US scientists invented ultra-thin photovoltaic cells

Scientists from MIT have recently invented a photovoltaic cell that is thin, light and flexible. It is light and plump, and can even be placed on foam. This thin battery can be placed anywhere, from smart clothing to helium balloons.

One of the researchers, who came to MIT's Vladimir Bulovi, said: "It's so light, if you put it on your clothes or laptop, you don't even feel it exists. These batteries can be used as an easy extension of existing equipment. ."

The exciting part of this experiment is the versatility of this battery, even though it is still in the proof of concept phase. The key to making this new type of battery is that researchers have combined the battery, substrate and protective layer into a single process.

One of the advantages of doing this is that by making batteries and substrates together, the latter can be protected from dust intrusion and other contamination. A flexible polymer called parylene is used as the substrate and coating, and an organic material called dibutyl phthalate (DBP) is used as the main light absorbing layer.

Unlike traditional solar cell manufacturing processes, this entire process was performed in a room-temperature vacuum chamber without the use of any chemical solvents or irritating chemicals. Vapor deposition techniques, that is, heat, pressure, and chemical reactions to form extremely thin coatings on special materials are used to fabricate batteries and substrates at the same time.

The MIT team said that making this breakthrough seem extremely important is the technology itself, not the materials used.

The ultra-light flexible batteries thus produced are only one-fifth the thickness of human hair, which is one thousandth of the current thickness of glass-based batteries (about one micron), but their efficiency in converting sunlight into electricity is equally high.

In fact, they are a bit too thin. Another researcher, Joel Jean, said: "If you breathe too hard, you'll blow it off."

According to the inventor, they spent several years perfecting the vacuum substrate process to cover solar cells on fabrics, paper or almost all materials.

In space or at high altitudes, where weight is critical, these batteries can play an important role, even if large-scale production currently takes some time.

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