Fabrication of solar cells with electrically conductive polyimide adhesive

Patent metadata

Field	Value
Publication number	US-9691930-B2
Application number	US-201514934262-A
Country	US
Kind code	B2
Filing date	Nov 6, 2015
Priority date	Aug 7, 2013
Publication date	Jun 27, 2017
Grant date	Jun 27, 2017

Abstract

The present disclosure provides a method of manufacturing a solar cell including: providing a first substrate and a second substrate; depositing on the first substrate a sequence of layers of semiconductor material forming a solar cell including a top subcell and a bottom subcell; forming a back metal contact over the bottom subcell; applying a conductive polyimide adhesive to the second substrate; attaching the second substrate on top of the back metal contact; and removing the first substrate to expose the surface of the top subcell.

First claim

The invention claimed is:

1. An inverted metamorphic multijunction solar cell comprising:
a sequence of layers of semiconductor material forming an inverted metamorphic multijunction solar cell including a top subcell and a bottom subcell;
a back metal contact disposed on the bottom subcell; and
an electrically conductive substrate attached to the back metal contact with a cured electrically conductive polyimide adhesive, wherein the electrically conductive substrate comprises a metallic flexible film comprising a molybdenum layer.

2. The solar cell of claim 1 , wherein the electrically conductive polyimide adhesive comprises carbon black particles.

3. The solar cell of claim 2 , wherein the carbon black particles have a size of less than or equal to 5 micrometers.

4. The solar cell of claim 1 , wherein the electrically conductive polyimide adhesive comprises silver flakes.

5. The solar cell of claim 1 , wherein the cured electrically conductive polyimide adhesive has a resistivity from 100 Ω-cm to 3000 Ω-cm.

6. The solar cell of claim 1 , wherein the electrically conductive substrate is a flexible substrate.

7. A solar cell comprising:
a sequence of layers of semiconductor material forming a solar cell including a top subcell and a bottom subcell;
a back metal contact disposed on the bottom subcell; and
an electrically conductive substrate attached to the back metal contact with a cured electrically conductive polyimide adhesive, wherein the electrically conductive substrate comprises a metallic flexible film comprising a molybdenum layer.

8. The solar cell of claim 7 , wherein the electrically conductive polyimide adhesive comprises carbon black particles.

9. The solar cell of claim 8 , wherein the carbon black particles have a size of less than or equal to 5 micrometers.

10. The solar cell of claim 7 , wherein the electrically conductive polyimide adhesive comprises silver flakes.

11. The solar cell of claim 7 , wherein the cured electrically conductive polyimide adhesive has a resistivity from 100 Ω-cm to 3000 Ω-cm.

12. A solar cell comprising:
a sequence of layers of semiconductor material forming a solar cell including a top subcell and a bottom subcell;
a back metal contact disposed on the bottom subcell; and
an electrically conductive substrate attached to the back metal contact with an electrically conductive polyimide adhesive, wherein the back metal contact comprises molybdenum.

13. The solar cell of claim 12 wherein the back metal contact comprises a sequence of metal layers selected from the group consisting of Ti/Au/Mo/Ag/Au, Ti/Au/Mo/Ag, and Ti/Mo/Ag.

14. An inverted metamorphic multijunction solar cell comprising:
a sequence of layers of semiconductor material forming an inverted metamorphic multijunction solar cell including a top subcell and a bottom subcell;
a back metal contact disposed on the bottom subcell, wherein the back metal contact comprises a sequence of metal layers selected from the group consisting of Ti/Au/Mo/Ag/Au, Ti/Au/Mo/Ag, and Ti/Mo/Ag; and
an electrically conductive substrate comprising a metallic flexible film comprising molybdenum attached to the back metal contact with a cured electrically conductive polyimide adhesive comprising silver flakes and/or carbon black particles having a size of less than or equal to 5 micrometers,
wherein the cured electrically conductive polyimide adhesive has a resistivity from 100 Ω-cm to 3000 Ω-cm.

Assignees

• Solaero Tech Corp

Inventors

• Stan Mark A
• Mackos Chelsea
• Steinfeldt Jeff

Classifications

• Y02P70/521

  Cross-Sectional Technologies · mapped topic

• Y02E10/544

  Solar cells from Group III-V materials · CPC title

• H01L31/078

  Electricity · mapped topic

• H01L31/1892

  Electricity · mapped topic

• H01L31/06875 Primary

  Electricity · mapped topic