleges and universities, including Shanghai Comprehensive University, Shanghai Jiaotong University, Tongji University, Shanghai University of Finance and Economics, Shanghai University of Technology, Shanghai Shanghai University, etc. The gathering of representatives from universities is like celebrating the New Year .

The meeting first proposed that in order to build a blueprint plan for cooperation between Shanghai Finance and all walks of life, Shanghai Shanghai University of Finance and Economics and Shanghai Jiaotong University can try to merge.

After the merger, the name was changed to Shanghai University of Finance and Economics.

In response to the new school name of Jiaocai University, a conference representative from Magic Academy in Shanghai said: Jiaocai means paying money, and this name is unlucky.

Comrade Chen Erxiu, the representative of the Shanghai University of Finance and Economics, agreed and suggested that Shanghai University of Finance and Economics could consider merging with Shanghai University of Finance and Economics (formerly known as Fudan University), and the merged name would be changed to Shanghai University of Fortune.

This opinion was unanimously nodded and praised by the representatives present.

They all said that this renaming plan can be called a renaming that will be recorded in history. This move will undoubtedly lead to a tsunami-level shock in the financial circle of Shanghai, and the symbol of Shanghai as the financial center of the country will become more obvious.

Shanghai Metropolitan University of Technology said that there are more and more exchanges between finance and economics colleges and us, and it may also consider merging the University of Finance and Economics and Magic Science and changing its name to Shanghai Metropolitan University of Finance and Economics.

This speech was also nodded by the representatives present.

The representative of Shanghai University of Finance and Economics said in the meeting that everyone is deeply honored by our school's love and respect, but under the guidance of our school motto "Thousands of Virtue and Knowledge, Economy and Times", I hope everyone here can think carefully.

Ma Yiduo, representative of Modu Code University, suggested that Modu University of Technology has reason to merge with Tongji University, because after changing its name to Modu Jigong University, it is a form of paying tribute to Jigong, an eminent monk and living Buddha of the Southern Song Dynasty who planted flowers. The combination of science and theology can effectively inherit the traditional culture of flower growers.

At this time, the rock representative of the Magic City School of Music took a sip of cappuccino and proposed with a mouthful of white foam that the School of Electric Power in Shanghai City could consider merging with our school, so as to have the opportunity to form the University of Electronic Music in Shanghai City.

Not only is it a new attempt in the history of music, but after the establishment of the school, it will also have the opportunity to receive support and guidance from Teacher Junetian and others.

In addition, Modu Maritime University, Modu Ocean University, and Modu Customs College put forward a proposal at the same time, deciding to merge the three schools to form Modu Hi Hi Hi University.

At this point the meeting was here and the first ballot was held.

In the end, with 24 votes in favor, 20 against, and 3 abstentions, the decision to merge Shanghai University of Finance and Economics and Shanghai University of Finance and Economics and change its name to Shanghai Fortune University was passed.

After reading the tweets in the previous issue, Xu Qiu felt that compared to the tweets about himself in this issue, the articles in the previous issue were obviously more "onion-like".

He reckoned that he was probably chosen by a mysterious force, otherwise the Onion Society would not have published two articles with such different styles.

Reminiscent of the last Weibo hot search and almost hot list, there is a very high probability that there is a mysterious force behind it.

Of course, these are all Xu Qiu's guesses, and no one from the school has come to contact him now, so it's hard to say what the specific situation is.

But at least, this matter did not cause any harm to him, so Xu Qiu didn't care.

Being able to gain both fame and fortune is naturally excellent.

Xu Qiu wasn't disturbed by the tweets from the Onion Club. The focus of the researchers' work should be on research after all.

After eating lunch in the dormitory, Xu Qiu packed up the garbage, threw it into the trash can downstairs, and went to Caiyi as usual.

It is said that the Shanghai Metropolis will implement a garbage sorting system in the future, so we can no longer throw garbage at will like this.

This may also be the general trend.

At the earliest, in the 1990s, florists entered a period of rapid urbanization.

Everyone's eyes are focused on urban construction, and they don't pay much attention to problems such as garbage and sewage, as long as they can find a place to store garbage.

However, the speed of urbanization of flower growers is too fast, and people soon discovered that all the places around the city where garbage can be piled up have been piled up.

Not to mention wasting land, it also affects the environment and directly affects the economic benefits of the city, so the construction of landfills began.

The typical way is to find a suitable ravine in the outer suburbs of the city, do some anti-seepage treatment on the ravine, and then dump the garbage into the ditch.

Generally, such garbage dumps have a service life of more than ten to twenty years, but it is often found that the ditch has been filled in ten or a little more than ten years, and then the ditch will be sealed for greening or other purposes.

But in fact, this method only solves the problem of garbage storage. The leachate, biogas, and non-degradable garbage in the later stage are all problems, which are symptoms rather than root causes.

Moreover, the country's land is limited, and the method of landfilling with garbage has been used, and one day all the land will be filled.

To solve the problem of urban garbage, the ultimate solution is to classify the garbage.

At present, the country that has achieved the ultimate in garbage recycling in the world is the neon country.

Each of their residential quarters has several fixed large garbage stations.

The garbage station is a house surrounded by barbed wire. There are latches but no locks. People need to sort their own garbage into bags and send it to the recycling station.

Household garbage, books and newspapers and other small pieces of garbage should be placed in their corresponding rooms.

Bulky garbage such as furniture and home appliances are placed outside the house, and garbage tickets need to be purchased in advance.

The recycling bins are managed by special personnel, and before the garbage is transported away, they have to carefully classify and pick out the useful things.

The concept of "garbage needs to be sorted" is almost equivalent to the domestic concept of "no spitting and defecating anywhere".

If you do not sort garbage according to the regulations, you will face a high fine, and even a serious sentence of up to five years in prison.

Of course, no system is perfect.

The garbage sorting system of the Neon Country was also criticized by many people because it was too complicated and detailed, but at least the result was quite good.

If the country wants to implement a garbage classification system, it is foreseeable that various problems will definitely arise.

For young people who are more receptive to new things, it may be better to implement them.

The most difficult thing to deal with should be groups like Vegetable Aunts, who have been throwing garbage at random for decades, and wanting to change their lifestyles is not something that can be done in a short while.

Moreover, some aunts also have the skill of "you reason with me, and I play rogue with you", which is also more difficult to deal with.

Arriving at Caiyi 216, Xu Qiu greeted everyone.

The other small partners in the research team have already learned about Xu Qiu's appearance on the Onion News, but they are relatively calm.

After all, they are used to getting along with Xu Qiu day and night. After seeing the tweet, their thoughts were roughly: "Why is this person as good as Xu Qiu? Oh, it turns out to be Xu Qiu. That's okay."

Xu Qiu sat down in front of his seat and began to think about how to continue to optimize the performance of stacked devices today.

Although groping has already begun in the simulation laboratory, the time in reality cannot be wasted.

At this time, Xu Qiu suddenly remembered that the efficiency of the device broke through 15% on Saturday, and he had not notified others.

The school girl just went home this Saturday, so she didn't do the experiment with him;

Wei Xingsi stayed at 218 on Saturday afternoon, and Xu Qiu even went to him to get some newly printed documents. At the same time, he found that Mr. Wei was watching American dramas with a projector in the office, and Mr. Wei disappeared after dinner;

Senior sister Wu Feifei also came to 216 on Saturday afternoon. She left a courier, chatted with Xu Qiu, and left.

And Xu Qiu didn't get the efficiency data of 15.00% until after ten o'clock in the evening.

Just as Xu Qiu was thinking about how to announce this result to everyone and make everyone "happy", familiar footsteps sounded in the corridor.

Not long after, Wei Xingsi appeared at the door of 216. As soon as he met, he said to Xu Qiu: "Xu Qiu, how did the laminated device work yesterday?"

Last night, Wei Xingsi planned to ask about the situation after Xu Qiu's equipment was ready, but Fang Guangwu dragged him out for a drink. The dinner didn't end until after ten o'clock in the evening, and then he returned home and forgot about it , I just remembered this morning, and I thought about calling Xu Qiu to ask, but I didn't get through.

"The highest is 15.00%, which happens to be an integer." Xu Qiu replied calmly.

"!" As soon as the words fell, everyone looked towards Xu Qiu in unison, paying attention.

Mo Wenlin participated in the optimization process of stacked devices almost all the way, and she felt the most emotional in her heart:

About a month ago, he followed Xu Qiu's ideas to prepare stacked devices. At the beginning, he could only achieve about 10%, but now it has reached 15%.

It should be known that the upper limit of efficiency in the field of organic photovoltaics has not risen by 1% a year, and the average annual increase is almost 0.5%.

This 0.5% is still the result of the joint efforts of research groups in all related fields around the world.

Now, in just one year, the upper limit of efficiency in the field of organic photovoltaics has broken through from 12% to 15%.

The leap of 3 percentage points was almost all the credit of Xu Qiu alone.

Moreover, looking at this momentum, even 15% can't stop Xu Qiu's footsteps.

Wei Xingsi was also shocked. On Friday, Xu Qiu told him that he had achieved 14.5%. At that time, he was thinking: "Look at this posture, in another month, it is estimated that the efficiency may increase by 0.5%, and we can reach 15%. threshold."

Unexpectedly, it only took one day to break through.

Originally, Wei Xingsi thought that he already thought highly of Xu Qiu, but unexpectedly, he thought Xu Qiu too simply.

The law of increasing efficiency in the field of organic photovoltaics does not hold true for Xu Qiu.

Maybe, 16% next month?

He seemed to really see an article of "Nature" beckoning to him.

Wei Xingsi has also experienced a lot of turmoil in these years. Although the inner activities are very rich, there is no gaffe on his face, but his tone is still a little excited, and he asked: "Is the device structure drawing ready?"

Xu Qiu shook his head: "I haven't had time to draw a picture, so I'll draw one on the spot with a brush."

As soon as she finished speaking, Han Jiaying tacitly handed over an experiment notebook and a pen.

Xu Qiu took the pen and paper, turned to a new page in the experiment notebook, and while drawing the device structure, explained: "In the device structure used in the optimal system, the effective layer of the bottom battery is the ternary J4:PCBM:IDIC -4F system, the effective layer of the top battery is binary PCE10:IEICO-4F system, the middle transport layer is zinc oxide, M-PEDOT..."

Later, Xu Qiu repeated the further optimization method of stacked devices that he had thought of before: "The next direction of optimization is mainly in terms of materials. I plan to use materials from other research groups at the same time, including Li Dan's research project of the National Nano Science and Technology Center. The COi8DFIC developed by the group..."

Wei Xingsi nodded repeatedly. Originally, he wanted to make some suggestions, but after thinking for a long time, it seemed that there was nothing to add. Xu Qiu's optimization route and logic were very smooth.

Therefore, Wei Xingsi did not force Xu Qiu to increase the difficulty, and said: "Okay, just follow the current thinking... By the way, it is best for us to synthesize the COi8DFIC material ourselves, or find out if there is a channel to buy it."

In fact, with Wei Xingsi's current influence, it is possible to get some COi8DFIC materials from Li Dan's research group, but the price is that the article has to be named after the other party's name, and if it is synthesized by oneself or purchased commercially The material does not need to be named, only the corresponding literature needs to be cited.

"I understand," Xu Qiu added: "COi8DFIC is probably not available for purchase. This material has just come out, and it is relatively small, so we need to synthesize it ourselves."

"Hmm..." Wei Xing thought for a while and said, "How about this, Wu Shengnan, can you help synthesize COi8DFIC?"

"Okay, no problem." Wu Shengnan agreed very quickly.

Xu Qiu still doesn't know whether COi8DFIC is useful or not. The simulation laboratory is still synthesizing and has not got the materials. If the final result is not good, it will waste a lot of Wu Shengnan's time.

However, since none of the postdoctorate seniors had any objections, there was no need for him to object.

And Wu Shengnan's idea is very simple, now there is an opportunity for a second or third CNS article in front of her, do you want to cherish it? Of course.

In Xu Qiu's last article "Nature·Energy", because of her lack of contribution, she only got one of the fourth works. If the contribution of this article is enough, it would be very cool to get the second one.

For a top journal like CNS, even a second work is a great honor.

Like other journals, the second work is not often mentioned, but a second work in "Nature" also has a certain reputation.

Mo Wenlin has contributed a lot to the current layering work, and what she is doing now is to compete with Mo Wenlin for this second work.

PS: 8,000 words to update, set up a bowl to ask for a monthly pass...

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