Method and means for a high power solar cell
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United States of America Patent
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Jun 12, 2012
Grant Date -
Dec 16, 2010
app pub date -
Jun 1, 2010
filing date -
Jun 10, 2009
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Abstract
In methods and apparatus for improving the power generated, and thus efficiency of solar cells, a double or triple junction tandem solar cell that has one or two photon filters of the invention in between the solar cell layers, respectively. The photon filter is arranged to reflect photons with wavelength shorter than λx and arranged to be transparent to photons of wavelength longer than λx by focussing the lower energy photons out of small area apertures on the other side of the photon filter and arranging the other side of the photon filter to reflect at least some of the photons of wavelength longer than λx. By using the photon filters of the invention in between the solar cell layers, photons can be trapped between filters to solar cell layers at an energy at which the quantum efficiency of the solar cell layer is the best.
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