Method of fabricating bifacial tandem solar cells
First Claim
1. A method of fabricating on a semiconductor substrate bifacial tandem solar cells with subcells, the method comprising:
- growing a lower bandgap subcell on one side of a substrate using non-phosphorous materials, the lower bandgap subcell comprising a bottom subcell and grading layers, the bottom subcell and the grading layers comprising a first periodic table group V material;
after said growing the lower bandgap subcell, flipping the substrate; and
after said flipping the substrate, growing higher bandgap subcells on an opposite side of the substrate, the higher bandgap subcells comprising a second periodic table group V material,wherein the lower bandgap subcell has a lower bandgap than a substrate bandgap and the higher bandgap subcells have a higher bandgap than the substrate bandgap.
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Abstract
A method of fabricating on a semiconductor substrate bifacial tandem solar cells with semiconductor subcells having a lower bandgap than the substrate bandgap on one side of the substrate and with subcells having a higher bandgap than the substrate on the other including, first, growing a lower bandgap subcell on one substrate side that uses only the same periodic table group V material in the dislocation-reducing grading layers and bottom subcells as is present in the substrate and after the initial growth is complete and then flipping the substrate and growing the higher bandgap subcells on the opposite substrate side which can be of different group V material.
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Citations
20 Claims
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1. A method of fabricating on a semiconductor substrate bifacial tandem solar cells with subcells, the method comprising:
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growing a lower bandgap subcell on one side of a substrate using non-phosphorous materials, the lower bandgap subcell comprising a bottom subcell and grading layers, the bottom subcell and the grading layers comprising a first periodic table group V material; after said growing the lower bandgap subcell, flipping the substrate; and after said flipping the substrate, growing higher bandgap subcells on an opposite side of the substrate, the higher bandgap subcells comprising a second periodic table group V material, wherein the lower bandgap subcell has a lower bandgap than a substrate bandgap and the higher bandgap subcells have a higher bandgap than the substrate bandgap. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of fabricating on a semiconductor substrate bifacial tandem solar cells with subcells, the method comprising:
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growing higher bandgap subcells on one side of a substrate, the higher bandgap subcells comprising at least one periodic table group V material; after said growing the higher bandgap subcells, flipping the substrate; and after said flipping the substrate, growing a lower bandgap subcell on an opposite side of the substrate using non-phosphorous materials, the lower bandgap subcell comprising a bottom subcell and grading layers, the bottom subcell and the grading layers comprising at least one periodic table group V material, wherein the lower bandgap subcell has a lower bandgap than a substrate bandgap and the higher bandgap subcells have a higher bandgap than the substrate bandgap. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification