Solar cell module and method of encapsulating same
View Patent ↗A composite solar collection module includes a thin film solar collection cell that is encapsulated between a transparent substrate, such as glass, on one side, and an electrically insulating film on the other. A metallic layer is disposed over the electrically insulating film to provide protection against diffusion of atmospheric species that may harm the thin film solar collection cell. The insulating and metallic layers are dimensioned so that a larger collection cell can be used to collect solar energy over a larger proportion of the available substrate surface area, without causing arcing between the cell edge and the metallic layer edge.
1. A composite solar collection module comprising:
a substrate that is transparent to solar rays, said substrate having a substrate perimeter edge;
a thin film solar cell disposed adjacent said substrate for the collection of solar rays transmitted through said substrate, said thin film solar cell having a cell perimeter edge;
an electrically insulating film applied directly on top of said thin film solar cell opposite said substrate and having an insulating perimeter edge; and
a metallic layer deposited directly onto said insulating film opposite said thin film solar cell and having a metallic perimeter edge;
said metallic perimeter edge being recessed inward from both said substrate perimeter edge and said insulating perimeter edge, said metallic perimeter edge also being at least coextensive with said cell perimeter edge.
2. A solar collection module according to claim 1 , said metallic perimeter edge being coextensive with said cell perimeter edge.
3. A solar collection module according to claim 1 , said insulating perimeter edge being coextensive with said substrate perimeter edge.
4. A solar collection module according to claim 1 , said metallic layer extending 0 to 4 mm beyond said cell perimeter edge toward said substrate perimeter edge.
5. A solar collection module according to claim 4 , said insulating perimeter edge being coextensive with said substrate perimeter edge.
6. A solar collection module according to claim 4 , said metallic perimeter edge being recessed 5 to 15 mm inward from said substrate perimeter edge.
7. A solar collection module according to claim 5 , said metallic perimeter edge being recessed 5 to 15 mm inward from said substrate perimeter edge.
8. A solar collection module according to claim 1 , further comprising a mechanical protection layer disposed over said metallic layer opposite said insulating film, said mechanical protection layer being coextensive with said substrate.
9. A solar collection module according to claim 8 , said substrate being made from glass, said mechanical protection layer being made from a material selected from the group consisting of glass and polymeric materials.
10. A solar collection module according to claim 1 , said solar cell having a PIN structure.
11. A solar collection module according to claim 1 , said solar cell having a NIP structure.
12. A solar collection module according to claim 1 , said solar cell comprising a boron-doped ZnO transparent conductive layer.
13. A solar collection module according to claim 1 , said electrically insulating film being made from PMMA.
14. A solar collection module according to claim 1 , said metallic layer having a thickness of 2 nm to 2 μm.
15. A solar collection module according to claim 14 , said metallic layer having a thickness of about 100 nm.
16. A solar collection module according to claim 15 , said metallic layer being an aluminum film.
17. A solar collection module according to claim 1 , said substrate having dimensions of 1100 mm×1300 mm thereby defining a substrate perimeter edge that is 4800 mm long, said metallic perimeter edge being recessed 5 to 15 mm inward from said substrate perimeter edge, and said cell perimeter edge being recessed 5 to 19 mm inward from said substrate perimeter edge.
18. A solar collection module according to claim 17 , said electrically insulating film having a thickness of 1 μm to 10 μm, said metallic layer having a thickness of 2 nm to 2 μm.
19. A solar collection module according claim 1 , said thin film solar cell being in direct contact with said substrate.
20. A solar collection module according to claim 1 , wherein said electrically insulating film is applied only on one side of said thin film solar cell.
21. A solar collection module according to claim 1 , said electrically insulating film having a thickness of 1 μm to 10 μm.