Researchers at the University of Pennsylvania have found a way to
harvest energy from sunlight more efficiently, with the help of
so-called plasmonic nanostructures. The new findings suggest that
plasmonic components can enhance and direct optical scattering, creating
a mechanism that is more efficient than the photoexcitation that drives
solar cells. The development could therefore provide a real boost to
solar cell efficiency and lead to faster optical communication.When photons hit the surface of a solar cell, the energy they carry is absorbed by the atoms of a doped semiconductor. If the energy absorbed is higher than a set threshold, known as the energy gap, then electrons are set free and can be used to generate electricity.
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