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US 4,536,608 AGranted
Solar cell with two-dimensional hexagonal reflecting diffraction grating
AssigneeExxon Research & Engineering Co.
InventorsPing Sheng, Aaron N. Bloch
Life of this patent
Estimating the term…
Abstract
A solar cell which includes a thin layer of active material bounded on the side toward the incident light with an antireflection coating and bounded on the other side by a two-dimensional hexagonal reflecting diffraction grating to internally reflect the incident light back into the active material.
Claims7
A solar cell comprising:
- (a) an active layer of semiconductor material having a pair of opposed surfaces,
- (b) a two dimensional diffraction grating fixed to one of said surfaces of said active layer and coated with a layer of reflecting material at the interface between said grating and said active material, said grating being a hexagonal array of a plurality of protrusions or depressions wherein said protrusions or depressions are of cylindrical shape such that the distance between the circular cross-sectional centers of said cylindrical shapes is the same between any two adjacent cylindrical shapes.
A solar cell comprising:
- (a) an active layer of semiconductor material having a pair of opposed surfaces,
- (b) a two-dimensional diffraction grating fixed to one of said surfaces of said active layer and coated with a layer of reflecting material at the interface between said grating and said active material, said grating being a hexagonal array of a plurality of protrusions or depressions wherein the spacing between any two adjacent protrusions or depressions is the same.
A solar cell comprising:
- (a) an active layer of semiconductor material having a pair of opposed surfaces,
- (b) a two-dimensional diffraction grating fixed to one of said surfaces of said active layer and coated with a layer of reflecting material at the interface between said grating and said active material, said grating being a hexagonal array of a plurality of protrusions or depressions wherein the angle of intersection between any two cross-sections of the grating taken through the cross-sectional centers of any one of said protrusions or said depressions and any two of its adjacent protrusions of depressions is 60.degree. or a multiple thereof.
Dependencies are inferred from the claim text.