Back Contact Solar Cell with Organic Semiconductor Heterojunctions
First Claim
1. A method for fabricating a back contact solar cell with organic semiconductor heterojunctions, the method comprising:
- providing a substrate made from a first semiconductor of silicon lightly doped with a first dopant type having a first majority carrier, the substrate having a topside and a backside;
texturing the substrate topside;
forming a second semiconductor layer overlying the first semiconductor substrate topside, made from hydrogenated amorphous silicon (a-Si;
H) and doped with the first dopant;
forming an antireflective coating overlying the second semiconductor layer;
forming a third semiconductor layer overlying the first semiconductor substrate backside, made from intrinsic a-Si;
H;
forming a first majority carrier type organic semiconductor layer overlying the third semiconductor layer inn a first pattern, where the first pattern includes channels in the first majority carrier type organic semiconductor exposing the underlying third semiconductor layer;
forming a second majority carrier type organic semiconductor layer in a second pattern overlying the third semiconductor layer in the first majority carrier type organic semiconductor pattern channels, where the second majority carrier is opposite in polarity to the first majority carrier, and where the second pattern of second majority carrier type organic semiconductor incompletely fills the channels in the first majority carrier type organic semiconductor, forming spaces between the first majority carrier type organic semiconductor layer and the second majority carrier type organic semiconductor layer, exposing the third semiconductor layer;
forming a dielectric organic semiconductor layer overlying the first majority carrier type organic semiconductor layer and the second majority carrier type organic semiconductor layer, filling the spaces, with openings exposing the first majority carrier type organic semiconductor layer and the second majority carrier type organic semiconductor layer that respectively form first and second organic semiconductor contact regions;
forming a first metal grid connected to first organic semiconductor contact regions; and
,forming a second metal grid connected to second organic semiconductor contact regions.
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Accused Products
Abstract
A back contact solar cell with organic semiconductor heterojunctions is provided. The substrate is made from silicon lightly doped with a first dopant type having a first majority carrier. A second semiconductor layer is formed overlying the texturized substrate topside, made from hydrogenated amorphous silicon (a-Si:H) and doped with the first dopant. An antireflective coating is formed overlying the second semiconductor layer. A third semiconductor layer is formed overlying the first semiconductor substrate backside, made from intrinsic a-Si:H. First and second majority carrier type organic semiconductor layers are formed overlying the third semiconductor layer in patterns. A dielectric organic semiconductor layer is formed overlying the first majority carrier type organic semiconductor layer and the second majority carrier type organic semiconductor layer, filling the spaces in the pattern. A first metal grid is connected to first organic semiconductor contact regions and a second metal grid is connected to the second organic semiconductor contact regions.
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Citations
20 Claims
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1. A method for fabricating a back contact solar cell with organic semiconductor heterojunctions, the method comprising:
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providing a substrate made from a first semiconductor of silicon lightly doped with a first dopant type having a first majority carrier, the substrate having a topside and a backside; texturing the substrate topside; forming a second semiconductor layer overlying the first semiconductor substrate topside, made from hydrogenated amorphous silicon (a-Si;
H) and doped with the first dopant;forming an antireflective coating overlying the second semiconductor layer; forming a third semiconductor layer overlying the first semiconductor substrate backside, made from intrinsic a-Si;
H;forming a first majority carrier type organic semiconductor layer overlying the third semiconductor layer inn a first pattern, where the first pattern includes channels in the first majority carrier type organic semiconductor exposing the underlying third semiconductor layer; forming a second majority carrier type organic semiconductor layer in a second pattern overlying the third semiconductor layer in the first majority carrier type organic semiconductor pattern channels, where the second majority carrier is opposite in polarity to the first majority carrier, and where the second pattern of second majority carrier type organic semiconductor incompletely fills the channels in the first majority carrier type organic semiconductor, forming spaces between the first majority carrier type organic semiconductor layer and the second majority carrier type organic semiconductor layer, exposing the third semiconductor layer; forming a dielectric organic semiconductor layer overlying the first majority carrier type organic semiconductor layer and the second majority carrier type organic semiconductor layer, filling the spaces, with openings exposing the first majority carrier type organic semiconductor layer and the second majority carrier type organic semiconductor layer that respectively form first and second organic semiconductor contact regions; forming a first metal grid connected to first organic semiconductor contact regions; and
,forming a second metal grid connected to second organic semiconductor contact regions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A back contact solar cell with organic semiconductor heterojunctions, the solar cell comprising:
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a substrate made from a first semiconductor of silicon lightly doped with a first dopant type having a first majority carrier, the substrate having a textured topside and a backside; a second semiconductor layer overlying the first semiconductor substrate textured topside, made from hydrogenated amorphous silicon (a-Si;
H) and doped with the first dopant;an antireflective coating overlying the second semiconductor layer; a third semiconductor layer overlying the first semiconductor substrate backside, made from intrinsic a-Si;
H;a first majority carrier type organic semiconductor layer overlying the third semiconductor layer in a first pattern, where the first pattern includes channels in the first majority carrier type organic semiconductor exposing the underlying third semiconductor layer; a second majority carrier type organic semiconductor layer formed in a second pattern overlying the third semiconductor layer in the first majority carrier type organic semiconductor pattern channels, where the second majority carrier is opposite in polarity to the first majority carrier, and where the second pattern of second majority carrier type organic semiconductor incompletely fills the channels in the first majority carrier type organic semiconductor, forming spaces between the first majority carrier type organic semiconductor layer and the second majority carrier type organic semiconductor layer, exposing the third semiconductor layer; a dielectric organic semiconductor layer overlying the first majority carrier type organic semiconductor layer and the second majority carrier type organic semiconductor layer, filling the spaces; openings in the dielectric organic semiconductor layer exposing the first majority carrier type organic semiconductor layer and the second majority carrier type organic semiconductor layer that respectively form first and second organic semiconductor contact regions; a first metal grid connected to first organic semiconductor contact regions; and
, a second metal grid connected to second organic semiconductor contact regions. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A back contact solar cell with organic semiconductor heterojunctions, the solar cell comprising;
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a substrate made from a first semiconductor of silicon lightly doped with a first dopant type having a first majority carrier and a first energy bandgap, the substrate having a textured topside and a backside; a second semiconductor layer overlying the first semiconductor substrate textured topside, made from hydrogenated amorphous silicon (a-Si;
H) and doped with the first dopant;an antireflective coating overlying the second semiconductor layer; a third semiconductor layer overlying the first semiconductor substrate backside, made from intrinsic a-Si;
H having a second energy gap larger than the first energy gap;a first majority carrier type organic semiconductor layer, having a third energy bandgap larger than the second energy bandgap, overlying the third semiconductor layer in a first pattern, where the first pattern includes channels in the first majority carrier type organic semiconductor exposing the underlying third semiconductor layer; a second majority carrier type organic semiconductor layer, having a fourth energy bandgap larger than the second energy gap, formed in a second pattern overlying the third semiconductor layer in the first majority carrier type organic semiconductor pattern channels, where the second majority carrier is opposite in polarity to the first majority carrier, and where the second pattern of second majority carrier type organic semiconductor incompletely fills the channels in the first majority carrier type organic semiconductor, forming spaces between the first majority carrier type organic semiconductor layer and the second majority carrier type organic semiconductor layer, exposing the third semiconductor layer; a dielectric organic semiconductor layer overlying the first majority carrier type organic semiconductor layer and the second majority carrier type organic semiconductor layer, filling the spaces; openings in the dielectric organic semiconductor layer exposing the first majority carrier type organic semiconductor layer and the second majority carrier type organic semiconductor layer that respectively form first and second organic semiconductor contact regions; a first metal grid connected to first organic semiconductor contact regions; and
,a second metal grid connected to second organic semiconductor contact regions.
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Specification