Solar cell assembly and also solar cell arrangement

Patent metadata

Field	Value
Publication number	US-9640688-B2
Application number	US-201013386292-A
Country	US
Kind code	B2
Filing date	Jul 19, 2010
Priority date	Jul 20, 2009
Publication date	May 2, 2017
Grant date	May 2, 2017

Abstract

A light-absorbing or light-emitting solar cell assembly comprises an electrical insulator disposed on an electrically conductive substrate and that is provided with a metallized surface and at least one solar cell connected to the electrically conductive substrate, wherein the solar cell includes refractive secondary optics and is disposed in a recess in the insulator. The solar cell is connected to the substrate by the side orientated towards the substrate via an electrically conductive connection and the recess is dimensioned such that an interspace is produced laterally between the solar cell and the electrical insulator, the interspace being filled with a coupling medium and the solar cell being connected to the metallized surface by at least one electrical contact.

First claim

The invention claimed is:

1. A solar cell assembly comprising:
an electrical insulator that is disposed on an electrically conductive substrate and is provided with a metallised surface, and
at least one solar cell with refractive secondary optics to focus sunlight on the solar cell, the refractive secondary optics comprising a refractor that is configured solidly from an optically transparent dielectric material with an average transmissibility of at least 90% in the wavelength range between 400 and 2,500 nm, measured with a layer thickness of 1 mm, the refractor including an entrance aperture configured to be orientated towards sunlight and an outlet aperture configured to be orientated towards the solar cell, the entrance aperture or the outlet aperture, or both, being configured such that a refractive concentration of incident sunlight is effected,
wherein the at least one solar cell is connected to the electrically conductive substrate,
wherein the solar cell is disposed in a recess in the electrical insulator that is provided with the metallised surface, the solar cell being connected to the electrically conductive substrate by a side orientated towards the electrically conductive substrate via an electrically conductive connection and the recess being dimensioned such that an interspace is produced laterally between the solar cell and the electrical insulator that is provided with the metallised surface, wherein the solar cell, at least on a side connected to the refractive secondary optics, has at least one protective coating made of an optically transparent metal, aluminium oxide, silicon, silicon oxide, silicon nitride, silicon carbide, one or more polycarbonates, one or more poly(meth)acrylates, silicone, glass, quartz glass, or one or more thermoplastic plastics,
the interspace being filled with a coupling medium and the solar cell being connected to the metallised surface by at least one electrical contact, wherein the coupling medium encapsulates the solar cell and the at least one electrical contact.

2. The solar cell assembly according to claim 1 , wherein the coupling medium is selected from the group consisting of one or more transparent materials, silicones, silicone oil, polycarbonates, poly acrylates, poly(meth)acrylates, glass, quartz glass, thermoplastic plastics, or a combination thereof.

3. The solar cell assembly according to claim 1 , wherein the electrically conductive connection of the solar cell to the electrically conductive substrate includes one or more of an adhesive, solder, a bond connection, or welding.

4. The solar cell assembly according to claim 1 , wherein the metallised surface consists of one or more metals selected from the group consisting of copper, silver, nickel, gold, platinum, titanium, palladium, aluminium, germanium, or one or more alloys or one or more combinations of these.

5. The solar cell assembly according to claim 1 , wherein the electrically conductive substrate consists of one or more of copper, aluminium, titanium, steel, silicon alloys, or metal alloys.

6. The solar cell assembly according to claim 1 , wherein the electrical insulator consists of one or more epoxy resins, thermoplastic plastics, ceramics, aluminium oxide, polyethylenes, polyvinylchlorides, polytetrafluoroethylenes, silicones, or glass.

7. The solar cell assembly according to claim 1 , wherein the optically transparent dielectric material for the refractive secondary optics is selected from the group consisting of epoxy resin, silicone, silicone resin, polycarbonate, one or more polyacrylates, one or more poly(meth)acrylates, glass, quartz glass, one or more thermoplastic plastics, silicon oxide, silicon carbide, aluminium oxide, or one or more combinations of thereof.

8. The solar cell assembly according to claim 1 , wherein the entrance aperture or outlet aperture, or both, of the refractive secondary optics has one or more of a flat, convex, or concave surface contour.

9. The solar cell assembly according to claim 1 , wherein an area of the entrance aperture of the refractive secondary optics is greater than an area of the outlet aperture of the refractive secondary optics.

10. The solar cell assembly according to claim 1 , wherein the refractive secondary optics includes a projection that surrounds the refractor.

11. The solar cell assembly according to claim 10 , wherein the refractor, with the exception of regions of the entrance aperture and outlet aperture or a side of the projection orientated towards the outlet aperture, is coated with a highly reflective coating with a reflection degree ρ>70% in a wavelength range of 400 to 800 nm or a reflection degree ρ>80% in a wavelength range of 900 to 2,500 nm.

12. The solar cell assembly according to claim 11 , wherein the highly reflective coating of the refractive secondary optics comprises aluminium or a layer sequence of materials with different refractive indices n 20 D or alloys of these.

13. The solar cell assembly according to claim 11 , wherein the highly reflective coating of the refractive secondary optics has a layer thickness of 1 nm to 3 mm.

14. The solar cell assembly according to claim 1 , wherein the refractor is fixed on the metallised surface by a bond by at least one of gluing or mechanical fixing.

15. The solar cell assembly according to claim 14 , wherein a material for formation of the bond is selected from the group consisting of one or more thermoplastic plastics, epoxy resins, silicones, acrylates, cyanoacrylates, polycarbonates, polyacrylates, poly(meth)acrylates, or one or more combinations thereof.

16. The solar cell assembly according to claim 14 , wherein a material for formation of the bond is a thermally conducting material that is electrically insulating.

17. The solar cell assembly according to claim 15 , wherein a material for the bond and the coupling medium are the same.

18. The solar cell assembly according to claim 14 , wherein the material for formation of the bond, in a projection direction, is covered completely by the projection of the secondary optics.

19. The solar cell assembly according to claim 1 , wherein the refractive secondary optics is enclosed by a casing in a form fit, an upper side of the casing forming the entrance aperture and a lower side of the casing forming the outlet aperture.

20. The solar cell assembly according to claim 19 , wherein the entrance aperture is convexly configured and protrudes beyond the casing in a longitudinal direction.

21. The solar cell assembly according to claim 1 , wherein the refractive secondary optics is connected to one or more of the solar cell or the electrically conductive substrate via at least one fastening element.

22. The solar cell assembly according to claim 1 , wherein one or more of at least one protective diode or at least one primary optics for concentration of light onto the refractive secondary optics is included in the solar cell assembly.

23. The solar cell assembly according to claim 1 , wherein the solar cell is connected electrically in series or in parallel to at least one further solar cell via the at least one electrical contact.

24. A solar cell arrangement comprising from 2 to 10,000 solar cell assemblies, each solar cell assembly comprising:
an electrical insulator that is disposed on an electrically conductive substrate and is provided with a metallised surface, and
at least one solar cell with a refractive secondary optics to focus sunlight on the sol

Assignees

• Bösch Armin
• Jaus Joachim
• Bett Andreas
• Peharz Gerhard
• Nitz Peter
• Schmidt Thomas
• Fraunhofer Ges Forschung

Inventors

• Bösch Armin
• Jaus Joachim
• Bett Andreas
• Peharz Gerhard
• Nitz Peter
• Schmidt Thomas

Classifications

• H10W72/884

  Die-attach connectors and bond wires · CPC title

• Y02E10/52

  PV systems with concentrators · CPC title

• H10F77/484

  Refractive light-concentrating means, e.g. lenses · CPC title

• H10F19/80 Primary

  Encapsulations or containers for integrated devices, or assemblies of multiple devices, having photovoltaic cells · CPC title

• H10F77/70

  Surface textures, e.g. pyramid structures · CPC title