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Front contact solar cell with formed electrically conducting layers on the front side and backside

United States Patent

8,207,444
June 26, 2012
View the Complete Patent at the US Patent & Trademark Office
A bipolar solar cell includes a backside junction formed by a silicon substrate and a first doped layer of a first dopant type on the backside of the solar cell. A second doped layer of a second dopant type makes an electrical connection to the substrate from the front side of the solar cell. A first metal contact of a first electrical polarity electrically connects to the first doped layer on the backside of the solar cell, and a second metal contact of a second electrical polarity electrically connects to the second doped layer on the front side of the solar cell. An external electrical circuit may be electrically connected to the first and second metal contacts to be powered by the solar cell.
Cousins; Peter John (Menlo Park, CA)
SunPower Corporation (San Jose, CA)
12/ 166,266
July 1, 2008
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT The invention described herein was made with Governmental support under contract number DE-FC36-07G017043 awarded by the United States Department of Energy. The Government may have certain rights in the invention.