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Fabrication of solar cells with counter doping prevention

United States Patent

February 19, 2013
View the Complete Patent at the US Patent & Trademark Office
A solar cell fabrication process includes printing of dopant sources over a polysilicon layer over backside of a solar cell substrate. The dopant sources are cured to diffuse dopants from the dopant sources into the polysilicon layer to form diffusion regions, and to crosslink the dopant sources to make them resistant to a subsequently performed texturing process. To prevent counter doping, dopants from one of the dopant sources are prevented from outgassing and diffusing into the other dopant source. For example, phosphorus from an N-type dopant source is prevented from diffusing to a P-type dopant source comprising boron.
Dennis; Timothy D. (Canton, TX), Li; Bo (San Jose, CA), Cousins; Peter John (Menlo Park, CA)
SunPower Corporation (San Jose, CA)
12/ 828,573
July 1, 2010
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT This disclosure was made with Government support under Contract No. DEFC36-07GO17043 awarded by the United States Department of Energy.