Barrier layer made of a curable resin containing polymeric polyol

1. A component comprising a substrate, a layered structure arranged on the substrate, and a barrier layer arranged over the layered structure for protection against moisture, wherein the layered structure includes an optically active film and wherein the barrier layer comprises the reaction product of polymeric polyol in the form of polyvinyl butyral, and a curable epoxy resin, wherein the amount of polymeric polyol is in the range of from 1% to 30% by weight of the curable epoxy resin.

2. The component of claim 1 , wherein the barrier layer is located at least at one outer surface of the component.

3. The component of claim 2 , wherein the layered structure comprises an edge at its outer surface and wherein the barrier layer covers the edge.

4. The component of claim 1 , wherein the barrier layer is impermeable to moisture.

5. The component of claim 4 , wherein the layered structure comprises an edge at its outer surface and wherein the barrier layer covers the edge.

6. The component of claim 1 , wherein the component further comprises a laminate structure with a cover and an intermediate adhesive layer that is arranged over the barrier layer.

7. The component of claim 6 , wherein the cover comprises at least one plastic layer.

8. The component of claim 6 , wherein the cover is a glass plate.

9. The component of claim 6 , wherein the intermediate adhesive layer consists of polyvinyl butyral.

10. The component of claim 1 , wherein the curable epoxy resin is UV curable.

11. The component of claim 1 , wherein the barrier layer covers the layered structure on a top surface facing away from the substrate and on a side, and ends on the substrate.

12. The component of claim 1 , which component is a solar cell or a solar module.

13. The component of claim 1 , wherein the layered structure comprises a moisture-sensitive absorber layer.

14. The component of claim 13 , wherein the moisture-sensitive absorber layer comprises copper-indium-diselenide.

15. A solar cell comprising a substrate, a layered structure arranged on the substrate, and a barrier layer arranged over the layered structure for protection against moisture, wherein the barrier layer comprises the reaction product of a polymeric polyol and an epoxy resin, and wherein the amount of polymeric polyol is in the range of from 1% to 30% by weight of the epoxy resin.

16. The solar cell of claim 15 , wherein the wherein the layered structure includes an optically active film.

17. The solar cell of claim 16 , wherein the optically active film comprises a moisture-sensitive absorber layer.

18. The solar cell of claim 17 , wherein the moisture-sensitive absorber layer comprises copper-indium-diselenide.

19. The solar cell of claim 15 , wherein the polymeric polyol comprises polyvinyl butyral.

20. The solar cell of claim 15 , further comprising a cover and an intermediate adhesive layer that is arranged over the barrier layer.

21. A solar module comprising a substrate, a layered structure arranged on the substrate, and a barrier layer arranged over the layered structure for protection against moisture, wherein the barrier layer comprises the reaction product of a polymeric polyol and an epoxy resin, and wherein the amount of polymeric polyol is in the range of from 1% to 30% by weight of the epoxy resin.