HOT SOLAR CELLS

![hotsolar4blackcarbonnanotube.jpg]( nanotubes sit on top of the absorber-emitter layer, collecting energy across the solar spectrum and converting it to heat.

Black The absorber-emitter layer is situated above an optical filter and photovltaic cell, which is visible underneath.

Concentrated light from a solar simulator shines through the window of a vacuum chamber, where it reaches the solar thermophotovoltaic device and generates electricity.