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Solar cell contact formation using laser ablation

United States Patent

8,785,236
July 22, 2014
View the Complete Patent at the US Patent & Trademark Office
The formation of solar cell contacts using a laser is described. A method of fabricating a back-contact solar cell includes forming a poly-crystalline material layer above a single-crystalline substrate. The method also includes forming a dielectric material stack above the poly-crystalline material layer. The method also includes forming, by laser ablation, a plurality of contacts holes in the dielectric material stack, each of the contact holes exposing a portion of the poly-crystalline materiat layer; and forming conductive contacts in the plurality of contact holes.
Harley; Gabriel (Mountain View, CA), Smith; David D. (Campbell, CA), Cousins; Peter John (Menlo Park, CA)
SunPower Corporation (San Jose, CA)
13/ 669,147
20140134787
November 5, 2012
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT The invention described herein was made with Governmental support under contract number DE-FC36-07GO17043 awarded by the United States Department of Energy. The Government may have certain rights in the invention.