Back contact device for photovoltaic cells and method of manufacturing a back contact device
First Claim
1. A method for fabricating an all-back contact photovoltaic cell, said method including:
- depositing a semiconductor layer on a non-opaque substrate;
increasing a level of crystallinity of said semiconductor layer by exposing said semiconductor layer to a focused beam of energy;
doping said semiconductor layer with first and second dopants on a side of said semiconductor layer to create at least two doped regions in said semiconductor layer; and
providing electrical contacts to said doped regions by depositing a conductive layer on said side of said semiconductor layer so that said electrical contacts are on said side of said semiconductor layer and incident light strikes said semiconductor layer from an opposing side.
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Accused Products
Abstract
One or more embodiments of the presently described invention provide a method for fabricating an all-back contact photovoltaic cell. The method includes the steps of depositing a semiconductor layer on a non-opaque substrate, increasing a level of crystallinity of the semiconductor layer by exposing it to a focused beam of energy, doping the semiconductor layer with first and second dopants on one side to create at least two doped regions, and providing electrical contacts to the doped regions by depositing a conductive layer on the semiconductor layer so that the electrical contacts are on the same side of the semiconductor layer while incident light strikes the layer from an opposing side.
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Citations
25 Claims
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1. A method for fabricating an all-back contact photovoltaic cell, said method including:
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depositing a semiconductor layer on a non-opaque substrate; increasing a level of crystallinity of said semiconductor layer by exposing said semiconductor layer to a focused beam of energy; doping said semiconductor layer with first and second dopants on a side of said semiconductor layer to create at least two doped regions in said semiconductor layer; and providing electrical contacts to said doped regions by depositing a conductive layer on said side of said semiconductor layer so that said electrical contacts are on said side of said semiconductor layer and incident light strikes said semiconductor layer from an opposing side. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An all-back contact thin film photovoltaic cell including:
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a non-opaque substrate; a semiconductor layer deposited in at least one of an amorphous state and a microcrystalline state, wherein a level of crystallinity of said semiconductor layer is increased by exposing at least a portion of said semiconductor layer to one or more focused beams of energy; a capping layer deposited adjacent to said semiconductor layer, said capping layer etched a first time to expose a first set of areas of said semiconductor layer and a second time to expose a second set of areas of said semiconductor layer, wherein said first set of areas is doped with a first type of dopant and said second set of areas is doped with a second type of dopant; and a conductive layer deposited on a first side of said semiconductor layer opposite said substrate to provide electrical contacts with said first and second areas, wherein incident light passes through said substrate and strikes said semiconductor layer on a second side that is opposite said first side. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method for fabricating an all-back contact photovoltaic module, said method including:
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providing a semiconductor layer and a non-opaque substrate on a first side of said module; increasing a level of crystallinity of said semiconductor layer by exposing said semiconductor layer to one or more focused beams of energy; doping said semiconductor layer in each of a plurality of adjacent photovoltaic cells of said photovoltaic module with a first dopant in a first set of volumes in each of said photovoltaic cells; doping said semiconductor layer with a second dopant in a second set of volumes in each of said photovoltaic cells; removing a portion of said semiconductor layer to define a gap between said photovoltaic cells; depositing an insulating material in said gap; depositing a conductive material on said semiconductor layer at each of said first and second sets of volumes of each of said photovoltaic cells and on said insulating material; and etching said conductive material to create electrical contacts (a) to said first set of volumes for each of said photovoltaic cells, (b) to said second set of volumes for each of said photovoltaic cells and (c) between said first set of volumes in one of said photovoltaic cells and said second set of volumes in another one of said photovoltaic cells, wherein said electrical contacts are on a second side of said module that is opposite said first side and incident light passes through said substrate on said first side of said module and strikes said semiconductor layer. - View Dependent Claims (17, 18, 19, 20)
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21. An all-back contact photovoltaic module including:
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a plurality of photovoltaic cells each including a semiconductor layer and a non-opaque substrate on a first side of said module, each of said semiconductor layers including a first set of volumes doped with a first dopant and a second set of volumes doped with a second dopant, wherein a level of crystallinity of each of said semiconductor layers is increased by exposing said layers to one or more focused beams of energy; an insulating material located in one or more gaps between adjacent ones of said photovoltaic cells, said gaps created by removing one or more portions of said semiconductor material in said module; and a conductive material deposited adjacent to said first set of volumes and said second set of volumes for each of said cells and adjacent to said insulating material, said conductive material then etched to create electrical contacts (a) to said first set of volumes for each of said photovoltaic cells, (b) to said second set of volumes for each of said photovoltaic cells and (c) between said first set of volumes in one of said photovoltaic cells and said second set of volumes in another one of said photovoltaic cells; wherein said electrical contacts are on a second side of said module that is opposite said first side and incident light passes through said substrate on said first side of said module and strikes said semiconductor layer. - View Dependent Claims (22, 23, 24, 25)
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Specification