METHOD FOR PRODUCING ELECTRICALLY CONDUCTIVE CONTACTS ON SOLAR CELLS, AND SOLAR CELL
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United States of America Patent
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Issued Date -
Jan 2, 2014
app pub date -
Dec 15, 2011
filing date -
Dec 16, 2010
priority date (Note) -
Abandoned
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Abstract
A method for producing contacts made of electrically conductive material on solar cells is provided. The method includes applying a dopant source to at least one face of a substrate; forming phosphosilicate glass by diffusing dopant into the substrate in a first thermal step; locally applying laser radiation to the substrate in regions in which the electrically conductive material is to be applied in order to form the electrically conductive contact; measuring the layer resistivity developed in the surface region of the substrate on the dopant source side; applying the electrically conductive material to the lasered areas; measuring the specific contact resistance between the lasered area and the electrically conductive material; determining a pulse energy density range of the laser beam from the measured values; applying laser radiation having a pulse energy density within the determined pulse energy density range.
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