Integration of epitaxial lift-off solar cells with mini-parabolic concentrator arrays via printing method
First Claim
1. A non-destructive method for performing an epitaxial lift-off, comprising:
- providing a growth substrate;
depositing at least one protection layer on the growth substrate;
depositing at least one sacrificial layer on the protection layer;
depositing a photoactive cell on the sacrificial layer;
depositing a metal mask on the at least one photoactive cell;
performing a first etch step through said metal mask to form a pattern in the photoactive cell, wherein said pattern extends to the sacrificial layer;
bonding the photoactive cell to a host substrate comprising an elastomeric material; and
removing the sacrificial layer with one or more second etch steps.
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Abstract
There is disclosed a method of preparing a photovoltaic device. In particular, the method comprises integrating epitaxial lift-off solar cells with mini-parabolic concentrator arrays via a printing method. Thus, there is disclosed a method comprising providing a growth substrate; depositing at least one protection layer on the growth substrate; depositing at least one sacrificial layer on the protection layer; depositing at least one photoactive cell on the sacrificial layer; etching a pattern of at least two parallel trenches that extend from the at least one photoactive cell to the sacrificial layer; depositing a metal on the at least one photoactive cell; bonding said metal to a host substrate; and removing the sacrificial layer with one or more etch steps. The host substrate can be a siloxane, which when rolled, can form a stamp used to integrate solar cells into concentrator arrays. There are also disclosed a method of making a growth substrate and the growth substrate made therefrom.
9 Citations
49 Claims
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1. A non-destructive method for performing an epitaxial lift-off, comprising:
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providing a growth substrate; depositing at least one protection layer on the growth substrate; depositing at least one sacrificial layer on the protection layer; depositing a photoactive cell on the sacrificial layer; depositing a metal mask on the at least one photoactive cell; performing a first etch step through said metal mask to form a pattern in the photoactive cell, wherein said pattern extends to the sacrificial layer; bonding the photoactive cell to a host substrate comprising an elastomeric material; and removing the sacrificial layer with one or more second etch steps. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A growth structure for epitaxial lift-off, comprising:
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a growth substrate; at least one protection layer on the growth substrate; at least one sacrificial layer on the protection layer; at least one photoactive cell on the sacrificial layer; at least one pattern that has been etched from the photoactive cell to the sacrificial layer, wherein the etched pattern comprises two or more parallel trenches; and at least one metal disposed on the photoactive cell, wherein the at least one metal is bonded to a host substrate comprising an elastomeric material. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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27. A method of preparing a photovoltaic device structure comprising:
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providing a growth substrate; depositing at least one protection layer on the growth substrate; depositing at least one sacrificial layer on the protection layer; depositing at least one photoactive cell on the sacrificial layer; depositing at least one metal on the at least one photoactive cell; etching a pattern of at least two parallel trenches that extend from the at least one photoactive cell to the sacrificial layer, wherein said etching causes the surface of the structure to form alternating trenches that extend to the sacrificial layer and plateaus that comprise said photoactive cells; and bonding the photoactive cells located on the plateaus to a host substrate comprising an elastomeric material. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49)
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Specification