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Low-bandgap, monolithic, multi-bandgap, optoelectronic devices

  • US 9,231,135 B2
  • Filed: 05/22/2014
  • Issued: 01/05/2016
  • Est. Priority Date: 05/21/2002
  • Status: Expired due to Fees
First Claim
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1. A monolithic, integrated, module (MIM), comprising:

  • a plurality of monolithic, multi-bandgap, photovoltaic converters, each of which comprises;

    (i) a first subcell with a first bandgap and a first lattice constant;

    (ii) a second subcell with a second bandgap and a second lattice constant, wherein the second bandgap is less than the first bandgap and the second lattice constant is greater than the first lattice constant; and

    (iii) a lattice constant transition material positioned between the first subcell and the second subcell, said lattice constant transition material having a bandgap at least as large as the first bandgap and a lattice constant that changes from the first lattice constant to the second lattice constant; and

    a common substrate with a substrate bandgap and a substrate lattice constant, said common substrate being positioned between the first subcell and the lattice constant transition material of each of the monolithic, multi-bandgap, photovoltaic converters, wherein the substrate bandgap is at least as large as the first bandgap and the substrate lattice constant is equal to the first lattice constant.

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