Graded band gap multi-junction solar energy cell
First Claim
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1. A solar cell comprising:
- a. a substrate layer of a crystalline material (compound) selected from the group consisting of compounds of group III-A-V-A elements (element compounds); and
b. a monocrystalline layer on said substrate(i) composed of material selected from the group consisting of III-A-V-A compounds (element compounds) such that the composition of the monocrystalline layer is continuously changing and of the general form A1-x A'"'"'x B1-y B'"'"'y where A and A'"'"' are group IIIA elements selected from the group consisting of Al, Ga and In, B and B'"'"' are group VA elements selected from the group consisting of P, As and Sb, 0≦
x≦
1 and 0≦
y≦
1 whereby progressively narrower (continuously changing) band gaps are provided;
(ii) suitably doped to produce a plurality of alternately active and inactive junctions; and
(iii) having a p-region on one side and n-region on the other side of each inactive junction, and an active region about each active junction, said active region being bounded by an n-region and a p-region such that(a) in each p-region and in each n-region the flow of carriers is dominated by the region'"'"'s concentration gradient;
(b) (in each and every p-region and in n-region) the net current (density) throughout the cell is the same;
(c) the electric field in each active region is much stronger than the electric fields in the p-region and n-region adjacent to it; and
(d) the width (length) of each (each) region between active junctions substantially equals the diffusion length of the electrons and holes generated in (each) each said region.
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Abstract
The specification discloses a solar cell having a graded band gap and a plurality of alternately active and inactive p-n junctions. The cell has a gradually changing monocrystalline structure of IIIA-VA compounds. The graded band gaps of the cell are the result of the gradually changing chemical composition of the cell'"'"'s monocrystalline structure. The junctions are produced by conventional doping techniques.
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Citations
5 Claims
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1. A solar cell comprising:
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a. a substrate layer of a crystalline material (compound) selected from the group consisting of compounds of group III-A-V-A elements (element compounds); and b. a monocrystalline layer on said substrate (i) composed of material selected from the group consisting of III-A-V-A compounds (element compounds) such that the composition of the monocrystalline layer is continuously changing and of the general form A1-x A'"'"'x B1-y B'"'"'y where A and A'"'"' are group IIIA elements selected from the group consisting of Al, Ga and In, B and B'"'"' are group VA elements selected from the group consisting of P, As and Sb, 0≦
x≦
1 and 0≦
y≦
1 whereby progressively narrower (continuously changing) band gaps are provided;(ii) suitably doped to produce a plurality of alternately active and inactive junctions; and (iii) having a p-region on one side and n-region on the other side of each inactive junction, and an active region about each active junction, said active region being bounded by an n-region and a p-region such that (a) in each p-region and in each n-region the flow of carriers is dominated by the region'"'"'s concentration gradient; (b) (in each and every p-region and in n-region) the net current (density) throughout the cell is the same; (c) the electric field in each active region is much stronger than the electric fields in the p-region and n-region adjacent to it; and (d) the width (length) of each (each) region between active junctions substantially equals the diffusion length of the electrons and holes generated in (each) each said region. - View Dependent Claims (2, 3, 4, 5)
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Specification