发明名称 |
TITANIUM OXYNITRIDE HARD MASK FOR LITHOGRAPHIC PATTERNING |
摘要 |
A vertical stack including a dielectric hard mask layer and a titanium nitride layer is formed over an interconnect-level dielectric material layer such as an organosilicate glass layer. The titanium nitride layer may be partially or fully converted into a titanium oxynitride layer, which is subsequently patterned with a first pattern. Alternately, the titanium nitride layer, with or without a titanium oxynitride layer thereupon, may be patterned with a line pattern, and physically exposed surface portions of the titanium nitride layer may be converted into titanium oxynitride. Titanium oxynitride provides etch resistance during transfer of a combined first and second pattern, but can be readily removed by a wet etch without causing surface damages to copper surfaces. A chamfer may be formed in the interconnect-level dielectric material layer by an anisotropic etch that employs any remnant portion of titanium nitride as an etch mask. |
申请公布号 |
US2014199832(A1) |
申请公布日期 |
2014.07.17 |
申请号 |
US201313741638 |
申请日期 |
2013.01.15 |
申请人 |
CORPORATION INTERNATIONAL BUSINESS MACHINES |
发明人 |
Nguyen Son V.;Vo Tuan A.;Waskiewicz Christopher J. |
分类号 |
H01L21/48 |
主分类号 |
H01L21/48 |
代理机构 |
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代理人 |
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主权项 |
1. A method of forming a patterned structure comprising:
forming a vertical stack including an interconnect-level dielectric material layer, a dielectric hard mask layer, and a patterned titanium oxynitride layer defining a first pattern over a substrate; forming a patterned lithographic material stack including at least a patterned photoresist layer over said titanium oxynitride layer, said patterned photoresist layer defining a second pattern; and etching said interconnect-level dielectric material layer employing a combination of said patterned lithographic material stack and said patterned titanium oxynitride layer to form a cavity embedded within said interconnect-level dielectric material layer. |
地址 |
US |