Solar cell module package and method for its preparation

• US 5,470,396 A
• Filed: 04/12/1994
• Issued: 11/28/1995
• Est. Priority Date: 04/12/1994
• Status: Expired due to Fees

• Current Assignee: Amoco/Enron Solar Co.
• Original Assignee: Amoco Corporation (BP PLC)
• Inventors: Twesme, Edward N., Weiss, Peggy A., Mongon, John M.
• Primary Examiner(s): Weisstuch, Aaron
• Application Number:
  US08/226,673
• Time in Patent Office: 595 Days
• Field of Search: 136/251, 136/259, 257/433-434, 437/207, 437/209, 437/211
• US Class Current: 136/251
• CPC Class Codes: H01L 31/046 PV modules composed of a plurality of thin film solar cells deposited on the same substrate
• CPC Class Codes: H01L 31/048 Encapsulation of modules
• CPC Class Codes: H01L 31/075 the potential barriers being only of the PIN type, e.g. amorphous silicon PIN solar cells
• CPC Class Codes: H02S 30/10 Frame structures
• CPC Class Codes: Y02E 10/548 Amorphous silicon PV cells

Abstract

A solar cell module package having improved resistance to mechanical breakage and environmental stress has a layer of asphaltic material interposed between a support member and one or a plurality of solar cells affixed to a first support member. Resistance to environmental stress is further increased by including a barrier coating between the one or plurality of solar cells and the layer of asphaltic material. A method is provided for the preparation of the solar cell module package which includes interposing a layer of asphaltic material between a support member and one or a plurality of solar cells and curing the layer assembled with the module.

Claims

1. A solar cell module package comprising:

a light-transmissive glass support member;

at least one amorphous silicon solar cell comprising a member selected from the group consisting of amorphous silicon and amorphous silicon alloy, secured to said glass support member, said amorphous silicon solar cell comprising a p-type doped layer, an n-type doped layer, an intrinsic layer disposed between said p-type doped layer and said n-type doped layer, a tin oxide conductive layer positioned between said glass support member and said p-type doped layer, and a back contact layer positioned away from said n-type doped layer;

a protective composite layer positioned adjacent said back contact layer of said amorphous silicon solar cell, said protective composite layer comprising a polymeric material and asphalt, said polymeric material being selected from the group consisting of polymeric mesh, a polymeric web, and a polymeric sheet; and

a metal support member positioned adjacent said protective composite layer; and

said protective composite layer being disposed between said amorphous silicon solar cell and said metal support member.

2. The solar cell module package of claim 1, wherein said protective composite layer includes an adherent surface positioned against said solar cell.

3. The solar cell module package of claim 1, wherein said protective composite layer comprises a polymeric web and said asphalt is bonded to and supported by said web.

4. The solar cell module package of claim 1 wherein said protective composite layer comprises a polymeric mesh with interstices and said asphalt is positioned in said interstices and secured to said polymeric mesh.

5. The solar cell module package of claim 1 including a barrier coating for said amorphous silicon solar cell positioned adjacent said protective composite layer.

6. The solar cell module package of claim 1 including metal frame members for substantially retaining and securing said amorphous silicon solar cell and said protective composite layer, said frame means being secured to one of said support members.

7. A solar cell module package comprising:

a glass support member;

a solar cell positioned adjacent said glass support member;

a composite-polymeric layer adjacent the surface of said solar cell opposite the glass support member comprising a polymeric material and asphalt, said polymeric material being selected from the group consisting of polymeric mesh, a polymeric web, and a foraminous polymeric sheet;

a metal support member positioned in proximity to said composite polymeric layer and at least partially coextensive therewith; and

frame members for substantially retaining and supporting said solar cell, said composite polymeric layer and at least one of said support members.

8. A method for preparing a solar cell module package having at least one solar cell positioned between a glass support member and a metal support member, comprising:

interposing a composite polymeric layer of polymeric material and asphalt between said solar cell and said metal support member, said composite polymeric layer being positioned in proximity to said solar cell and said metal support member, said composite polymeric layer being positioned in proximity to said solar cell and adjacent said metal support member to form said package; and

curing said package by heating said composite polymeric layer to a temperature above about 60°

C. and below about 150°

C. for a time sufficient to at least soften said composite layer and provide a seal for said solar cell against environmental elements.

9. The method of claim 8, wherein the package is cured by heating said package to said temperature for approximately 15 minutes.

10. The method of claim 8, further comprising placing a barrier coating on a surface of said solar cell prior to said interposing step, and interposing said composite polymeric layer between the barrier coating and said metal support member prior to said curing step.

11. The method of claim 8, wherein said interposing comprises laying a web of polymeric material supporting asphalt upon a back contact on said solar cell.

12. The method of claim 8 including coating a polymeric mesh with asphalt to form said composite polymeric layer.

13. The method of claim 8 wherein said solar cell comprises an amorphous silicon solar cell comprising a member selected from the group consisting of amorphous silicon and amorphous silicon alloy, and said amorphous silicon solar cell is formed by a procedure comprising a step selected from the group consisting of glow discharge, sputtering, and chemical vapor deposition.