Nanotube funnels concentrate sunlight on solar cells
Carbon nanotube ‘funnels’ concentrate the light striking their surface and convey it to the solar cell. The light funnels consist of fibrous ropes approximately 10 µm long and 4 µm thick, made up of around 30 million carbon nanotubes. The nanotubes in each rope are arranged in two layers with different electrical properties: the nanotubes in the inner layer have a smaller bandgap than the nanotubes in the outer layer. Consequently, excitons produced when photons in sunlight strike the outer layer of the funnel are concentrated in the inner layer.
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