Dong Gong said: "The solar power generation site is coming soon."
Yonghan said: "It seems that this place is quite close to the solar farm. Go in from the basement of the site to check the cables."
The solar power generation site has 600 acres of land. Dozens of neat rows of solar panels detect illumination through illumination sensors and automatically track the strongest illumination angle.
Some of the light energy conversions are photoelectric conversions and some are photothermal conversions. Photoelectric conversion is the conversion of light energy into electrical energy, which is used in power equipment and household appliances. Photothermal conversion is the conversion of solar energy into thermal energy, such as heating and solar water heaters.
Light is directed to the P region of the photovoltaic cell, and electron-hole pairs are excited in the near-surface layer. The electrons will diffuse to the PN junction region and be pulled to the N region by the junction electric field; at the same time, holes will also rely on diffusion and the junction electric field to enter. P zone. Photons may also penetrate the P region and reach the N region, where they excite electron-hole pairs; after these photogenerated carriers are separated by the junction electric field, holes flow into the P region and electrons flow into the N region, creating potential barriers on both sides of the junction region. . This is the photovoltaic effect. The photogenerated electric field is directed from the p end
end, lowering the potential barrier and generating a forward current; since the holes move toward the p-region, so in the p-
The knot is formed internally from
Photoinduced current from area to p area.
Dong Gong said: "It is good to use solar and wind energy to generate electricity here. There is no danger of solar energy depletion and it is absolutely clean. It is not restricted by geography and can generate electricity near the oasis city." However, in order to popularize solar power generation, firstly, the efficiency of solar photoelectric conversion must be improved. And reduce costs; the second is to realize the interconnection of solar power generation with the current power grid.
Yonghan said: "When solar energy is connected to the grid, it will have an impact on the grid, such as changes in voltage and current, and the generation of harmonics. Electric energy must be transmitted while ensuring the quality of the original grid."
Dong Gong said: "Oasis City has backup batteries. There is Fushu City near Oasis City. There is a power plant there to provide part of the power."
Silicon solar cells include monocrystalline silicon solar cells, polycrystalline silicon solar cells, and amorphous silicon solar cells.
The highest conversion efficiency of monocrystalline silicon solar cells in the laboratory is close to 25%, while the efficiency of large-scale production of monocrystalline silicon solar cells is 17%. Polycrystalline silicon: When molten elemental silicon solidifies under supercooling conditions, the silicon atoms are arranged in the form of a diamond lattice into many crystal nuclei. If these crystal nuclei grow into crystal grains with different crystal plane orientations, these crystal grains combine to form crystals. into polysilicon.
Polycrystalline silicon semiconductor material is relatively cheap, but it has many weaknesses due to the presence of many grain boundaries. The maximum laboratory conversion efficiency of polycrystalline silicon solar cells is 18%, and the conversion efficiency of industrial-scale production is 16%. Amorphous silicon: A form of elemental silicon. Brown-black or gray-black microcrystals. Silicon does not have a complete diamond unit cell and is not very pure. The melting point, density and hardness are also significantly lower than crystalline silicon.
Amorphous silicon thin-film solar cell modules are manufactured using thin-film technology, which has many advantages, such as low deposition temperature, low-cost substrate materials, and the ability to achieve large-area deposition. The visible light absorption coefficient of amorphous silicon is larger than that of monocrystalline silicon, which is 40 times that of monocrystalline silicon. A 1-micron-thick amorphous silicon film can absorb about 90% of useful solar energy. Amorphous silicon solar cells have poor stability, which has affected their rapid development.
Here it is using perovskite solar panels. In the perovskite crystal, the A ion is located in the center of the cubic unit cell and is surrounded by 12 X ions to form a coordination cuboctahedron with a coordination number of 12; the B ion is located at the corner top of the cubic unit cell and is surrounded by 6 X ions. Surrounded by a coordination octahedron, the coordination number is 6. Perovskite solar cells have obvious advantages in conversion efficiency and the manufacturing process is relatively simple. The cost of power generation is lower than thermal power generation. Combined with silicon panels, it can create a series cell with an efficiency of 30%.
They entered from the middle room, opened the door through the fingerprint lock, and walked to the basement passage. Look for cable breaks.
"The security here is very tight, no one else will break in. There are also cameras."
Walking along the cable duct for a distance, I saw that the stone wall next to it was knocked open and the pipe was also damaged in two parts.
"How big of a snake does it have to be to break through the stone wall?" Yonghan said.
"It's not an ordinary python, it may be a wild snake. It's a very ancient species. I heard it existed tens of thousands of years ago. There is this legend in Oasis City."
Driving back to Oasis City, the setting sun reflected on the road in the evening. I saw a huge figure rushing out of the sand sea and falling back again.
Oasis City lacks power and suffers short-term power outages.
"Bang!" Jingsi heard a gunshot.
"It's in the experimental field."
Everyone ran to the experimental field and saw a person running away covering his arm, with a little blood flowing on the ground. These people ran away on motorcycles. Several other people drove off in SUVs and seemed to have shotguns.
"What's going on? A gunfight in the experimental field? Are they robbers?" Dai said.
"They're desert car thieves. They appear occasionally." Jingsi said.
"Who is injured? Is anyone injured?" Dai asked.
"No." The staff at the Biological Research Institute looked at each other and shook their heads.
"Then let's see what's missing?" Jingsi said.
"Without the anxiang fruit, we're looking at the seedlings of the water plant!" Lei Ling said.
"They are still eyeing these things." Jingsi suddenly realized.
The equipment for riding a motorcycle is simple. The one driving the off-road vehicle was wearing high-end equipment and was carrying a shotgun. Jing Si thought, they took advantage of the power outage in Oasis City. There was no power protection network or monitors, and thieves came in to steal the anxiang fruit. Anxiang fruit is a succulent plant and is an extremely scarce ingredient in the eyes of thieves. They steal it and sell it in the market. Desert car thieves also came in to spy on the seedlings of water plants.
Jingsi estimated that they were not looking for water sources using water-seeking plants, but for liquid mines.
When Yonghan came back, he saw many people gathered near the experimental field and asked what happened.
Jingsi said: "The desert car robbers came to spy on the seedlings of the water plants. The thieves came in to steal the anxiang fruits. The car robbers injured one of the thieves. Now they are all running away."
Yonghan said: "Is this seedling important? Do you want to chase it?"
Jingsi said, "It's important. We rely on them to absorb water and fix sand. But there are other experimental fields."
Yonghan said: "Why are they robbing this?"
"Oh, everything is sold for money." Jingsi said.
"Originally, the Anxiang fruit was grown as a succulent plant, and the water-seeking plant was used to absorb water and fix sand. Now you see, it was stolen from cars and sold for money... What is the original intention of our research? It is to study the laws of nature, science, and technology. Benefiting mankind and serving society. Now it is snatched away by unscrupulous and profit-seeking people. We create things, but the things we create cannot be controlled by ourselves, and the uses are not our original intentions. I want to change the world, but I am still being changed by the world .”
Yonghan said: "It's nothing, don't despair, we are determined people. These are small things, we will find them, and people can find them."
In a Gobi cave, the car thief parked the off-road vehicle. Ju said: "Boss, this is the water-exploring plant that was snatched back. What's the use of it?"
Xie said: "It is used to detect liquid mines. The devices made from liquid mines have good sand-proofing capabilities and can be sold at a high price."
