Paste composition and solar cell employing the same
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United States of America Patent
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May 6, 2008
Grant Date -
Jan 8, 2004
app pub date -
Jul 2, 2003
filing date -
Jan 30, 2002
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Abstract
A paste composition for forming an electrically conductive layer on a p-type silicon semiconductor substrate comprises aluminum powder, an organic vehicle and powder of at least one inorganic compound selected from a group consisting of an oxide-based inorganic compound and a non-oxide-based inorganic compound. The oxide-based inorganic compound has a thermal expansion coefficient smaller than the thermal expansion coefficient of aluminum and a melting temperature, a softening temperature and a decomposition temperature each higher than the melting point of aluminum. The non-oxide-based inorganic compound has a thermal expansion coefficient smaller than the thermal expansion coefficient of aluminum and at least one of a melting temperature, a softening temperature or a decomposition temperature higher than the melting point of aluminum. A solar cell comprises an electrically conductive layer formed by applying the paste composition having the aforementioned characteristics onto a p-type silicon semiconductor substrate and thereafter firing the paste composition.
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