Low-bandgap, monolithic, multi-bandgap, optoelectronic devices
First Claim
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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Accused Products
Abstract
Low bandgap, monolithic, multi-bandgap, optoelectronic devices (10), including PV converters, photodetectors, and LED'"'"'s, have lattice-matched (LM), double-heterostructure (DH), low-bandgap GaInAs(P) subcells (22, 24) including those that are lattice-mismatched (LMM) to InP, grown on an InP substrate (26) by use of at least one graded lattice constant transition layer (20) of InAsP positioned somewhere between the InP substrate (26) and the LMM subcell(s) (22, 24). These devices are monofacial (10) or bifacial (80) and include monolithic, integrated, modules (MIMs) (190) with a plurality of voltage-matched subcell circuits (262, 264, 266, 270, 272) as well as other variations and embodiments.
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Citations
12 Claims
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1. A monolithic, integrated, module (MIM), comprising:
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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; anda 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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A monolithic, multi-bandgap, photovoltaic converter comprising:
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a first subcell with a first bandgap and a first lattice constant; 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; 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 substrate with a substrate bandgap and a substrate lattice constant, said substrate being positioned between the first subcell and the lattice constant transition material, 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. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification