Siheyuan: Start with a big car

Solar cell power generation sounds very high-tech, and it was boasted as a high-tech industry by the media of later generations.

In fact, in 1954, Bell Labs had invented a commercially available solar cell.

Although the power of the solar cell is only 1 watt, it can only drive a special small ferris wheel.

But in just 60 years, solar cell power generation has become an important means for people to obtain energy.

Solar cell power generation has many advantages such as low cost and less pollution, and is very suitable for use in this era of scarcity of materials.

After Li Weidong made up his mind, he dropped the pen in his hand, stood up and hugged Yu Li's waist: "Daughter-in-law, let's go to sleep."

The next day, when the sun was three poles high, Li Weidong got up.

Washed hastily, ate breakfast, punched in the team card, and slipped out on a bicycle.

Now Li Weidong is a ninth-level engineer and is also responsible for the research of heavy trucks in the Jiefang Plant. The rolling mill has specially approved him to commute freely.

After all, Jiefang Factory promised to fund fifteen hundred-ton kings.

If one driver is exchanged for fifteen hundred-ton kings, our rolling mill will not suffer.
-
Out of the rolling mill, it was sunny outside.

The people who came and went in a hurry on the street, although they were thin and plainly dressed, their faces were filled with a spirit that was scarce in later generations.

In this era, people clearly know what they are striving for.

That is to build a poor and weak country into a rich and powerful big muscle hegemony country.

The task is arduous but honorable, and there is a positive atmosphere in the air.

Li Weidong swam in it and was also infected by this atmosphere.

The mood gradually became excited, and the strength of kicking the pedals suddenly increased a little.

In order to make solar panels, you must have the corresponding knowledge and become an expert in physics.

Most people need more than ten years of study to be able to do it.

But for Li Weidong, who has tens of thousands of times of experience, it may only take one morning.

Li Weidong grabbed the cold handlebars and rode all the way to the library.

"Look, that comrade who borrowed more than thirty books at a time is here again."

"Ahem, Comrade Weidong, our library stipulates that in order to ensure that residents can borrow books, each person can borrow up to five books at a time."

". New regulations?"

"It was promulgated the day before yesterday." The little librarian swallowed and spit.

There is no way, last time Li Weidong borrowed all the books about cars from the library, which made the old comrades who came to look up the information furious.

"Can I read a book here?"

"Reading is not restricted, as long as you don't take it out of the library."

"Thank you!"

"." The little librarian seemed to realize that he had said something wrong.

Li Weidong was also helpless.

Isn't it just that in one month, more than 200 books on automobiles have been received in succession, is it necessary to modify the system?
Fortunately, solar cells are simpler than car sites, and the number of related books is also small, which can be read in the library.

Holding the library card, he came to the 'Science and Technology Zone' according to the classification instructions hanging on the roof.

Most of the people in this area are old comrades in gray tunic suits with gray hair.

A young guy in overalls like him is the only one in this area.

"Optoelectronic Design Principles", "Circuit Construction".
Looking for books from shelf to shelf, in just 10 minutes, Li Weidong hugged a lot of books.

"Detailed Explanation of Maxwell's Equations (Russian Version)", good stuff, live!

Reaching out to take down the book, a handsome face appeared opposite.

"Huh? Driver Li, are you here to borrow books too? They're all about physics."

Ran Qiuye was a little surprised to see Li Weidong carrying a lot of books.

Li Weidong moved his body, and the book held by his arm was a little loose: "Stop standing there, come and help quickly."

"Uh uh."

Ran Qiuye ran over and helped Li Weidong carry the book to the desk next to him.

Looking at the dozens of thick books, Ran Qiuye felt that his little head was not enough.

Does an old driver use to learn Maxwell's equations?

By the way, I heard from Mommy Stick that Li Weidong seems to have helped the rolling mill team design a lot of good things.

Is he going to invent again?
Well, it must be so.

Comrade Li Weidong, the driver, never forgets his original intention. After hard work and self-study, he finally
Ran Qiuye had unknowingly conceived a promotional draft.

Looking down at the "People's Pictorial" in her hand, she lowered her head in shame.

Li Weidong scratched his head when he saw Ran Qiuye's face turn red and white.

It seems impolite not to say anything at this time.

But it seems wrong to say something.

"Look at one piece?"

"it is good"

Ran Qiuye broke free from embarrassment, and quickly sat down and covered her face with "People's Pictorial".

Immediately, I realized something was wrong, and put down "People's Pictorial".

Li Donglai saw some clues and said with a smile: "Teacher Ran, there are many good articles in the pictorial, you must want to extract them and read them to the children, right?
It is a blessing for the children to have such an excellent teacher as you. "

"Ah. That's right, I didn't expect you to guess right." Ran Qiuye hurriedly took out a pen and paper from his canvas pocket.

The tip of the pen poked the paper, and she froze.

Right, right, I'm a math teacher!

With the blessing of ten thousand times of experience, it only took one morning for Li Weidong to master the knowledge needed to manufacture solar panels.

It can be said that now that he has attainments in physics, he can already be Hu Guangliang's teacher.

Stretching out comfortably, he looked at Ran Qiuye who was still copying the article: "Teacher Ran, the library is about to get off work, shall we go back?"

"Good good."

Ran Qiuye shook his sore hands, looking at the thick notebook, he was speechless.

What did I do all morning?
"Goodbye, Teacher Ran!"

Li Weidong, who was in a hurry to go home and cook, said hello, got on his bicycle and was about to leave.

Out of the corner of his eye, he saw Ran Qiuye squatting on the ground, and he turned around again.

"what happened?"

"...the chain fell off."

Li Weidong strapped on his bicycle and ran over, eagerly said, "Why don't I try it?"

At this time, dense sweat had already oozed from Ran Qiuye's forehead.

In order not to stain the new clothes, she could only pick up the bicycle chain with a wooden stick, but she failed to pick it up after several times.

For an old driver who often repairs cars, repairing a bicycle is a matter of holding hands.

Li Weidong took the wooden stick, pulled a thousand catties in four or two, and with a slight pick, the chain returned to the sprocket.

"Come on, try it."

Ran Qiuye rode on the bicycle obediently, while Li Weidong gave orders beside him.

"Kick off."

"...can't move."

"Strong."

"...I can't push even if I try hard."

"Put it hard."

"Crack."

The bicycle chain broke in two, like a limp hose, hanging down on the dusty ground.

Ran Qiuye:
Li Weidong:
I really didn't expect that this little girl looks delicate and has great strength.

There is no car repair shop near the library, and the nearest car repair shop is three or four miles away.

Li Weidong felt sorry for letting a little girl push the bicycle so far.

Fortunately, as an old driver, you must have a rope when you go out.

Untie the rope from the seat, tie one end to the rear bumper of the bicycle, and the other end to the front of Ran Qiuye's bicycle.

"Ready? I'm going to start."

"Okay, you slow down."

Li Weidong kicked his pedals lightly, "Let's go", and the bicycle slowly moved forward.

Under the traction of the rope, Ran Qiuye sat on the bicycle, as long as he held the handlebars firmly.

The owner of the car repair shop is surnamed Liu. He wears a thin yellow-brown coat, yellow rubber sandals in winter, and also wears that broken straw hat indoors. He is not afraid of becoming bald.

Although his personality is eccentric, his workmanship is good, and the price is very reasonable. It only costs five cents to repair the chain.

"Thank you so much today. If it weren't for you, I really don't know what I would do."

"I am also responsible for this matter. Of course I have to be responsible. You are welcome."

Repairing the chain requires the help of customers, and Li Weidong's hands will inevitably be a little oily.

Ran Qiuye saw it while speaking, and took out a handkerchief from his pocket and stuffed it into Li Weidong's hand.

"Scrub."

"How funny is that."

Before he finished speaking, Ran Qiuye got on his bicycle and left. Seeing the figure disappearing into the crowd, Li Weidong stuffed his handkerchief into his pocket.

"Comrade boss, is there any soap?"
-
In the capital city, in the small woods outside the ministries and commissions compound.

Hu Guangliang looked at the barren scene around him, felt a little timid in his heart, gathered his clothes, and walked quickly behind a tall figure.

"Weidong, why do you want to make an appointment here?"

"Don't you think there's an atmosphere of doing bad things here?"

Li Weidong turned around, looked around, and said in a low tone, "The withered flowers, decayed leaves, and dry branches, combined with the Xiao Xiao cold wind, are too suitable for the occasion."

"." Hu Guangliang swallowed and spit, and asked cautiously: "Aren't you going to prepare solar panels?"

Li Weidong took out a piece of paper from his pocket and handed it over: "Copper sheet, ferric chloride solution, alcohol, tin plating, multimeter, double-layer capacitor, toothpaste. I need these materials, please make a price!"

That expression was extremely tense.

That tone was extremely low.

With one hand in the pocket, the wind blows, the hair is messy, and it is matched with the dust raised.

Just like the bad guys on TV.

"Brother, have you watched too many enemy agent movies recently?"

"You saw it."

"."

In this day and age, which man doesn't want to catch enemy agents?

Hu Guangliang looked at the note, shook his head and said, "The above materials are all easy to get, I just need to write a letter of introduction for you. But, toothpaste? Are you sure it's useful?"

Although he does not understand the specific manufacturing method of solar panels.

However, toothpaste is used for brushing teeth, how can we make equipment?

Li Weidong: "Let me ask you, what is the main ingredient of toothpaste?"

Hu Guangliang raised his eyelids: "Calcium carbonate, calcium hydrogen phosphate, silicon dioxide, aluminum hydroxide, silicon dioxide!"

He widened his eyes excitedly, walked back and forth on the fallen leaves with his hands behind his back, and muttered to himself: "Silicon dioxide is a kind of polysilicon, which can produce a photovoltaic effect. When light shines on the surface of silicon dioxide, part of the photons are captured Silicon material absorbs; the energy of photons is transferred to silicon atoms, causing electrons to migrate and become free electrons to gather on both sides of the PN junction to form a potential difference. When the external circuit is connected, under the action of this voltage, it will be There is current flowing through the external circuit to generate a certain output power."

"Brilliant! That's great! Compared to Bell Labs' monocrystalline silicon solar cells, silicon dioxide costs less."

Li Donglai nodded: "Not only is the cost low, if we design a silicon dioxide photonic crystal coating material by etching micron-scale holes on the silicon dioxide sheet, it can also greatly improve the efficiency of photoelectric conversion. I have It has been calculated that the conversion efficiency of solar panels made by this method will reach 80%."

"80%..." Hu Guangliang suddenly widened his eyes.

As a university graduate who is committed to the research of science and technology, although he works in the ministry, he has not given up on the study of cutting-edge science and technology.

Especially in ministries and commissions, they are qualified to contact foreign academic journals.

The solar cell power generation panels of Bell Labs, which are boasted so amazingly that they can change the status quo of human energy, have a conversion efficiency of less than 30.00%.

Conversion efficiency is the ratio of solar energy converted into electricity.

The higher the efficiency, the more electricity the solar panel can generate for the same surface area.

Hu Guangliang originally thought that Li Weidong just wanted to make a small toy on a whim.

Now realize that solar cells may really have a lot to do.

Working in a ministry, Hu Guangliang has a deeper understanding of the current energy situation in China than ordinary people.

Most of the equipment in domestic power plants is imported from abroad, not only in small quantities, but also often have problems.

Energy is extremely scarce, and even in the capital city, there are frequent power outages.Not to mention the vast rural areas, 80.00% of the places have no electricity at all.

Not to mention industrial production, when ministries and commissions plan factories, they must first consider whether the electricity can support them.

Although Li Weidong's solar panels are limited by sunlight and cannot provide continuous power supply, they are enough to meet the electricity consumption of ordinary households.

If it can be successfully developed, it must be a great thing that benefits the country and the people.

After thinking about this, Hu Guangliang immediately returned to the ministry to help Li Weidong issue the letter of introduction needed to purchase materials.

Of course, these materials are very common chemical materials, they are not dangerous, and there is no violation of regulations.

It cost a total of 1 yuan and 2 cents to buy materials, and the most expensive one is the double-layer capacitor.

Holding the double-layer capacitor, Yu Li asked curiously: "Brother Weidong, what is this round thing, it seems to be bigger than the semiconductor in the radio?"

"It's almost like a semiconductor, it's used to stabilize the voltage."

Li Weidong put the rectangular copper sheet on the table, and used ferric chloride solution to draw neat circuit lines on the copper sheet.

After the line is dry, ask Yu Li to help clean the copper piece with alcohol.

Although Yu Li didn't believe that a piece of copper could generate electricity, she was still happy to help Li Weidong.

After the copper sheet was cleaned, Li Weidong plated a layer of tin on the circuit lines, then coated a layer of toothpaste on the tin plating, and finally soldered two wires on the positive and negative electrodes of the copper plate.

"It should be almost there now, let's go to the compound and try."

Li Weidong came outside the door with a copper plate and a lamp holder.

Just finished lunch now, the sun is shining outside, and the residents are moving stools outside to bask in the warmth.

The adults are gossiping, the children are chasing and beating, and the hustle and bustle is full of the fireworks of life.

The copper plate and the lamp holder quickly attracted the attention of the residents.

Sha Zhu came over with He Meimei in his arms: "Brother Weidong, what are you doing?"