Double-decker solar cell

By Davide Castelvecchi, 15:57 PM April 15, 2008

Researchers have created a two-layer solar cell that's the most efficient yet among cells made of organic materials. It's essentially a two–solar cell sandwich with a transparent film in the middle. The top layer picks up the higher-energy photons from the blue part of the spectrum. Most of the lower-energy photons make it unscathed through both the first cell and the film. The bottom layer is optimized for absorbing photons in the lower-energy, red part of the spectrum.

Together, the layers ...

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