Method of forming an electronic article

• US 9,312,416 B2
• Filed: 11/12/2013
• Issued: 04/12/2016
• Est. Priority Date: 11/12/2012
• Status: Active Grant

• Current Assignee: Dow Silicones Corporation (Dow, Inc.)
• Original Assignee: Dow, Inc.
• Inventors: Fisher, Mark, Juen, Don, Ketola, Barry, Shephard, Nick
• Primary Examiner(s): NIKMANESH, SEAHVOSH J
• Application Number:
  US14/440,754
• Publication Number:
  US 20150263208A1
• Time in Patent Office: 882 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: B32B 2037/1253 curable adhesive
• CPC Class Codes: B32B 2307/20 having particular electrical or magnetic properties, e.g. piezoelectric
• CPC Class Codes: B32B 2307/40 having particular optical properties light or UV resistant B32B2307/71
• CPC Class Codes: B32B 2457/12 Photovoltaic modules
• CPC Class Codes: B32B 37/1009 using vacuum and fluid pressure
• CPC Class Codes: B32B 37/1292 selectively, e.g. in stripes, in patterns B32B37/0076 takes precedence
• CPC Class Codes: B32B 37/18 involving the assembly of discrete sheets or panels only
• CPC Class Codes: C08G 77/12 containing silicon bound to hydrogen C08G77/045 takes precedence
• CPC Class Codes: C08G 77/20 containing silicon bound to unsaturated aliphatic groups C08G77/045 takes precedence
• CPC Class Codes: C08L 83/04 Polysiloxanes
• CPC Class Codes: H01L 31/048 Encapsulation of modules
• CPC Class Codes: H01L 31/0481 characterised by the composition of the encapsulation material
• CPC Class Codes: H01L 31/18 Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
• CPC Class Codes: Y02E 10/50 Photovoltaic [PV] energy

Abstract

An electronic article has a perimeter and includes a superstrate, an optoelectronic element disposed on the superstrate, and a silicone encapsulant that is formed from a curable silicone composition and that is disposed on the optoelectronic element sandwiching the optoelectronic element between the superstrate and the silicone encapsulant. The electronic article is formed using a method that includes the step of depositing the curable silicone composition on the optoelectronic element in a pattern defining at least one passage extending from an interior of the electronic article to a perimeter of the electronic article. The method also includes laminating the superstrate, the optoelectronic element, and the curable silicone composition. The curable silicone composition has a complex viscosity of from 10,000 to 50,000,000 cPs at 25° C. as measured at 1 radian per second at 1 to 5% strain. During lamination, the curable silicone composition cures to form the silicone encapsulant and air escapes from through the at least one passage.

Claims

1. A method of forming an electronic article having a perimeter and comprising a superstrate, an optoelectronic element disposed on the superstrate, and a silicone encapsulant that is formed from a curable silicone composition and that is disposed as a layer on the optoelectronic element sandwiching the optoelectronic element between the superstrate and the layer of the silicone encapsulant, said method comprising the steps of:

depositing the curable silicone composition on the optoelectronic element in a pattern defining at least one passage extending from an interior of the electronic article to a perimeter of the electronic article; and

laminating the superstrate, the optoelectronic element, and the curable silicone composition to form the electronic article,

wherein the curable silicone composition has an complex viscosity of from 10,000 to 50,000,000 cPs at 25°

C. as measured at 1 radian per second at 1 to 5% strain, and

wherein during the step of laminating the curable silicone composition cures to form the silicone encapsulant and air escapes from the interior of the electronic article to the perimeter of the electronic article through the at least one passage to form a layer of the curable silicone composition and the curable silicone composition cures to form the layer of the silicone encapsulant.

2. A method as set forth in claim 1 wherein 0 to 4 air bubbles are present per square meter of the silicone encapsulant wherein the air bubbles have a diameter of less than 1 mm.

3. A method as set forth in claim 1 wherein the electronic article further comprises a silicone tie layer disposed on the superstrate and sandwiched between the optoelectronic element and the superstrate, wherein the silicone tie layer is formed from a second curable silicone composition, and wherein the step of laminating is further defined as laminating the superstrate, the optoelectronic element, the curable silicone composition, and the second curable silicone composition to form the silicone tie layer and to form the electronic article further comprising the silicone tie layer.

4. A method as set forth in claim 1 wherein the electronic article further comprises a backsheet disposed on the silicone encapsulant and sandwiching the silicone encapsulant between the optoelectronic element and the backsheet.

5. A method as set forth in claim 1 wherein the method further comprises the step of applying a vacuum to evacuate the air from the interior of the electronic article to the perimeter of the electronic article through the at least one passage to form the layer of the curable silicone composition.

6. A method as set forth in claim 1 wherein the method further comprises the step of applying heat to heat the curable silicone composition during the step of laminating.

7. A method as set forth in claim 1 wherein the step of laminating is further defined as simultaneously applying a vacuum and a compression force to evacuate the air from the interior of the electronic article to the perimeter of the electronic article through the at least one passage to form a compressed layer of the curable silicone layer and subsequently applying heat to heat the curable silicone composition.

8. A method as set forth in claim 1 wherein the pattern is further defined as comprising two or more rows of the curable silicone composition each disposed on the optoelectronic element approximately parallel to one another.

9. A method as set forth in claim 1 wherein the pattern is further defined as comprising two or more rows of the curable silicone composition each disposed on the optoelectronic element transverse to one another.

10. A method of forming a photovoltaic cell module having a perimeter and comprising a superstrate having a light transmittance of at least 70 percent as determined by UV/Vis spectrophotometry using ASTM E424-71 (2007) (ASTM International, formerly American Society for Testing and Materials), a photovoltaic cell disposed on the superstrate, and a silicone encapsulant disposed as a layer on the photovoltaic cell and sandwiching the photovoltaic cell between the superstrate and the layer of the silicone encapsulant, said method comprising the steps of:

depositing the curable silicone composition on the photovoltaic cell in a pattern defining at least one passage extending from an interior of the photovoltaic cell module to a perimeter of the photovoltaic cell module; and

laminating the superstrate, the photovoltaic cell, and the curable silicone composition to form the photovoltaic cell module,

wherein the curable silicone composition has an complex viscosity of from 80,000 to 200,000 cPs at 25°

C. as measured at 1 radian per second at 1 to 5% strain, and

wherein during the step of laminating the curable silicone composition cures to form the silicone encapsulant and air escapes from the interior of the photovoltaic cell module to the perimeter of the photovoltaic cell module through the at least one passage to form a layer of the curable silicone composition and the curable silicone composition cures to form the layer of the silicone encapsulant.

11. A method as set forth in claim 10 wherein less than 5 air bubbles are present per square meter of the silicone encapsulant wherein the air bubbles have a diameter of less than 1 mm.

12. A method as set forth in claim 10 wherein the photovoltaic cell module further comprises a silicone tie layer disposed on the superstrate and sandwiched between the optoelectronic element and the superstrate, wherein the silicone tie layer is formed from a second curable silicone composition, and wherein the step of laminating is further defined as laminating the superstrate, the optoelectronic element, the curable silicone composition, and the second curable silicone composition to form the silicone tie layer and to form the photovoltaic cell module further comprising the silicone tie layer.

13. A method as set forth in claim 10 wherein the photovoltaic cell module further comprises a backsheet disposed on the silicone encapsulant and sandwiching the silicone encapsulant between the optoelectronic element and the backsheet.

14. A method as set forth in claim 10 wherein the method further comprises the step of applying a vacuum to evacuate the air from the interior of the photovoltaic cell module to the perimeter of the photovoltaic cell module through the at least one passage to form the layer of the curable silicone composition.

15. A method as set forth in claim 10 wherein the method further comprises the step of applying heat to heat the curable silicone composition during the step of laminating.

16. A method as set forth in claim 10 wherein the pattern is further defined as comprising two or more rows of the curable silicone composition each disposed on the optoelectronic element approximately parallel to one another.

17. A method as set forth in claim 10 wherein the pattern is further defined as comprising two or more rows of the curable silicone composition each disposed on the optoelectronic element transverse to one another.