Solar cell power generation sounded lofty, and was touted as a high-tech industry by later generations of media.

In fact, in 1954, Bell Labs had already invented a solar cell that could be used commercially.

Although the solar cell has only 1 watt of power, it can only drive a small Ferris wheel specially built.

But just 60 years later, solar cells have become an important means of obtaining energy.

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

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

The next day, three poles on the sun, Li Weidong got up.

I washed up hastily, had breakfast, checked in the convoy, and slipped out on my bicycle.

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

After all, the Liberation Plant promised to fund fifteen 100-ton kings.

If a driver changes fifteen 100-ton kings, our rolling mill will not suffer.

-----------------

Out of the rolling mill, the sun was shining outside.

The people who hurried up and down the streets, although they were thin and dressed plainly, their faces were filled with the spirit that was scarce in later generations.

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

That is to build a weak country that is poor and white into a prosperous and powerful country with big muscles.

The task is arduous and glorious, 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 the pedals suddenly increased.

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

It takes more than ten years of study for ordinary people to be able to do it.

But for Li Weidong, who has 10,000 times more experience, it may only take one morning.

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

"You see, the comrade who borrowed more than 30 books at a time is here again."

"Ahem, Comrade Weidong, our library has a rule, in order to ensure that residents can borrow books, each person can borrow a maximum of five books at a time."

「....... What's new?"

"It was decreed the day before yesterday." The little librarian swallows and foams.

There was no way, last time Li Weidong borrowed all the books on automobiles in the library, which provoked the old comrades who came to consult the materials to be furious.

"Can I read here?"

"There are no restrictions on reading books, as long as you don't take them out of the library."

"Thank you then!"

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

Li Weidong was also helpless.

Isn't it just that in a month's time, I received more than 200 books on automobiles in a row, and I need to revise the system?

Fortunately, solar cells are simpler than car turf, and the number of related books is also small, so you can read them in the library.

With my library card in hand, I went to the 'Science and Technology Zone' according to the classification instruction card hanging on the roof.

Most of them are old comrades in gray tunics with gray hair.

A young man in overalls like him is unique in this film. ….

Principles of Optoelectronic Design, Circuit Construction......

Looking for books from bookshelves to shelves, in just ten minutes, Li Weidong hugged a large number of books.

"Maxwell's Equations in Detail (Russian Edition)", good thing, hold on!

Reaching out to take the book, a delicate face appeared on the opposite side.

"Huh? Driver Li, are you here to borrow books too? It's all physics.....

Ran Qiuye saw Li Weidong hugging a lot of books, a little bit

Startled.

Li Weidong's body moved, and the book in his arm was a little loose: "Don't stand, hurry up and help."

"Uh-uh..."

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

His eyes fell on the dozen or so thick books, and Ran Qiuye felt that his little head was not enough.

Is an old driver learning Maxwell's equations?

By the way, listening to the stick terrier's mother, 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 like that.

Comrade Li Weidong, the driver, did not forget his original intention, and in addition to hard work, he studied diligently and self-taught, and finally....

Ran Qiuye had unconsciously 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 little face flushing for a while, and then turning white.

It seems impolite not to say anything at this time.

But if you say something, it doesn't seem right.

"Together?"

"Okay..."

Ran Qiuye broke free from the embarrassment and hurriedly sat down to cover his face with "People's Pictorial".

Immediately, he realized that something was wrong and put down the "People's Pictorial".

Li Dong saw a few clues, and said with a smile: "Teacher Ran, there are many good articles in the pictorial, you must want to copy them and read them to the children, right?"

It's a blessing for children to have such a good teacher as you."

"Ahh Yes, yes, I didn't expect you to guess it." Ran Qiuye hurriedly took out a pen and paper from his canvas pocket.

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

Yes, yes, I'm a math teacher!

.......

With the blessing of 10,000 times the experience, it only took one morning for Li Weidong to master the knowledge needed to make solar panels.

It can be said that now his attainments in physics can be Hu Guangliang's teacher.

Stretching a comfortable waist, he looked at Ran Qiuye, who was still copying articles: "Teacher Ran, the library is about to get off work, let's go back?"

"Good, good."

Ran Qiuye shook his sore hand, looking at the thick notebook and was a little speechless.

What did I do all morning?

........

"Goodbye, Teacher Ran!"

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

Yu Guang caught a glimpse of Ran Qiuye squatting on the ground, and he turned around again.

"What's wrong?"

「..... The chain is off."

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

At this time, dense sweat was already oozing from Ran Qiuye's forehead.

For fear of staining her new clothes, she could only pick up the bicycle chain with a wooden stick, but she couldn't pick it up several times. ….

For an old driver who often repairs his car, repairing a bicycle is a matter of holding the handlebar.

Li Weidong took the wooden stick, dialed a thousand catties in four or two, and gently picked it up, and the chain returned to the chainring.

"Come on, you try."

Ran Qiuye obediently rode on the bicycle, and Li Weidong gave orders next to him.

"Kick."

「..... I can't move."

"Hard."

「..... I can't push even hard."

"Push hard."

"Click.....

The bicycle chain broke in two, like a soft water pipe, and fell on the dusty ground.

Ran Qiuye: ......

Li Weidong: ......

I really didn't expect it, this sister-in-law

The mother is delicate, and her strength is quite big.

There are no garages near the library, and the nearest garage is three or four miles away.

Let a little girl push a bicycle so far, Li Weidong's heart can't be happy.

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

Untie the rope from the saddle and tie one end to the rear bar of the bicycle and the other end to the front of the Ran Qiuye bike.

"Ready? I'm going to start."

"Okay, you slow down."

Li Weidong gently pedaled, "Go you", and the bicycle slowly drove forward.

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

The owner of the car repair shop, surnamed Liu, wears a thin yellow-brown coat and yellow clay shoes in winter, and also wears the broken straw hat in the house, and is not afraid of becoming bald.

Although the personality is quirky, the craftsmanship is good, the price is also very fair, and it only costs five cents to repair the chain.

"Thank you so much today. I don't know what I would have done if it weren't for you."

"I am also responsible for this matter, so naturally I am responsible, you are welcome."

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

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

"Rub."

"How embarrassing is this.....

Before he finished speaking, Ran Qiuye got on his bicycle and left, looking at the figure that did not enter the crowd, Li Weidong stuffed the handkerchief into his pocket.

"Comrade boss, do you have any soap?"

-----------------

The capital, in the grove outside the ministry compound.

Hu Guangliang looked at the barren scene around him, felt a little frightened, gathered his clothes, and walked quickly behind a majestic figure.

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

"Don't you think there's a bad thing vibe here?"

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

".........." Hu Guangliang swallowed and foamed, and asked cautiously, "Aren't you preparing solar panels early.....

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

That look was extremely nervous.

The tone was extraordinarily low.

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

It's exactly like the people on TV who do bad things. ….

「...... Brother, have you watched too many enemy movies lately?"

"You've seen it.....

「.....」

In this day and age, what man doesn't want to catch the enemy?

Hu Guangliang looked at the note, shook his head and said, "The materials on it are easy to get, I'll just help you open a letter of introduction." Just, toothpaste? Are you sure this thing works?"

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

However, toothpaste is for brushing teeth, so how can equipment be made?

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

Hu Guangliang's eyelids raised: "Calcium carbonate, dicalcium phosphate, silicon dioxide, aluminum hydroxide..... Silica!"

His eyes widened with excitement, he walked around the fallen leaves with his hands behind his back, and muttered to himself, "Silica is a kind of polycrystalline silicon that produces a photovoltaic effect, when light hits the surface of silica, a part of the photons are absorbed by the silicon material; The energy of the photon is transferred to the silicon atom, so that the electron undergoes a migration, becoming free electrons and accumulating on both sides of the P-N junction to form a potential difference

output power."

"Wonderful! It's wonderful! Compared to Bell Labs' monocrystalline silicon solar cells, the cost of silica is lower."

Li Donglai nodded: "Not only is the cost low, if a small hole of micron size is etched on the silica sheet and a silica photonic crystal coating material is designed, the efficiency of photoelectric conversion can be greatly improved. I've calculated that the solar panels made in this way will have a conversion efficiency of 80%."

"80% ......," Hu Guangliang's eyes widened suddenly.

As a university graduate dedicated to the study of science and technology, although he worked in the ministry, he did not give up the study of cutting-edge technology.

Especially in ministries, qualified to access foreign academic journals.

Bell Labs has been touted as having solar panels that are enough to change the status quo of human energy, and their conversion efficiency is less than 30 percent.

Conversion efficiency is the proportion of solar energy converted into electrical energy.

The higher the efficiency, the more electricity a solar panel with the same surface area will produce.

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

Now that we realize that solar cells may be really promising.

Working in ministries and commissions, Hu Guangliang has a deeper understanding of the current situation of domestic energy than ordinary people.

Most of the equipment for domestic power plants is imported from abroad, which is not only small in quantity, but also often has problems.

Energy is extremely scarce, and even in the capital, there are frequent power outages. Not to mention the vast rural areas, where 80 percent of the places have no electricity at all.

Not to mention industrial production, when planning factories, ministries must first consider whether electricity can support them.

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

If it can really be successfully developed, it will certainly be a great thing for the benefit of the country and the people.

Thinking about this, Hu Guangliang immediately returned to the ministry and helped Li Weidong write a letter of introduction needed to purchase materials. ….

Of course, these materials are very common chemical materials, which are not dangerous and do not violate any regulations.

.......

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

Yu Li grabbed the double-layer capacitor and asked curiously, "Brother Wei Dong, what is this round thing, it seems to be bigger than the semiconductor in the radio?"

"It's like semiconductors, it's used to stabilize voltage."

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

After the lines are dry, ask Yu Li to help clean the copper sheet with alcohol.

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

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

"It should be about the same now, let's go to the compound and try it."

Li Weidong came to the door with a copper plate and a lampholder.

Now I have just finished lunch, the sun is shining outside, and the residents are carrying stools to warm up outside.

The adults gossip, the children chase and fight, and the hustle and bustle is full of the fireworks of life.

The copper plate and lampholder quickly attracted the attention of the residents.

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

.......

East to east