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Los Alamos National Laboratory uses quantum dot coatings to convert ordinary glass into solar panels.
The American Los Alamos National Laboratory official website reported on the 12th that the laboratory's research team of the Advanced Solar Photonics Center has obtained certain solar energy conversion efficiency by spraying thin layer quantum dots onto ordinary glass so that it can be used in buildings. Glass windows become low-cost photovoltaic power generation systems.
People always try to capture solar energy that falls on a window by using multiple connected solar cell modules. “The use of a solar cell that uses a mechanism to send captured sunlight directly to the edge of the window not only greatly simplifies the device, but also lowers the cost. Now we have done it.†Victor Kemer, a nanotechnology engineer who led the study. Said.
The Klimov team found that an ultra-thin quantum dot coating can transform ordinary glass into a solar panel and maintain its functionality for up to 14 years, and that the energy conversion efficiency is now as high as 1.9%, although it is practically required 6 There is still a gap of %, but they can reach this goal very quickly. In addition, it is very easy to spray quantum dots on the window glass. It is only necessary to apply a slurry of quantum dots and PVP polymer onto the glass and spread it into a thin layer with a doctor blade.
The quantum dots used by the Klimov team contained a cadmium arsenide core and a cadmium zinc-sulfur shell and were covered with a layer of silica to prevent oxidation of the shell layer and loss of light absorption. When the sun photon encounters a quantum dot, electrons in the shell transition from the covalent band to the conduction band, leaving holes behind. Electrons and holes jump to the core at the same time, where they re-aggregate to form photons. In the design, they allow the shell to absorb only high-energy photons so that new photons can be easily transmitted by internal reflections to the entire glass and quantum dot layer, eventually to the edge of the glass and absorbed by the solar cells there.
The researchers said that new research has demonstrated that quantum dots and other nanocrystals can be used to make large-area, cost-effective devices for collecting scattered light sources. Tests on light absorption and stability also show that such devices are comparable to other solar cells. Not inferior. These coatings can also be recycled and reused. Glass is also readily available. It is the first choice for high-rise buildings where the roof does not have enough space to install solar panels. They will continue to adjust the quantum dot concentration in order to improve the light absorption characteristics and conversion efficiency, so that they can be put into use as soon as possible. (Reporter Nie Cuirong)
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