Bifacial elongated solar cell devices
View Patent ↗A solar cell assembly comprising a plurality of elongated solar cells is provided. Each solar cell in the plurality of cells comprises a conductive core configured as a first electrode, a semiconductor junction circumferentially disposed on the conductive core, and a TCO layer disposed on the semiconductor junction. The plurality of solar cells is arranged in a parallel manner in pairs on a transparent insulating substrate such that (i) the solar cells in each respective pair are joined together lengthwise by a corresponding counter-electrode, and (ii) solar cells adjacent pairs of solar cells do not touch each other. Each solar cell pair is affixed to the transparent insulating substrate. A first and second solar cell pair is electrically connected in series by an electrical contact that electrically connects the first electrode of each cell in the first pair to the corresponding counter-electrode of the second pair.
1. A solar cell assembly comprising:
(A) a plurality of elongated solar cells, each elongated solar cell in said plurality of elongated solar cells comprising:
an elongated conductive core configured as a first electrode;
a semiconductor junction circumferentially disposed on said elongated conductive core; and
a transparent conductive oxide layer disposed on said semiconductor junction;
wherein elongated solar cells in said plurality of elongated solar cells are arranged in a parallel or a near parallel manner thereby forming a planar array having a first face and a second face, wherein the plurality of elongated solar cells are arranged such that one or more elongated solar cells in said plurality of elongated solar cells do not contact adjacent elongated solar cells;
(B) a plurality of metal counter-electrodes, wherein each respective elongated solar cell in said plurality of elongated solar cells is bound to a first corresponding metal counter-electrode in said plurality of metal counter-electrodes such that the first metal counter-electrode lies in a first groove that is formed in the surface of and runs lengthwise on the respective elongated solar cell; and
(C) a transparent electrically insulating substrate that covers all or a portion of said first face of said planar array; wherein
a first and second elongated solar cell in said plurality of elongated solar cells are electrically connected in series by an electrical contact that connects the first electrode of the first elongated solar cell to the first corresponding counter-electrode of the second elongated solar cell; and
said solar cell assembly is configured to receive direct light from a side of said solar cell assembly that includes said first face of said planar array and a side of said solar cell assembly that includes said second face of said planar array.
2. The solar cell assembly of claim 1 , wherein each respective elongated solar cell in said plurality of elongated solar cells is bound to a second corresponding metal counter-electrode in said plurality of metal counter-electrodes such that the second metal counter-electrode lies in a second groove that runs lengthwise on the respective elongated solar cell and wherein said first groove and said second groove are on opposite or substantially opposite sides of said respective elongated solar cell.
3. The solar cell assembly of claim 2 , wherein said electrical contact connects the first electrode of the first elongated solar cell to the first corresponding and the second corresponding counter-electrode of the second elongated solar cell.
4. The solar cell assembly of claim 1 , further comprising:
(D) a transparent insulating covering disposed on said second face of said planar array, thereby encasing said plurality of elongated solar cells between said transparent insulating covering and said transparent electrically insulating substrate.
5. The solar cell assembly of claim 4 , wherein said transparent insulating covering and said transparent insulating substrate are bonded together by a sealant.
6. The solar cell assembly of claim 5 , wherein said sealant is ethylene vinyl acetate.
7. The solar cell assembly of claim 1 , wherein said semiconductor junction is a homojunction, a heterojunction, a heteroface junction, a buried homojunction, or a p-i-n junction.
8. The solar cell assembly of claim 1 , wherein there is an intrinsic layer disposed between said semiconductor junction and said transparent conductive oxide in an elongated solar cell in said plurality of elongated solar cells.
9. The solar cell assembly of claim 8 , wherein the intrinsic layer is formed by an undoped transparent oxide.
10. The solar cell assembly of claim 8 , wherein the intrinsic layer is made of zinc oxide, indium-tin-oxide, or a combination thereof.
11. The solar cell assembly of claim 1 , wherein the semiconductor junction comprises:
an inner coaxial layer; and
an outer coaxial layer,
wherein said outer coaxial layer comprises a first conductivity type and said inner coaxial layer comprises a second, opposite, conductivity type.
12. The solar cell assembly of claim 11 , wherein said inner coaxial layer comprises copper-indium-gallium-diselenide (CIGS).
13. The solar cell assembly of claim 11 , wherein said outer coaxial layer comprises CdS, SnO 2 , ZnO, ZrO 2 , or doped ZnO.
14. The solar cell assembly of claim 1 , wherein said elongated conductive core is made of aluminum, molybdenum, steel, nickel, silver, gold, an alloy thereof, or any combination thereof.
15. The solar cell assembly of claim 1 , wherein said transparent conductive oxide layer is made of tin oxide SnO x , with or without fluorine doping, indium-tin oxide (ITO), zinc oxide (ZnO) or a combination thereof.
16. The solar cell assembly of claim 1 , wherein said transparent insulating substrate comprises glass or Tedlar.
17. The solar cell assembly of claim 1 , wherein there is ethylene vinyl acetate between said plurality of elongated solar cells and said transparent electrically insulating substrate.
18. The solar cell assembly of claim 1 , wherein said elongated conductive core is hollowed.
19. The solar cell assembly of claim 1 , wherein an elongated solar cell in said plurality of elongated solar cells is rod-shaped.
20. The solar cell assembly of claim 1 , wherein said elongated conductive core is metal tubing.
21. The solar cell assembly of claim 1 , wherein two or more elongated solar cells in said plurality of elongated solar cells are electrically connected in parallel.
22. The solar cell assembly of claim 1 , wherein an elongated solar cell in said plurality of elongated solar cells further comprises an antireflective coating that is circumferentially disposed on said transparent conductive oxide layer.
23. The solar cell assembly of claim 22 , wherein said antireflective coating is made of MgF 2 .
24. The solar cell assembly of claim 1 , wherein said elongated conductive core comprises:
an inner core made of a nonmetallic material; and
a conductive outer core circumferentially disposed on said inner core.
25. The solar cell assembly of claim 24 , wherein said inner core is tubing.
26. The solar cell assembly of claim 24 , wherein said inner core is made of polybenzamidazole, polymide, polytetrafluoroethylene, polyetheretherketone, polyamide-imide, glass-based phenolic, polystyrene, cross-linked polystyrene, polyester, polycarbonate, polyethylene, polyethylene, acrylonitrile-butadiene-styrene, polytetrafluoro-ethylene, polymethacrylate, nylon 6,6, cellulose acetate butyrate, cellulose acetate, rigid vinyl, plasticized vinyl, or polypropylene.
27. A plurality of solar cell assemblies, each solar cell assembly in the plurality of solar cells assemblies having the structure of the solar cell assembly of claim 1 , wherein solar cell assemblies in said plurality of solar assemblies are arranged in rows on a surface having an albedo that exceeds 10%.
28. A plurality of solar cell assemblies, each solar cell assembly in the plurality of solar cells assemblies having the structure of the solar cell assembly of claim 1 , wherein solar cell assemblies in said plurality of solar assemblies are arranged in rows on a surface having an albedo that exceeds 20%.
29. A plurality of solar cell assemblies, each solar cell assembly in the plurality of solar cells assemblies having the structure of the solar cell assembly of claim 1 , wherein solar cell assemblies in said plurality of solar assemblies are arranged in rows on a surface having an albedo that exceeds 40%.
30. A plurality of solar cell assemblies, each solar cell assembly in the plurality of solar cells assemblies having the structure of the solar cell assembly of claim 1 , wherein solar cell assemblies in said plurality of solar assemblies are arranged in rows on a surface that is painted white.
31. A plurality of solar cell assemblies, each solar cell assembly in the plurality of solar cells assemblies having the structure of the solar cell assembly of claim 1 , wherein
solar cell assemblies in said plurality of solar assemblies are arranged in rows; the first face of each planar array in each solar cell assembly in said plurality of solar cell assemblies is directed South; and
solar cell assemblies in said plurality of solar assemblies have an angle of inclination with respect to the horizontal that is between five degrees and forty-five degrees.
32. The plurality of solar cell assemblies of claim 31 , wherein solar cell assemblies in said plurality of solar assemblies have an angle of inclination with respect to the horizontal that is between fifteen degrees and forty degrees.
33. The plurality of solar cell assemblies of claim 31 , wherein solar cell assemblies in said plurality of solar assemblies have an angle of inclination with respect to the horizontal that is between twenty-five degrees and thirty-five degrees.
34. The plurality of solar cell assemblies of claim 31 , wherein solar cell assemblies in said plurality of solar assemblies have an angle of inclination with respect to the horizontal that is about 30 degrees.