Chapter 434: Karen Mok's subconscious reaction

After finishing the credit card business, Xu Qiu began to plan the next tasks.
Now he has only one article to be published, that is, the "full solution method, translucent, colorful device" work that the school sister is doing, and he plans to vote for "Joule".
For Xu Qiu now, he will soon finish writing this article and submit it, so it is time to start a new wave of work.
Moreover, the key project funds that are about to be applied for also need some preliminary work to support.
In fact, Xu Qiu had already produced the prototype of the new work long ago, and he has also had a certain preview in the simulation laboratory.
However, due to the busyness of various things in reality, it has been too late to start.
There are three main ideas, all of which have been verified by the system, and all work in general directions:
First of all, it is to prepare a polymer donor material with simple structure, few synthesis steps and low production cost. At the same time, it must meet the conditions of matching with the ITIC series of non-fullerene acceptor materials and good photoelectric performance. It is tentatively designated as the PTQ series. This idea is mainly to try to solve the cost problem in the field of organic photovoltaics.
Secondly, by introducing nitrogen atoms, the D unit in the ITIC series of non-fullerene acceptor molecules is modified, in an effort to break the current upper limit of the photoelectric performance of the current ITIC series of materials, and break the photoelectric conversion efficiency of organic photovoltaic devices to 14 %, 15%.
Finally, based on the preliminary work of translucent organic photovoltaic devices, laminated devices are prepared. The purpose of this is also to break the upper limit of the current device efficiency, reaching 14% and 15%.
The first two tasks are planned to be written in the key project application plan ~EbookFREE.me~Get cash] Follow vx public. Public number [Book Friends Base Camp~EbookFREE.me~ You can also get cash!
Therefore, it is best to finish the preliminary work before Wei Xingsi invites Gong Yuanjiang and the others to come to the meeting, so that they can connect with Gong Yuanjiang.
The meeting was held in December, and it is now mid-November, and there is not much time.
In addition, the three articles submitted by Xu Qiu, an "Nature·Energy", an AM, and an "Joule" review, have all been submitted for a month, and comments on the articles may be returned at any time.
If you encounter a major change, it is estimated that you will have to toss for three to five days. When you encounter three major changes, you will basically not have to work for a month.
In addition, I still have an article "Joule" to write, and I will go to the visa interview next week...
If you think about it carefully, there are so many things...
Fortunately, Xu Qiu's ability to resist stress was relatively strong, and after a few deep breaths, he recovered his composure.
Moreover, Xu Qiu has a team, he is not fighting alone:
Chen Wanqing is helping him with the experimental work of "Joule". Han Jiaying and Wu Shengnan have notified them in advance and will take them to synthesize PTQ series donors and Y series receptors next week.
The rest is the work of laminated devices. If you find a helper to help, the senior sisters, seniors and post-doctorate seniors have all used them. It is not suitable to use them again. Tian Qing is also not suitable, and a few new undergraduates It's okay to let them run errands and send materials, and they can't be counted on for the experiment.
After thinking about it, you can only find Mo Wenlin.
Mo Wenlin is doing experiments in the inner laboratory at this time.
Just after Xu Qiu made the decision, she seemed to feel a little bit in her heart. She suddenly palpitated, and the hands that operated in the glove box paused, and she couldn't help but clamp her legs.
In fact, this is not metaphysics, it is purely because Mo Wenlin heard Xu Qiu's footsteps.
Just as Wu Feifei judged Wei Xingsi's footsteps very accurately, Mo Wenlin judged Xu Qiu's footsteps very accurately.
The moment she heard Xu Qiu's footsteps, Mo Wenlin had already made up a lot of content in her mind like a conditioned reflex:
‘The people in the inner laboratory are all from the perovskite team, except for themselves, so Xu Qiu must have come to look for me. ’
‘In recent days, Xu Qiu took the initiative to come to the laboratory to find me. Eight out of ten times, he asked me to help with the experiment. After that, it took a long time and couldn’t stop. ’
‘I’m not going to help this time, eh, eh...’
A few seconds later, Xu Qiu walked into the laboratory, came to Mo Wenlin's side, and said hello with a smile: "I'm busy, how is the experiment done recently."
"It's okay. The performance of the devices of the two ternary systems is good, and both have exceeded 12%..." Mo Wenlin briefly talked about the progress of her work, and then slowed down her speech and tested carefully: "You come to me, yes Want me to do experiments for you."
"I can see it by you," Xu Qiu touched his head, smiled awkwardly, but continued: "Next, I am going to develop in the direction of stacking. I need your help to optimize the processing of stacked devices. Craftsmanship."
"Um...Okay, how do you do it?" Mo Wenlin did not refuse, she was really "eating people with short mouths and soft hands." She has published several AM and AEM articles, not to mention Xu Qiu. Right, but Xu Qiu's contribution must still account for at least 30% or even more than 50%.
Xu Qiu made gestures and explained:
"For double-junction laminated devices, there are mainly two preparation methods, one is the ‘two-terminal method’ and the other is the ‘four-terminal method’.

"'Four-terminal method', this structure is actually two separate devices, one of which is semi-transparent, the other is a normal opaque device, and then they are stacked together to absorb a unit of sunlight, and at the same time Stack them together in series to test the efficiency of the series battery.
"'Two-terminal method', this structure is to prepare an integral laminated device, that is, directly prepare two battery devices in series on a substrate. The device structure is similar to: glass, ITO, zinc oxide, effective layer 1, Molybdenum trioxide, thin layer silver... zinc oxide, effective layer 2, molybdenum trioxide, silver like this."
Xu Qiu's explanation is relatively easy to understand. Mo Wenlin nodded and asked after hearing it clearly: "Then what method do we use to prepare laminated devices now?"
"Let’s use the'four-terminal method' first. This method is relatively simple." Xu Qiu finished speaking, changing the subject:
"However, the'four-terminal method' is just a transitional method. We will eventually develop towards the'two-terminal method'. Because I have read recent articles on laminated devices in the field of organic photovoltaics, most of the high-quality articles used They are all relatively complicated'two-terminal methods', that is, a single laminated device is directly prepared."
Xu Qiu is still a newcomer in the field of "stacked devices". He is not clear about the reasons why colleagues do not use the "four-terminal method" to prepare stacked devices in the field of organic photovoltaics."
In addition, the computing power of the previous simulation laboratory was mainly focused on the development of new materials, and there was not much investment in the laminated device.
Nevertheless, Xu Qiu can roughly guess some possible situations:
First, this method may not be widely recognized in the field of organic photovoltaics, or that a certain bigwig prefers the "two-terminal method", which biases the direction of other people's scientific research.
Of course, this possibility is relatively low. After all, in traditional inorganic silicon, CIGS (Copper Indium Gallium Selenide) and other photovoltaic devices, the proportion of stacked devices using the "four-terminal method" is not low.
Secondly, this method may have big flaws, such as the inability to improve the performance of the device.
Relatively speaking, the possibility of this situation is relatively high. After all, the main pursuit of stacking is device efficiency.
If the efficiency of the device is not improved, the effect is not as good as the original single-junction standard device after a single operation, and the stacking will lose its meaning.
Regardless of the specific reasons, you need to experiment personally before you can figure it out.
Karen Mok asked: "What are the specific systems we want to do?"
Xu Qiu pondered for a moment and responded: "As much as possible, prepare as many solutions as possible, and do all the existing systems that can be thought of, especially the high-efficiency systems that have been published."
When Mo Wenlin heard this, she let out a "hiss", took a breath, and then her neck shrank, and she looked like she was unlovable: "...I understand what you mean, I'll wait. Prepare the solution."
Today is Friday, and Mo Wenlin has no plans to prepare the device. She happened to be preparing the solution when Xu Qiu came over.
It's all right now. Next, she conservatively estimated that more than a dozen solutions will be prepared. It is estimated that she will not be able to make it out for a while.
"Thanks." The task has been confided, Xu Qiu decisively greased the soles of his shoes and returned to the desk.
He was just talking to Mo Wenlin about the device structure of the "two-terminal method" laminated device. When he mentioned zinc oxide for the second time, he paused because he thought of a problem.
That is to use the sol-gel method to prepare zinc oxide nano-films, which require high-temperature annealing at 200 degrees Celsius in the air.
In ordinary devices, such annealing is definitely not a problem, because zinc oxide is the first spin-coated film, and it is directly applied to the smooth substrate. It doesn't matter how much it waves.
However, there is a problem in laminated devices. The second layer of zinc oxide has a complete battery device under it, especially the thin silver electrode adjacent to it. If it is annealed in the air~EbookFREE.me~silver The electrode will definitely be oxidized. Even if it is annealed in a glove box, the morphology of the effective layer may undergo unknown changes due to high temperature annealing.
How to solve this problem?
Xu Qiu thought for a moment, and soon thought of several ideas.
First of all, you can change the transmission layer material, choose the transmission layer material that does not require high temperature annealing, such as PFN, PDIN, PEIE, etc., if necessary, you can also change the device structure, such as from "inverted type" to "normal type".
Secondly, it is not impossible to continue to use zinc oxide, but it is necessary to lower its annealing temperature, for example, to 150 degrees Celsius, and then move it into a glove box for thermal annealing, to bet that the zinc oxide film formed by annealing at this temperature can serve as a transmission layer. And it will not affect the underlying battery devices.
In addition, the method for preparing the zinc oxide nano-film can be changed, and a method for preparing the zinc oxide nano-film without high-temperature annealing can be found.
So, which one to choose?
It doesn't seem to be a problem, there is a system to help, just try everything once.