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Photovoltaic cells

  • US 20080230112A1
  • Filed: 03/25/2008
  • Published: 09/25/2008
  • Est. Priority Date: 09/26/2005
  • Status: Abandoned Application
First Claim
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1. A photovoltaic system comprising:

  • (a) a photovoltaic device comprising;

    a lower photovoltaic cell fabricated from semiconductor material having a first bandgap and having first electrical contacts for extraction of current from the lower cell;

    an electrically insulating layer monolithically fabricated on the lower photovoltaic cell; and

    an upper photovoltaic cell monolithically fabricated on the electrically insulating layer from semiconductor material having a second bandgap larger than the first bandgap and having second electrical contacts for extraction of current from the upper cell;

    (b) one or more first photon sources operable to supply photons to the photovoltaic device, the photons having wavelengths in a first wavelength range associated primarily with the first bandgap; and

    (c) one or more second photon sources operable to supply photons to the photovoltaic device, the photons having wavelengths in a second wavelength range primarily associated with the second bandgap.

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