Method for forming self-aligned contact in semiconductor device
First Claim
1. A method for forming a self-aligned contact in a semiconductor device, comprising the steps of:
- (a) providing a substrate having at least one gate structure and at least one junction region adjacent said gate structure;
(b) forming a first insulating layer along a profile of said gate structure and said junction region;
(c) forming a temporary layer on said first insulating layer;
(d) selectively removing a portion of said temporary layer while leaving a plug portion of said temporary layer over said junction region;
(e) forming a second insulating layer in a region where said portion of said temporary layer is removed;
(f) removing said plug portion to form a contact hole;
(g) removing a portion of said first insulating layer at a bottom of said contact hole; and
(h) forming a conductive contact in said contact hole;
wherein a third insulating layer is formed on side walls of said plug portion after said step
1 Assignment
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Accused Products
Abstract
A method for forming a self-aligned contact on a semiconductor substrate provided with a plurality of field-effect transistors. The method comprises the steps of forming a first insulating layer comprising a nitride along a profile of a gate structure and a junction region, forming a temporary layer comprising a doped oxide on the first insulating layer, removing a portion of the temporary layer by performing a selective etch of the oxide with a mask while leaving a plug portion of the temporary layer over the junction region, forming a second insulating layer comprising an undoped oxide in a region where the portion of the temporary layer is removed, removing the plug portion by performing a selective etch of the undoped oxide to form a contact hole, removing a portion of the first insulating layer at a bottom of the contact hole, and forming a conductive contact in the contact hole.
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Citations
20 Claims
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1. A method for forming a self-aligned contact in a semiconductor device, comprising the steps of:
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(a) providing a substrate having at least one gate structure and at least one junction region adjacent said gate structure;
(b) forming a first insulating layer along a profile of said gate structure and said junction region;
(c) forming a temporary layer on said first insulating layer;
(d) selectively removing a portion of said temporary layer while leaving a plug portion of said temporary layer over said junction region;
(e) forming a second insulating layer in a region where said portion of said temporary layer is removed;
(f) removing said plug portion to form a contact hole;
(g) removing a portion of said first insulating layer at a bottom of said contact hole; and
(h) forming a conductive contact in said contact hole;
wherein a third insulating layer is formed on side walls of said plug portion after said step - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10)
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2. (canceled)
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11. A method for forming a self-aligned contact in a semiconductor device, comprising the steps of:
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(a) providing a substrate having at least one gate structure and at least one junction region adjacent said gate structure;
(b) forming a first insulating layer comprising a nitride along a profile of said gate structure and said junction region;
(c) forming a temporary layer comprising a doped oxide on said first insulating layer;
(d) removing a portion of said temporary layer by performing a selective etch of the oxide with a mask while leaving a plug portion of said temporary layer over said junction region;
(e) forming a second insulating layer comprising an undoped oxide in a region where said portion of said temporary layer is removed;
(f) removing said plug portion by performing a selective etch of the doped oxide to form a contact hole;
(g) removing a portion of said first insulating layer at a bottom of said contact hole; and
(h) forming a conductive contact in said contact hole. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification