Chapter 108: 1 foot at the door

　　 After returning to the dormitory to collect toiletries and a change of clothes, Xu Qiu took the school bus to the Zhangjiang campus.
　　 came to the A501 office of the Microelectronics Building, he locked the door and entered the simulation laboratory.
　　 After the system authority level is upgraded, the volume space inside the simulation laboratory is greatly expanded.
　　Moreover, he did some preparatory work in advance, copying several of Handan and Zhang Jiang's laboratories each for backup.
　　 Xu Qiu entered one of the synthesis laboratories and began to throw reactions.
　　 A total of five synthesis reactions, the target products are all the best performance P2FBT4T-2OD material, the reaction time is set to 8, 10, 12, 14 and 16 hours.
　　 The previous polymerization reaction time was only reduced from 24 hours to 12 hours, and it has not been finely controlled.
　　 After starting the quadruple acceleration, this time-consuming reaction can be completed quickly.
　　 It took a total of about eight hours. Xu Qiu successfully completed the polymerization and post-treatment of all products, and a total of five groups of products after Soxhlet extraction and drying in chloroform were obtained.
"According to the time involved in the polymerization reaction, Xu Qiu labeled them as P8, P10, P12, P14 and P16.
　　……
　　 On Saturday, Xu Qiu optimized the preparation process of battery devices based on these five materials in the simulation laboratory:
　　Solvents, chloroform, chlorobenzene, and dichlorobenzene.
　　 Donor/acceptor mass ratio, from 2:1 to 1:2.
　　Different solution concentration and speed.
　　Spin coating method, spraying method, ordinary spin coating method, thermal coating method.
　　 different thermal annealing temperature.
　　Different volume fraction of solvent additives.
　　 are all known, relatively conventional control methods.
　　 By Saturday night, Xu Qiu made eight batches of devices.
　　 Only two days have passed since the real time, but his actual experiment time has exceeded 60 hours, consuming more than 6000 system points.
　　 Although you can freely adjust the posture during the experiment in the simulation laboratory, you can sit or even lie down to do the experiment, the energy consumption is greatly reduced.
　　 But two consecutive days of experimentation still made him tired.
　　 is that he is young, his physical fitness is there, and he can hold it.
　　 Leaving the simulation laboratory, Xu Qiu found a nearby bliss on Dianping.com and ordered a horse to kill a chicken.
　　 Lie on the massage bed, Xu Qiu counts the harvest:
　　The optimal polymer system is P10, and the device efficiency is optimized to 9.70% by him. The specific experimental conditions are:
　　 The total concentration is 20 mg/ml, the donor/acceptor ratio is 1:1.5, the solvent is chloroform, the spraying method, the speed is 3000r.p.m., no solvent additives are added, and the thermal annealing is at 150 degrees Celsius for 10 minutes.
　　 This time, the best solvent is chloroform, but because of the low boiling point, the hot coating method of heating the solvent cannot be used.
Under the condition of chlorobenzene solvent, the solution is heated to 90 degrees Celsius. Using the previous thermal coating method, the efficiency is 9.48%, which is slightly inferior to chloroform solvent.
　　 In addition, the reaction time has little effect on the performance of the device, and the highest efficiency of P12 can reach 9.62%, and the conditions are similar to those of the P10 system.
　　Unfortunately, the final efficiency is stuck at 9.70%, which is not high.
　　 is still close to the door, can rush to 10%.
　　 Thinking of the experimental experience in these two days, Xu Qiu suddenly thought:
　　 It would be nice if someone in the simulation laboratory could help him with the experiment.
　　 So he asked:
　　 "The system, can you copy me into it and do experiments for me?"
　　 [The current authority level is insufficient. After the next advanced task is completed, similar functions can be achieved. 】
　　 Xu Qiu immediately came to the spirits. It was just a casual mention, but it was really OK.
　　 is to complete advanced tasks first to further increase the level of authority.
　　 However, as long as this result is not intercepted by other research groups, it is not a big problem to post a section one article, and the completion of the advanced task is just around the corner.
　　 He carefully recalled that after his previous proficiency in the four basic skills was raised to Tier 4, he was considered to have entered the road of scientific research.
　　The system unlocks two important functions, weekly tasks and simulation laboratory.
　　 If you can publish an SCI area one article this time, it can be considered a big step on the road of scientific research, and the system will unlock a new function again.
　　 To know the requirements of the school for the graduation of Ph.D., it is only a section.
　　 In fact, even at the Magic University, more than 90% of postgraduates cannot publish an article in one area.
　　……
　　 On Sunday afternoon, Xu Qiu returned to Handan campus.
　　 Chen Wanqing is helping him do some basic characterization of materials, mainly using the existing instruments in the laboratory to test the light absorption spectrum, fluorescence spectrum and cyclic voltammetry curve of the material.
　　 She started doing it on Friday, because he has more materials, there are five kinds in total, so she didn't finish it all in one day.
　　 These five materials include the original PBT4T molecule, and then the P2FBT4T molecule with four different branches.
　　 Today, Xu Qiu plans to make a batch of devices.
　　 Although the data obtained in the simulation laboratory is true and valid, the source is unknown and cannot be used directly.
　　 However, he does not intend to directly use the optimal conditions he has explored.
　　On the one hand, the P2FBT4T-2OD material currently in the laboratory is a P12 type with a reaction time of 12 hours.
　　The best condition is the P10 type, so even using the "optimal condition" is not the "optimal condition".
　　 On the other hand, the main reason is that if the performance of the device is improved too much at one time, such as the efficiency directly rises to 9.6%, Mr. Wei will have more expectations for the performance of the device.
　　 He would think: "It's only the second time to make a device~EbookFREE.me~ The efficiency has increased from 8.8% to 9.6%, so how many more attempts will it not break 10% every minute?"
　　 In fact, Xu Qiu has made eight batches of devices, and all the optimization methods that can be used are used, and it can reach 9.7%.
　　 There is still no clue as to how to further improve device performance.
　　 He also tried to perform high-level deduction on spin coating before.
　　 can consume 500 points. After watching the operation demonstration several times, I found that there is no gain.
　　 Because of the operations in the high-level deduction, he has learned everything he can learn now, nothing more than spraying, thermal coating, slow first and then fast.
　　 Moreover, the system only teaches him these operating methods, and the system will not tell him which method is most suitable for his system.
　　 is all on self-understanding.
　　 Besides, the improvement of the photoelectric performance of the material by the experimental operation is also limited.
　　 If the upper limit of a material is 9.9%, then no matter how gorgeous the operation, the final result can only be infinitely close to 9.9%.
　　 Xu Qiu actually thought of some other ways.
　　 For example, if the effective area of ​​the battery device is reduced from 0.09 square centimeters to 0.04 or even 0.01 square centimeters, the efficiency will definitely increase.
　　 He even planned the operation method:
　　 First, cut a square hole with a side length of 2 mm in the middle of the stainless steel plate, and then stick it on the surface of the battery substrate, and then test with a solar simulator. The actual area of ​​the battery device illuminated by light is 0.04 square centimeters.
　　 However, this method is not much different from lying to yourself.
　　 But if there is no other way in the end, this method is not impossible to use.