I want to study the effect of temperature on the efficiency of solar cells. So, I needed solar cells in the form of a hollow cylinder to run a stream of water in it. How can I get it and from where?
why don't you take regular flat solar cells and put them on a flat rectangular channel?
Do you want to manufacture it? You may instead form the shape of your choice using flexible thin film cells, but beware that an inherent shading will result from the cylinder shape. The known effects of temperature on cell performance can be assessed by controlling the temperature of a regular cell.
Dear Sabry
See this site:
https://m.made-in-china.com/product/72W-Rolled-up-Flexible-Solar-Panels-with-Triple-Junction-Amorphous-Silicon-Solar-Cell-694080452.html
Hope that help you
If you want to study the effect of temperature on the efficiency of solar cells and only the effect of temperature on the efficiency, then all other factors that can influence the efficiency measurement have to be stabilized as good as possible in order to minimize their influence -- because otherwise you would have to be in doubt that the observed behavior is due to the temperature variation only.
Reliable efficiency measurements are really tricky, because the illumination has to be very homogeneous in order to avoid internal balancing currents that would lower the efficiency. Since this is not easy to acheive for flat solar cells already, what do you expect this effort to be like for solar cells in the form of a hollow cylinder?
Solyndra is now churning out copper-indium-gallium-selenide (CIGS) thin-film solar cells, wrapped into a cylindrical shape and encased in glass. This design not only seals out moisture but allows the glass to act as a sunlight concentrator, funneling photons onto the thin film, according to Gronet. He says the Fremont plant, which opened in the spring, will ultimately be capable of producing 110 megawatts worth of solar cylinders annually.
The company says that the solar cylinders—paired with a roof painted white to better reflect sunlight—can collect 20 percent more sunshine than their conventional flat counterparts. The estimate is based on 50 kilowatts worth of the tubular cells that the company installed on its own roof.
As it stands, Solyndra's CIGS solar cells convert as much as 14 percent of the sunlight that hits them to electricity and, all told, Gronet expects that a Solyndra system will deliver twice as many kilowatt-hours of electricity from a given rooftop.
Source (https://www.scientificamerican.com/article/cylindrical-solar-cells-give-new-meaning-to-sunroof/)
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