I Have a Research Support System

The speed of the old driver is indeed relatively fast. After the taxi enters the elevated, it basically keeps driving at a high speed near the speed limit throughout the whole process, and occasionally exceeds the speed slightly.

If a motor vehicle exceeds 10% of the speed limit, although it is considered speeding, fines and points will not be deducted generally. Of course, if caught by the traffic police, it will also be criticized and educated.

If you are in a hurry now, naturally you have to make good use of the 10% space.

In the end, it took a total of more than 40 minutes, and the old driver ran from Pudong Airport to Hongqiao Airport.

At this time, Xu Qiu was still 50 minutes away from boarding the plane, theoretically, there should be enough time.

Xu Qiu hurriedly paid the fare, thanked the driver, and then ran towards the entrance of the domestic departure floor of T2 terminal of Hongqiao Airport.

Although he was very chic when paying, Xu Qiu was still very sad when he thought about the fare thrown away.

Taxis in Shanghai are already expensive. The normal starting price in the urban area is 14 yuan for 3 kilometers, and an additional 2.5 yuan per kilometer after 3 kilometers. For example, taking a taxi from Handan campus to Zhangjiang campus costs 50+.

For taxis in Xu Qiu’s hometown, the starting fare is 5 yuan for 2 kilometers, and an additional 1.5 yuan per kilometer for the next 2-6 kilometers (including 6 kilometers), and 2 yuan per kilometer for more than 6 kilometers. Basically already able to run from one end of the city to the other.

Now this "black car" costs 7 yuan per kilometer, and the final calculated fare is 364 yuan. This price is almost the same as a sleeper train ticket to go home.

However, this is all chosen by oneself, one is willing to fight and the other is willing to suffer, there is no way.

In addition, Xu Qiu noticed that the driver also had a watch and could issue invoices. He didn't know how the driver worked. Could it be that the taxis at the airport can set their own prices?

Xu Qiu walked into the entrance of the airport and first accepted the explosion-proof inspection by the guards.

The guards took something like a test strip and stuck it to everyone's clothes, then put it into the instrument and checked it.

General explosives contain nitrogen atoms in their molecular structure, such as nitro or azide structures.

The airport explosion-proof detection is usually to convert these common explosive molecules into ions, and then carry out trace ion detection.

Probably because the test strips are more expensive, and the country is relatively safe, and usually no one will bring a bomb on the plane, so a group of people usually use a test strip to test together, and then let them go if there is no problem.

After being delayed here for half a minute, Xu Qiu entered the departure hall of the airport and began to look for the check-in counter.

After five minutes of searching, Xu Qiu finally found the Ruyi Airlines counter in a corner.

He also ignored the question about the itinerary, and went directly to the self-service ticket machine to print the boarding pass.

After scanning the ID card, Xu Qiu read the prohibited/restricted dangerous items, such as liquids, lithium batteries, etc., and then selected the seat number.

Because of the late arrival, the seats in the front row by the window or by the corridor have already been selected, leaving only the middle seat in the back row.

Xu Qiu randomly clicked on a 48J and chose to print the boarding pass.

Next, Xu Qiu checked the information on the boarding pass while moving towards the security check entrance:

The flight number is RY1733, the boarding gate is C1, the scheduled departure time is 1930, the scheduled arrival time is 2240, and the current time is 18:50.

"Fortunately, I caught up." Xu Qiu breathed a sigh of relief. Generally, the plane will stop checking in 30 minutes before takeoff. If you don't print out your boarding pass before then, you won't be able to go through the check-in procedures. It will be counted as a missed flight .

However, you can't take it lightly now, after all, you haven't sat on the plane seat yet.

Xu Qiu quickly ran to the next stop - the security check.

There were not many people here, and after waiting in line for about six or seven minutes, it was finally his turn.

According to the instructions, Xu Qiu took out the computer, charger, and mobile phone from his backpack, took out his wallet, ID card, boarding pass, and other materials, and took off his coat, and began to undergo security checks.

There are two security check channels, one male and one female, two security inspectors.

Next door to the security check was a man who looked like Maimaiti. The man seemed to have received special care from the airport security staff. He was touched from head to toe and touched twice. After repeated confirmation, he was released.

On Xu Qiu's side, the security inspectors didn't check very carefully and let it go. Maybe it's because he is more friendly?

Passing the security check smoothly, Xu Qiu put on his coat, put on his backpack, held his boarding pass and ID card in his hand, and began to look for his C1 boarding gate.

I looked at the surrounding signs, good guy, my boarding gate is at the innermost part of the airport.

Who makes his own flight a small airline, what can he do.

Xu Qiu ran quickly, and finally arrived at C1 boarding gate 7 minutes later.

I have to say that this airport is indeed very big, if you come here on foot, it may take a quarter of an hour to walk.

At this time, Xu Qiu found that there was no long queue in front of the C1 boarding gate as he thought, but an empty one.

Looking at the seat next to him, it was full of people, and he thought something was wrong in his heart.

Soon, the airport voice broadcast sounded: "...Passengers, please note: We regret to inform that your flight RY1733 cannot take off on time due to: air traffic control reasons, and the takeoff time is to be determined. We hereby express our deep apologies, please You are resting in the departure hall and waiting for the notification. If you have any request, please contact the service desk staff. Thank you!"

"Ladies and Gentlemen, May I have your attention, please? We regret to announce that Flight RY1733...three grams of oil!"

Sure enough, it was delayed...

Xu Qiu took out his mobile phone, checked the information of flight RY1733 on Ctrip, and found that the average delay time of this flight in history is 1 hour and 17 minutes...

Looking at the flight situation today, there is currently a 37% probability of a delay of less than 1 hour, a 55% probability of a delay of 1-2 hours, and an 8% probability of a delay of more than 2 hours...

Then I looked at the scores given by the passengers to the flight. The full score is 5 points. This flight only scored 2.8 points, which failed...

Xu Qiu didn't pay too much attention to these things that he couldn't change. Instead, he found a place to sit down and checked the messages from Han Jiaying and his parents. He was worried about missing the flight, so he didn't have time to reply.

Seeing that they were all asking "Did you get on the plane?", "When will it take off?", Xu Qiu replied one by one, and didn't mention the matter of going to the wrong airport. Don't go too early when picking up the plane. After the plane takes off, plan according to the actual take-off time.

After a boring hour in the terminal, it was finally time to board the plane.

Scan boarding pass...

Walk up the boarding bridge...

Arriving at the nose of the plane...

The average-looking flight attendants shouted "Welcome aboard"...

Received a bottle of 330ml Tang master mineral water...

Find your spot, store your backpack, sit down, buckle up...

The two passengers in the same row as Xu Qiu:

The one next to the window on the inside is a young beauty in fashionable clothes, wearing sunglasses, leaning on a pink U-shaped pillow, with a bluetooth headset plugged into her ear, and smelling a faint scent of perfume...

On the outside is a middle-aged uncle, wearing a gold watch of unknown brand, and holding a newspaper in his hand...

The flight attendant introduced how to use seat belts, and how to escape in case of emergency...

As the plane headed to the runway, Xu Qiu reported the safety of the junior girl and her family, and then turned on the flight mode...

drop……

A violent push back...

The plane took off successfully at 20:31...

Xu Qiu looked past the young beauty, and could see outside the plane window, the brightly lit magic city at night drifting away from her...

The average-looking stewardesses delivered meals, including a pack of salt-baked peanuts, a pack of Shaqima, a pack of biscuits, and a pack of strange-flavored broad beans...

Fortunately, Xu Qiu ate at four o'clock in the afternoon. Otherwise, if he expected this kind of plane meal, he would have to go home hungry. Now he can fill his stomach and eat supper at home...

zzzZZZ...

The plane landed smoothly at 23:08...

Turning off the airplane mode of the phone, Xu Qiu sent a message to his parents "the plane has landed", and queued up to leave the plane...

A gust of cold wind hit, Xu Qiu tightened his collar, put his hands in his pockets, and didn't dare to play with his phone...

He just checked, and the temperature outside at this time is minus sixteen degrees Celsius...

Xu Qiu, who has adapted to the winter rhythm of the magic capital, was successfully broken...

Because there was no checked luggage, Xu Qiu directly chose to leave the station...

The small airport is also beneficial. From getting off the plane to leaving the station, it only took less than three minutes to arrive at the arrival floor...

"Where's the person?" Xu Qiu looked around, searching for traces of his parents, but he couldn't find them.

His heart skipped a beat, thinking that although his flight took off an hour late, the landing time was only delayed by half an hour.

This can also be regarded as the unspoken rule of the airlines. Generally, the flight time is expected to be 3 hours, but the actual flight time is usually only two and a half hours. It is probably from a psychological level to comfort passengers as much as possible—look, although we are delayed It took half an hour, but we arrived on time.

It would be embarrassing if the parents calculated the landing time based on the actual takeoff time and the estimated flight time...

At this time, the phone vibrated, and Xu Qiu clicked on it. It was a WeChat message: "We landed so soon. We set off half an hour earlier. We have just arrived at the airport, and we will pick you up right away."

"Okay, okay." Xu Qiu also replied in his native dialect.

Xu Qiu usually communicates with classmates and teachers at school, usually in words.

As for the parents in my hometown, they are not good at typing, and some use the handwriting input method, so they are more accustomed to using voice to communicate.

...

finally arrived at home.

Xu Qiu looked at the mutton soup, hand-meat, stewed mutton, braised mutton, mutton scorpions, mutton buns on the table... and began to eat.

Really good...

"Fat three catties every festive season" is really true.

In the next few days, Xu Qiu contacted a few friends from his hometown and went out to exchange ideas.

These friends are friendships established by the parents' generation and passed on to the second generation, so the relationship is not so easy to break.

Like junior high school and high school classmates, Xu Qiu basically has no contact with them, because there is no bond to maintain the relationship.

Of course, if it is a group of students who the university chooses to stay in the province, they will have more contact with each other. After all, they can often see each other, and they may be able to help each other in the future.

The devil is used to it, and every time he returns to the small fifth-tier city in his hometown, Xu Qiu will feel a sense of alienation, or a sense of alienation.

Because of the way of life between the two cities, the pace of life is very different.

It can be considered as two extremes, the first-tier cities are the most "curious", and the fifth-tier cities are the most "uncurious".

In the fifth-tier cities, people do not have too much pressure in life, and they tend to be Buddhist. There are not many high-paying industries here, and the ceiling is too low.

In fact, the meaning of hard work is not very big. It is nothing more than the difference between a salary of two thousand, three thousand or four thousand.

Therefore, everyone chose to lie flat and live a simple life, with a monthly salary of around 2,000 to 3,000.

If you are hungry, you will definitely not die from hunger. The housing price is around 5,000, which basically cannot rise, and many families have their own land to build a house to live in.

Buses usually close at six o'clock in the evening, because at this time, most people have already left work.

And the subway in Shanghai will be open until close to twelve o'clock in the evening. At six o'clock in the evening, the nightlife in Shanghai has not yet started, because the white-collar workers are still off work.

In addition, there are no entertainment activities in my hometown, like Xu Qiu going out with friends, just eating, drinking, and KTV. , Chamber of Secrets, and VR.

The lack of recreational activities will also cause some social phenomena to appear.

For example, when the live broadcast industry became popular, middle-aged men in many counties were "successful" and paid a lot of money to young female anchors.

In fact, it's easy to understand that they don't have access to women of this level at all, even if they go to that kind of informal health care store, what they see is crooked melons and cracked dates.

After all, in the profession of "Miss", they work wherever they are, and those who have the conditions will definitely choose to find opportunities in the first and second tiers. The expected income is higher, so what is left for the fifth-tier cities must be crooked.

But the Internet is different, almost all of them are "fairies\

,"When middle-aged men in the county meet these "fairies", there will be a certain probability that they will not be able to control their XX and wallet.

In addition, the cost of living in the county is very low. Many middle-aged men, especially those who don’t play cards, smoke, or drink, have money and can’t spend it. They always have some spare money and their jobs are stable. There is no pursuit of money.

However, a "big brother" from the "fairy" can give them great satisfaction, so it is not surprising that they directly throw out thousands or tens of thousands just for a "big brother".

Xu Qiu and his friends communicated with each other for several days, and then started to carry out experiments.

After all, this winter vacation has a month, and it can't be completely wasted.

Moreover, with the help of the system, this month can completely match a year in reality.

Now that the stacked device has made a breakthrough, it can be regarded as a perfect ending for the ITIC series of receptors. Xu Qiu plans to continue to develop the Y series of receptors.

Previously, the molecular structures of Y1-Y4 materials were relatively similar, and the central DAD unit was exactly the same, based on the NT unit as the A unit, and two TT units on both sides as the D unit.

The only difference between them is the terminal group, Y1 uses ICIN, and Y2-Y4 use ICIN derivatives.

Among them, Y3 material with the best performance uses ICIN-2Cl as the terminal group.

Although Xu Qiu focused on stacked devices before, the computing power allocated to the Y-series receptors was relatively small, but because the exploration time was long enough, he has now found a suitable path and obtained a high-performance Y-series receptors. Xu Qiu named it Y12.

In fact, from the perspective of molecular structure, Y12 has not changed much compared with Y3, that is, the NT unit with a side chain in the central DAD unit has been replaced with a BT unit without a side chain, and at the same time, the original TT unit without a side chain The side chain is introduced into the unit to supplement the solubility, and the end group is ICIN-2F.

As for why this material is named Y12, it is mainly because Wu Shengnan has named several materials she synthesized as Y5, Y6, and Y7.

Xu Qiu didn't intend to compete with her, so he directly named them from Y11 and Y12.

Just can also be distinguished: the central DAD units of Y1-Y7 are all based on NT, while Y11 and Y12 are all based on BT.

The only difference between Y11 and Y12 is that the terminal group used by the former is ICIN, while the latter is ICIN-2F.

In the end, the device based on J4:Y12 has the highest efficiency of 16.11%, which is a great breakthrough compared to the 14.8% of the previous J4:Y3 system.

Although the efficiency of stacked devices has reached a maximum of 17.3%, if a single junction can also reach 17%, or even 18%, it is also a CNS-level work.

It is very difficult for researchers to publish an article in a journal of the level of CNS without reaching this threshold.

However, once this threshold is crossed, the difficulty of publishing CNS is actually not that great.

Especially when Xu Qiu has reached the forefront of the field of organic photovoltaics and can still be used.

Xu Qiu basically knows what kinds of achievements can reach this CNS level. He just needs to keep working hard in that direction.

After getting the Y12 material, Xu Qiu simultaneously carried out various characterizations to analyze why it is better than the previous Y3 material.

For materials science, it is still very difficult to predict the quality of a material through its molecular structure before starting the experiment.

For example, the Y12 material that Xu Qiu obtained, behind its success, there are actually dozens of failed materials.

These materials are all materials that Xu Qiu had previously predicted that they might have higher performance, but the actual results were not ideal.

In a sense, this kind of applied discipline still has some "metaphysical" elements in it, and it is often necessary to tell stories to others.

For example, after getting a good result, go back and look at its molecular structure, and combine various characterization methods to explain why this material is good, which is actually a kind of "metaphysics".

But a story has to be told.

Because when "metaphysics" stories are told too much, most people agree with them, and the results of other structures can be predicted, "metaphysics" will evolve into "science".

In order to explain the reasons for the improvement of device performance, Xu Qiu compared the two systems of Y12 and Y3 mainly through DFT simulation, light source GIWAXS, and TEM transmission electron microscope.

It was found that compared with Y3, the molecular structure of the main chain of Y12 was only slightly changed, mainly because of the change in the position of the side chain, which made the molecular stacking between receptor molecules better, which in turn facilitated the transport of charges.

Because the molecular structures of Y3 and Y12 are similar, the synthesis of Y12 is also similar to the previous synthesis of Y3, which also requires six steps of reaction.

In the first step, a dibromo-substituted benzothiadiazole (BT) unit with an ethylhexyl side chain on the nitrogen atom connects two Nitro, to obtain BT units substituted by dibromo and dinitro groups.

In the second step, the BT unit substituted by dibromo and dinitro groups and the TT unit substituted by single trimethyltin with side chains are reacted to obtain the structure of TT-BT-TT, wherein two nitro groups are connected to BT, TT There is a linear alkyl side chain at the distal end.

The third step is to reduce the nitro group in the TT-BT-TT molecule and form a ring with the adjacent TT unit to form a cyclic secondary amine to obtain a continuous fused ring structure. At this time, there is a secondary amine located between TT-BT in the product, and there is a residual hydrogen atom on it, which is a reaction site.

In the fourth step, react the reactants of the third step with brominated alkanes, replace the hydrogen atoms on the secondary amines with alkyl groups to form tertiary amines, realize the purpose of introducing side chains on N atoms, and obtain the final central DAD unit.

In the fifth step, the aldylation reaction of the central DAD unit connects two aldehyde groups at both ends of the central DAD unit.

In the sixth step, the aldylated DAD unit reacts with the A unit ICIN-2F to obtain Y12.

Xu Qiu began to think about the next optimization direction.

Before he changed the molecular structure based on Y3, he tried dozens of methods, and found that the larger the change, the worse the final performance.

Small changes like Y11 and Y12 have improved performance.

Maybe this is the reason why rice mobile phones spent 200W to replace the LOGO, but the result was just "adding a line of code" to change from square to round.

When we strive for excellence, we cannot change too much, because once we change too much, it will become another new thing.

And if the performance expectations of new and old things follow a normal distribution, when the original has been relatively top-notch, then the new things will most likely become worse.

After some thinking, Xu Qiu finally decided not to "make a big move" on Y12, that is, not to change the main chain for the time being, and only modify the side chain and end group.

On the one hand, the terminal group is a relatively conventional optimization method. It was found that the introduction of methyl groups, fluorine atoms, and chlorine atoms will affect the performance of the device. Now Y12 adopts the structure of introducing fluorine atoms, which may be replaced by other terminal groups. The performance is still good. will improve.

On the other hand, although the main chain of the non-fullerene acceptor is mainly responsible for light absorption, the importance of the side chain is also very high, because the side chain can change the solubility and crystallinity of the material, and then change the shape of the blend film. The morphology affects the charge transport and the final device performance.

At the same time, when I moved before, although I confirmed that the evaporation equipment was functioning well, I was not sure whether the optimal evaporation conditions had changed.

Therefore, before Xu Qiu left Shanghai, he also made a copy of the evaporation equipment in Jiangwan's glove box, and now he is also using standard devices to simultaneously explore the optimal evaporation conditions.