Ruthenium and ruthenium dioxide removal method and material
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United States of America Patent
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Dec 7, 2004
Issued Date -
N/A
app pub date -
Dec 18, 2002
filing date -
Sep 3, 1998
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Expired
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Abstract
A method for removing at least a portion of a structure, such as a layer, film, or deposit, including ruthenium metal and/or ruthenium dioxide includes contacting the structure with a material including ceric ammonium nitrate. A material for removing ruthenium metal and amorphous ruthenium dioxide includes ceric ammonium nitrate and may be in the form of an aqueous solution including ceric ammonium nitrate and optionally, other solid or liquid solutes providing desired properties. In one application, the method and material may be utilized to etch, shape, or pattern layers or films of ruthenium metal and/or ruthenium dioxide in the fabrication of semiconductor systems and their elements, components, and devices, such as wires, electrical contacts, word lines, bit lines, interconnects, vias, electrodes, capacitors, transistors, diodes, and memory devices.
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