Inkjet Ink
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United States of America Patent
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Issued Date -
Sep 15, 2011
app pub date -
Oct 30, 2009
filing date -
Nov 4, 2008
priority date (Note) -
Abandoned
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Abstract
An inkjet ink comprises phosphoric acid; one or more solvents for the phosphoric acid, preferably ethyl lactate and water; and one or more aprotic organic sulfoxides, preferably dimethyl sulfoxide (DMSO) or dimethyl sulfone (SMSO.sub.2). The inks do not leave a carbon residue on heating and so are suited to use in etching and/or doping silicon wafers, e.g. in the production of crystalline silicon solar cells.
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