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Ultrathin solar cells on soap bubbles
Hats, windows, white paper, balloons, if they all can generate electricity, what would happen? Scientists at the Massachusetts Institute of Technology have developed an ultra-light, ultra-thin flexible solar cell that can adhere to many objects. Even if you “lie†on a soap bubble, you won't deform the bubble. The material has great potential and is of great value for applications that are more sensitive to weight, such as spacecraft or high-altitude sounding balloons, and is expected to open up many new fields for solar cell applications.
According to the Massachusetts Institute of Technology, this type of solar cell is mainly composed of a substrate and a coating. Its thickness is only 2 microns, which is equivalent to one-fifth of the human hair diameter. One thousandth of a traditional solar cell is very likely. It is the lightest and thinnest solar cell ever. Vladimir Vilavik, a professor of electrical engineering at the Massachusetts Institute of Technology who is in charge of the study, said: "This type of battery is light. If you integrate it into your shirt or laptop, you can't even feel it. The presence."
Bilavick said that the leading position of this technology is to complete the manufacturing of all parts in one step. Since no other processes are required, the chances of the electronic components being exposed to dust and other contaminants are reduced, ensuring the quality and performance of the product. At the same time, the simplification of the production process also offers possibilities for large-scale production.
The research team of Vilavik has verified this idea and created a prototype in the laboratory. They used Parylene (Parylene), a common flexible polymer, as a base and coating for solar cells, and a light-absorbing layer with another material called DBP (dibutyl phthalate). The entire manufacturing process takes place in a vacuum chamber at room temperature without any solvent. Compared with traditional solar cells, there is no need for high temperatures and toxic chemicals. In a vacuum chamber, the substrate and solar cells can be "grown" by vapor deposition techniques.
This kind of solar cell can use traditional glass as carrier, but also can use fabric, paper, plastic and other materials. Although the conversion efficiency of the new device is not very high at present, because of its light weight, the power to weight ratio is sufficient to dominate the world. A typical silicon-based solar cell module, glass accounted for a large part of the total weight, can produce 15 watts of electricity per kilogram, while the new thin-film solar cells can generate 6 watts of electricity per gram, 600 times higher than the former . (Reporter Wang Xiaolong)
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