At Delft University of Technology (DUT) researchers have been able to increase the efficiency of ultrathin crystalline silicon solar cells. They have developed an advanced metal-free light trapping scheme for crystalline silicon wafers. A nano-texture known as black-silicon has been applied at the front side of the silicon wafers. A random pyramidal texture coated with a photonic Dielectric Back Reflector (designed to exhibit maximal and omni-directional internal reflectance) has been implemented at the rear side. The result: absorption up to 99.8% of the theoretical classical absorption limit in the broad light spectrum from 400 to 1200 nm can be achieved. More info at DUT.
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