Spray-on Solar Goes Double-decker

A Canadian research team  has created the first two-layer solar cell made up of light-absorbing nanoparticles called quantum dots, which can be tuned to absorb different parts of the solar spectrum by varying their size. Such quantum dots have been seen as a promising route to low-cost solar cells because the particles can be sprayed onto surfaces much like paint. But cells based on this technology have been too inefficient to be practical. By discovering a way to combine two different types of quantum dots in a solar cell, the researchers could open the way to making such cells much more efficient.

Source: MIT Technology Review, 1 July 2011

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