Chapter 900: Warmth for Soldiers
Seeing that everyone was looking at him, he raised the materials in his hand and tapped the parameter page: "This... this... is impossible? Was the material typed wrong and not reviewed?"

For example, 1 and 2 are too close, so 10.3% becomes 20.3%, but this cannot explain the 17.1%.

"What's impossible?" The other comrades haven't seen this yet.

The comrade who worked on the satellite power supply pointed at the materials and was so excited that his voice was even a little hoarse: "They have two types of solar cells. The efficiency of polycrystalline silicon is 17.1%, and the efficiency of monocrystalline silicon is 20.3%!"

There were some comrades at the meeting who were related to solar cells, and they were furious on the spot.

"How many?"

"More what?"

"17? 20?"

"Are you kidding me?"

"This is impossible!"

It’s no wonder that comrades don’t believe it, it’s mainly because the number is too shocking.

Everyone looked at the reporting group sitting at the reporting seat. There are indeed comrades working on satellites here, but your satellite is a little too big.

Even the Defense Work Committee was shocked. The materials were brought by Gao Zhendong and his team. They had never seen them before and had no idea that there was such a big bombshell inside.

I remember that Comrade Gao Zhendong said 15% at the time, and it was finally lowered to 12% by the Defense Work Committee itself. Now it seems that he didn't take that indicator seriously at all and focused on being a rebel.

Lower the target? I won’t.

Not to mention the original 20.3% of monocrystalline silicon, even the polycrystalline silicon that appeared out of nowhere was as high as 17.1%, far exceeding any indicator mentioned at the time.

However, when the comrades from the Defense Work Committee saw Gao Zhendong sitting there, they felt calmer. Maybe... this was true?
Gao Zhendong did not speak. Tang Shaohui pushed his glasses and said, "Comrades, you are right. This is the number. I will report the details to the leaders and experts later."

They also knew that it would be impossible for them to be introduced individually before the meeting, so the comrades working on satellite power supply had to suppress their anxiety and excitement and wait for the meeting to begin.

The Defense Work Committee did not disappoint them. When the time came, they immediately announced the start of the meeting. They did not wait for anyone, but for time.

Tang Shaohui was confident and talked eloquently while holding up a slide show.

"...After many tests, the average efficiency of monocrystalline silicon..."

This is for comrades working on solar panels. At the most exciting moment, the efficiency of these two panels is simply ridiculously high!

"Comrade Tang Shaohui, is this efficiency measured on a single panel, or is it the result of comprehensive testing of multiple batches?" A comrade who works on solar panels knows very well that the most advanced solar panels in the country now have an efficiency of only about 7%. As for where they are used, he is not sure.

There is no need to ask about the test method, it is written on it, the standard test method. However, the test object is very particular, a board and a batch of boards are very different.

Some people who take advantage of opportunities are just a piece of wood, and they hide it without telling anyone.

"Multiple batches, random sampling, and then taking the average value." Tang Shaohui replied.

The comrade who asked the question was slightly relieved, thinking that this was not a big problem: "So how big is the deviation between these different batches of boards?"

Looking at the average value can reveal a lot of things, but it can also hide a lot of things. If the same average values ​​have large deviations from each other, they are almost useless.

"Less than 5%." Tang Shaohui understood the comrade's concerns, but he was confident that the information was actually also in the materials, but the answer "Please ask the expert comrade to look at the materials" was obviously inappropriate.

"Ah... That's great. I have no problem with that."

"How do you achieve such high efficiency?" A comrade was so surprised that he asked a stupid question.

Tang Shaohui was at a loss for words, so Gao Zhendong took over the conversation: "Haha, comrade, let's not discuss this matter here."

The meaning is very clear, don’t you understand the rules?

The comrade realized that he could ask such a question. He apologized and blushed.

"Why do you want an extra type of polycrystalline silicon solar panel?"

Tang Shaohui smiled and said, "Single-crystal silicon is very expensive, so we cannot afford it if we want to roll it out. And the efficiency of this polycrystalline silicon has reached a very high level. It is both cheap and easy to use, so it is more worthy of promotion at this stage."

Cheap? This immediately aroused the interest of the comrades including the Defense Work Committee. Comrade Gao Zhendong was still so thoughtful. He not only wanted to make it, but also to do it well and make it affordable for people. "How cheap is polysilicon?" the leader of the Defense Work Committee asked.

Tang Shaohui mentioned a production cost. Although it is unlikely to be the same price as it will be decades later, it still made all comrades who might use solar panels smile.

What a bargain! At least I can afford it.

It was originally unimaginable that solar panels with an efficiency of up to 17.1% could be produced at this cost. It is not a question of whether it is expensive or not, but that they are simply not available, even for import!

Gao Zhendong took the initiative to answer: "Let me add something to this matter."

There is something going on here that Tang Shaohui is probably too embarrassed to talk about, but Gao Zhendong has to tell it.

He mentioned that Tang Shaohui had fully exerted his subjective initiative and suggested developing another type of polycrystalline silicon solar panel.

"… This is the situation. With the initiative of Comrade Tang Shaohui and others from our 1761 Institute, we not only have the monocrystalline silicon solar panels originally planned for special purposes, but also have made polycrystalline silicon solar panels with low prices and excellent performance, providing a new high-tech means for low-power electricity use in remote areas."

This matter was suggested by Tang Shaohui, so Gao Zhendong must make it public. The contributions of his comrades cannot be obliterated inexplicably.

Gao Zhendong knew very well that Tang Shaohui was embarrassed to talk about this matter. If he didn't say it, other comrades would most likely take the credit for initiating this incident on his head, which he could not accept.

The leader of the 17th Ministry of Machine Building was also there. An achievement of this level, such as the ultra-high efficiency solar panels, was worthy of his support in this day and age.

After listening to Gao Zhendong's words, he was very happy. There were many reasons for his happiness, including technical, talent training and personal character.

"Well, you've done a great job! We just need more comrades like you so that we can do a better job in building society!"

He looked at Gao Zhendong and Tang Shaohui. These young comrades were the future.

Other comrades also applauded enthusiastically, some for Tang Shaohui and some for Gao Zhendong.

As for Tang Shaohui himself, he was filled with joy and touched. Chief Engineer Gao was so generous!
"…After testing, the efficiency of the two solar cell modules decayed by about 4% in the first year, and then by about 1% each year. Theoretically, after 20 years, the module efficiency would still be more than 75% of the initial efficiency."

This is a piece of data that many people did not expect. They did not expect that the attenuation of these two types of solar panels would be so low. You know, the earliest solar panels would degrade and become unusable in 5 years.

But this time no one asked how you did it. Instead, they were very interested in other related things: "This thing has just been developed. How did you measure its decay rate?"

Tang Shaohui smiled and said: "We used the relevant theories of equipment accelerated aging test proposed by Chief Engineer Gao to design a set of processes and a series of environmental conditions. We used high-energy ultraviolet rays to irradiate the components to simulate different time periods. Then, we tested under standard conditions of AM1.5, panel temperature of 25°C, and irradiance of 1000W/square meter. The results should still be of considerable guiding significance."

The Defense Working Committee then remembered that equipment acceleration testing was Gao Zhendong's old specialty. Now all the units under the Defense Working Committee used it.

"In addition, we have also conducted tests under radiation conditions. The tests showed that monocrystalline silicon solar panels fully meet the requirements for long-term operation under relevant irradiation conditions." Tang Shaohui added that as for what "relevant irradiation conditions" were, he did not say, and no one was stupid enough to ask.

"Where is polysilicon?" asked the comrade working on satellites.

Tang Shaohui shook his head: "Polysilicon has not been tested."

“Why not test it?” The comrade who was working on the satellite power supply expressed regret. This thing is cheap. Wouldn’t it be great if it could be used on satellites?
Gao Zhendong took over the conversation: "In order to obtain better efficiency, polycrystalline silicon solar cells use a P+/N-type structure, which is inherently unsuitable for use under irradiation conditions. This is different from single-crystalline silicon N+/P-type solar cells that can work under irradiation conditions. For solar panels under irradiation conditions, high efficiency is the top priority, and price is not a big problem. In this regard, single-crystalline silicon N+/P is the most suitable, and it is enough."

Gao Zhendong's words reminded some comrades that it was he who killed the high-efficiency P+/N-type monocrystalline silicon solar cell. It can only be said that Chief Engineer Gao has done in-depth research in this area.

After hearing this, the comrades who are engaged in satellite power supply were satisfied. As long as the most efficient solar panels could be used, there would be no problem.

"We want a batch of this stuff, a large batch! It's the kind made of polysilicon." Suddenly a voice came from behind.

Everyone turned around and saw that it was the military representatives who had vowed not to speak before the meeting.

No, how can you comrades not keep your word? You start snatching good things when you see them, right?
Everyone knows that even though polysilicon already has mass production technology, it will still take some time to ramp up production capacity, as the production capacity in the initial stage is absolutely insufficient.

Gao Zhendong laughed and said, "Well, it's good that the army is proactive. We have already considered it for you."

He nodded: "If you want to use it, you have to equip it with batteries, and you have to consider the design of the entire system carefully."

If you want to garrison in remote places such as mountainous areas, islands, and border lines, it is best to have electricity. In addition to communication equipment, even if it can only light a lamp, run a radio, or drive an electric fan, it will be the greatest warmth for the soldiers.

"Well, we are considering using nickel-hydrogen batteries." Gao Zhendong's words were a bit incoherent, but the comrades in the army obviously understood what Gao Zhendong was saying. I'm afraid that solar panels will be used soon.

(End of this chapter)