I Have a Research Support System

After finishing the credit card business, Xu Qiu began to plan the next work tasks.

Now he has only one article waiting to be published, that is, the work on full solution method, translucent, colorful devices that his senior sister is doing, and he plans to submit to Joule.

For the current Xu Qiu, he will soon finish writing and reject this article, so it is time to start a new wave of work.

Moreover, the key project fund that will be applied for soon also needs some preliminary work to support it.

In fact, Xu Qiu had produced the prototype of the new work a long time ago, and 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 are feasible in general:

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 have good photoelectric performance. It is tentatively designated as the PTQ series. This idea is mainly trying 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, trying to break the upper limit of the photoelectric performance of the current ITIC series materials, and break through the photoelectric conversion efficiency of organic photovoltaic devices to 14 %, 15%.

Finally, based on the previous work of semi-transparent organic photovoltaic devices, stacked devices were prepared. The purpose of this is also to break through the upper limit of the efficiency of current devices, reaching 14% and 15%.

The first two jobs are planned to be written in the key project application plan.

Therefore, it is best to complete the preliminary work before Wei Xingsi invites Gong Yuanjiang and the others to come to the meeting, so that they can communicate with Gong Yuanjiang.

The meeting was held in December, and now it is mid-November, so there is not enough time.

In addition, the three articles submitted by Xu Qiu before, one Nature Energy, one AM, and one Joule review, have been submitted for a month, and comments on the articles may return at any time.

If there is a major change, it will probably take three to five days. If there are three major changes, basically there will be no work for a month.

In addition, I still have a Joule article to write, and I have to go to the visa interview next week...

If you think about it carefully, there are really many things...

Fortunately, Xu Qiu's ability to withstand stress is relatively strong, and after a few deep breaths, he regained his composure.

Moreover, Xu Qiu has a team, he is not fighting alone:

Chen Wanqing is helping him with the experimental work of Joule, and he has informed Han Jiaying and Wu Shengnan in advance that he will take them to synthesize PTQ series donors and Y series acceptors next week.

The rest is the work of stacking devices. If you want to find a helper, the seniors, juniors, and post-doctoral seniors have all used them, and it is not suitable to use them again. Tian Qing is also not suitable, and several new undergraduates It's okay to let them run errands and deliver materials. For the experiment, I can't count on them for the time being.

After much deliberation, the only way to find Mo Wenlin was.

At this time, Mo Wenlin was doing experiments in the inner laboratory.

Just after Xu Qiu made a decision, she seemed to sense something, her heart shuddered suddenly, the hand operating in the glove box froze, and even her legs tightened involuntarily.

In fact, this is not metaphysics, it is purely because Mo Wenlin heard Xu Qiu's footsteps.

Just like 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 reflexively made up a lot of things in her mind:

'Now the people in the inner laboratory are all from the Perovskite team except myself, so Xu Qiu must have come to look for me. '

'As for Xu Qiu who came to the laboratory to look for me recently, eight out of ten times he asked me to help with the experiment, and then he did it for a long time, and he couldn't stop at all. '

‘I’m not going to help you this time, huh…’

A few seconds later, Xu Qiu walked into the laboratory, came to Mo Wenlin's side, and greeted Mo Wenlin with a smile: I'm busy, how are the experiments going?

It's not bad. The performance of the devices of the two ternary systems is good, and they both broke through 12%... Mo Wenlin briefly talked about her work progress, and then slowed down her speech, carefully probing: You came to me, is it You want me to help you with the experiment.

You can see it. Xu Qiu touched his head and smiled awkwardly, but continued: Next, I am going to develop in the direction of stacking, and I need your help to optimize the processing of stacked devices. craft.

Well... okay, how do I do it specifically? Mo Wenlin didn't refuse, it's really short to eat people, soft to take people, the few AM and AEM articles she has published now are all thanks to Xu Qiu Well, but Xu Qiu's contribution must have accounted for at least 30% or even more than 50%.

Xu Qiu made gestures while explaining:

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 independent devices, one of which is translucent and 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 batteries.

'Two-terminal method', this structure is to prepare an integral laminated device, that is, to prepare two series-connected battery devices directly on a substrate. The device structure is similar to: glass, ITO, zinc oxide, active layer 1, Molybdenum trioxide, thin layer of silver ... zinc oxide, active layer 2, molybdenum trioxide, silver like this.

Xu Qiu's explanation was relatively easy to understand. Mo Wenlin nodded after hearing it and asked, Then what method do we use now to prepare laminated devices?

Let's use the 'four-terminal method' first. This method is relatively simple. After Xu Qiu finished speaking, he changed the subject:

However, the 'four-terminal method' is only a transitional method, and we will eventually develop towards the 'two-terminal method'. Because I read recent articles on stacked devices in the field of organic photovoltaics, most of the high-quality articles use the They are all relatively complicated 'two-terminal methods', that is, to directly prepare a single stacked device.

Xu Qiu is still a newcomer in the field of stacked devices, and he is not yet clear about the reason 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 concentrated on the development of new materials, and there was not much investment in stacked devices.

Even so, Xu Qiu can generally guess some possible situations:

First, it may be that this method is not widely recognized in the field of organic photovoltaics, or that a certain boss prefers the two-terminal method, which leads other people's scientific research direction astray.

Of course, this possibility is relatively low. After all, in traditional inorganic silicon, CIGS (copper indium gallium selenium) and other photovoltaic devices, the proportion of laminated devices using the four-terminal method is not low.

Second, this method may have serious flaws, such as poor device performance.

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 does not increase, the effect of the original single-junction standard device will not be as good as that of the original single-junction standard device, and the stacking will lose its meaning.

No matter what the specific reason is, it needs to be tested by yourself before it can be figured out.

Mo Wenlin asked: What is the specific system we want to build?

Xu Qiu thought for a moment, and responded: Make as many solutions as possible, and do all the existing systems that can be imagined, especially the high-efficiency systems that have been published.

After hearing this, Mo Wenlin let out a hiss, took a deep breath, then shrank her neck, and made a look of lovelessness: ...I understand what you mean, I'll wait Make a solution.

Today is Friday, and Mo Wenlin has no plans to make devices, and she happened to be preparing solutions when Xu Qiu came over.

Now it's all right, she conservatively estimates that she will prepare more than a dozen solutions, and she probably won't be able to get out for a while.

Thanks for your hard work. The task was assigned, Xu Qiu resolutely greased the soles of his shoes and returned to his 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 coated on a smooth substrate, and it doesn't matter how rough it is.

But there is a problem in the laminated device. There is a complete battery device under the second zinc oxide layer, especially the thin layer of silver electrode adjacent to it. If it is annealed in air, the silver electrode will definitely oxidize. When annealed in a glove box, the morphology of the effective layer may also undergo unknown changes due to high temperature annealing.

How to solve this problem?

Xu Qiu thought for a moment, and quickly thought of several ideas.

First of all, the material of the transport layer can be replaced, and the material of the transport layer that does not require high-temperature annealing, such as PFN, PDIN, PEIE, etc., can be selected. If necessary, the device structure can also be changed, such as from inverted type to normal type.

Secondly, it is not impossible to continue to use zinc oxide, but it is necessary to reduce its annealing temperature, such as 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 act as a transport layer, And it will not affect the battery device in the lower layer.

In addition, the preparation method of the zinc oxide nano film can also be replaced, and a method for preparing the zinc oxide nano film without high-temperature annealing can be found.

So, which one should you choose?

It doesn't seem to be a problem, there is a system to help, just try everything once.