Method of removing a via fence
First Claim
1. In a damascene process of fabricating an interconnect structure in an integrated circuit, a method for removing a via fence, comprising the steps of:
- etching back a plug in the interconnect structure using a plug etch back time that is short enough to substantially eliminate a probability of forming a via facet, while providing a high probability of forming a via fence; and
wetting the interconnect structure with an acid for a sufficient length of time to remove the via fence.
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Accused Products
Abstract
A method of fabricating a dual damascene structure includes etching a via through a first dielectric layer above a substrate, a barrier layer on the first dielectric layer, and a second dielectric layer on the barrier layer. The via is at least partially filled with a photoresist plug. The plug is etched back. A trench is etched through the second dielectric layer. The trench is aligned with the via. The substrate having the first and second dielectric layers thereon is wet with an acid for a sufficient length of time to remove a via fence formed in the trench. The via and the trench are filled with metal.
11 Citations
13 Claims
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1. In a damascene process of fabricating an interconnect structure in an integrated circuit, a method for removing a via fence, comprising the steps of:
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etching back a plug in the interconnect structure using a plug etch back time that is short enough to substantially eliminate a probability of forming a via facet, while providing a high probability of forming a via fence; and
wetting the interconnect structure with an acid for a sufficient length of time to remove the via fence. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of fabricating a dual damascene structure, comprising the steps of:
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(a);
etching a via through a first dielectric layer above a substrate, a barrier layer on the first dielectric layer, and a second dielectric layer on the barrier layer;
(b);
at least partialy filling the via with a photoresist plug;
(c);
etching back the plug using a plug etch back time that is short enough to substantially eliminate a probability of forming a via facet, while providing a high probability of forming a via fence;
(d);
etching a trench through the second dielectric layer, the trench aligned with the via;
(e);
wetting the substrate having the first and second dielectric layers thereon with an acid for a sufficient length of time to remove the via fence formed in the trench; and
(f);
filling the via and the trench with metal. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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Specification