Chapter 66: Book a test

　　 Xu Qiu rested for a while, ready to continue the experiment.
　　 "Senior sister, the four perovskite systems, wait for EQE, CELIV, UV-VIS, etc., to do all the tests?" Xu Qiu asked.
　　 "It's not necessary," Chen Wanqing said:
　　"Because the main highlight of this article is your 4# sample, and it is posted, so other systems do not need to be too detailed.
　　 Their data will also be included in the supporting information. In the text, you only need to compare the similarities and differences between PEDOT and 4# samples. "
　　 "In addition to the characterization methods I learned just now, what other tests do I need to add?" Xu Qiu asked.
　　 Chen Wanqing raised her head in a thoughtful manner, and while holding her finger, she said:
　　" Device stability, test the photoelectric performance of the device at intervals to see the degradation of the photoelectric performance over time;
　　 Repeat several batches of devices to see if the data is repeatable, and you can also try inverted structure devices;
　　 Use cyclic voltammetry, CV, to test the conduction band and valence band energy levels of perovskite materials;
　　Using X-ray diffraction method, XRD, test the crystalline properties of perovskite materials;
　　 Finally, use a scanning electron microscope, SEM, to test the thickness of the transmission layer.
　　 That's almost it, plus write an article, try to get it done within a month. "
　　 "It sounds like a lot of tests need to be added." Xu Qiu said.
　　 "Come on together." Chen Wanqing waved her small fist and said:
　　 "Fortunately, this article is equivalent to only 4# sample and standard sample two systems, so the test should be faster."
　　…………
　　 Two hours later.
　　 Xu Qiu completed three tests, processed the data, and drew them into pictures.
　　 "Sister, how is my article changed?" Xu Qiu said.
　　 "Almost," Chen Wanqing said:
　　 "The English of the student is really good. Basically, I can't spot the faults in grammar and spelling. The main problem is data analysis. In some places, the analysis is not adequate.
　　 However, once you have accumulated a certain amount of literature reading, you will naturally understand the main routines in this field, and then this problem will be solved. "
　　 "Okay, I have finished the basic characterization," Xu Qiu said:
　　 "When will you teach me other means of representation?"
　　 "CV can be tested with the electrochemical workstation in our laboratory, I will teach you tomorrow," Chen Wanqing said:
　　"The other two are instruments on the public platform of the Department of Materials, which need to be trained before they can be used alone. At the beginning of this semester, you must remember to sign up for the next training.
　　 I’ll take you to the test this time. XRD requires an appointment. SEM generally does not require an appointment. But if you want to test, you have to wait until Monday at least. "
　　 "Okay, then I'll go back first. Don't be too late, senior sister, I have to go to work tomorrow." Xu Qiu said.
　　 "I know, goodbye."
　　 "Bye."
　　…………
　　 Back to the bedroom, Xu Qiu entered the simulation laboratory.
　　 Positive structure devices basically have no room for further regulation.
　　 This time he mainly wanted to verify whether the perovskite material can be used as an electron transport layer to replace the zinc oxide in the inverted structure.
　　 spin coating, evaporation, testing.
　　 Unfortunately, the results are not ideal, the highest efficiency is still 4# sample, the efficiency is only over 8%.
　　 After finishing the experiment, it was almost twelve o'clock again, so I had to go to the corridor to take a shower again.
　　 Xu Qiu discovered that the frequency of taking cold showers has increased dramatically since entering the laboratory and starting to do scientific research.
　　…………
　　 Sunday afternoon.
　　 Chen Wanqing took Xu Qiu to the outside of Room 104 on the second floor of the material, preparing to make an XRD appointment.
　　 This instrument is not an online appointment, you need to make an appointment at the place where the instrument is located.
　　 On the door of room 104, there is a paper appointment form pasted, which is brand new and without writing.
　　 The upper column says Monday to Friday, the left column is the specific time, such as 8:00-9:00, etc., and the rest are empty spaces in the form.
　　 "Which time slot you want to make an appointment, do you fill in it yourself?" Xu Qiu said.
　　 "Yes, fill in your name, research group and contact information in the corresponding position, and the appointment is successful." Chen Wanqing said:
　　 "When others see it and know that someone has made an appointment at this time, they will choose another time."
　　 "Why is it blank now, are there no people to test during summer vacation?" Xu Qiu said.
　　 "It may not have been long since it was posted. Usually, the appointment form for the next week is posted every Saturday or Sunday," Chen Wanqing said:
　　 "There should also be a reason for the summer vacation, XRD is usually quite popular, basically the weekly test time can be allocated."
　　 "But there is a bug in this form of appointment. What if I make an appointment and no one will come?" Xu Qiu said.
　　 "There have been many cases of what you said before. Later, the department stipulated that as long as you write your name on it, regardless of whether you come for the test or not, you will be charged for the length of the appointment," Chen Wanqing said:
　　 "However, XRD is cheaper. For internal testing, it looks like 100 per hour, 200 for external departments and 400 for external schools."
　　 "Well, how long do we make an appointment?" Xu Qiu said.
　　 "If only one sample is tested, it is estimated that it will not take ten minutes. Let's make an appointment for half an hour and test all four samples." Chen Wanqing said.
　　 "So about Monday morning?"
　　 "No on Monday morning~EbookFREE.me~ Our group usually has a group meeting every Monday morning," Chen Wanqing said:
　　 "You haven't participated before. Now you can participate. Make an appointment until 1:30 to 2:00 on Monday afternoon. Write my name."
　　 After Xu Qiu filled in the appointment information on it, the two returned to the first floor of the materials.
　　 They just passed the SEM equipment room on the first floor of the material.
　　 "There are relatively few people doing SEM testing. Generally, there is no need to make an appointment in advance. After the teacher in charge of the test comes to work on the working day, you can go directly to the test." Chen Wanqing proactively introduced.
　　 "Large instruments like XRD and SEM seem to be placed on the first floor." Xu Qiu said.
　　 "Yes, because large instruments are heavier, their weight is measured in tons, and they are large, and it is difficult to get to the upper floors without professional equipment." Chen Wanqing said:
　　 "In addition, the first and second floors of materials are both decades old, and the load-bearing capacity is not good enough, so they are basically placed on the first floor."
　　 "I heard that the school is planning to renovate a number of old buildings." Xu Qiu said.
　　 "This kind of old building renovation is useless, just repainting and tiling tiles will not change the nature of the old building." Chen Wanqing said:
　　 "Furthermore, this kind of thing, before the red-headed documents, are all groundless, I don't know that the news will take a few years to start construction."
　　 "That's right, I remember when I was in elementary school, the school said that we would rebuild the concrete playground into a rubber track, but after I graduated, it was renovated." Xu Qiu said.
　　 "In middle school, I said I was going to build a new cafeteria, and then I graduated and the cafeteria was built."
　　 "The experience is similar to mine, anyway, good things will always be left to future generations." Chen Wanqing smiled.