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11-27-2012, 01:00 PM
  #39
McOilbleeder
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http://phys.org/news/2012-11-harness...capturing.html

Quote:
In this case, the "funnel" is a metaphor: Electrons and their counterparts, holes—which are split off from atoms by the energy of photons—are driven to the center of the structure by electronic forces, not by gravity as in a household funnel. And yet, as it happens, the material actually does assume the shape of a funnel: It is a stretched sheet of vanishingly thin material, poked down at its center by a microscopic needle that indents the surface and produces a curved, funnel-like shape. The pressure exerted by the needle imparts elastic strain, which increases toward the sheet's center. The varying strain changes the atomic structure just enough to "tune" different sections to different wavelengths of light—including not just visible light, but also some of the invisible spectrum, which accounts for much of sunlight's energy.

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