Dual stress liner device and method
First Claim
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1. A method of manufacturing a semiconductor device, comprising the steps of:
- depositing a first stress liner on a silicon layer;
depositing a second stress liner on the silicon layer, wherein a portion of said second stress liner overlaps a portion of said first stress liner above a top of an interconnect structure;
polishing said second stress liner to remove only said portion of said second stress liner overlapping said portion of said first stress liner above the top of the interconnect structure, wherein said polishing uses said first stress liner and a portion of the second stress liner as a stopper, and wherein said polishing leaves the first stress liner above the interconnect structure; and
forming first and second conductive contacts through said first and second stress liners, respectively.
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Abstract
A dual stress liner manufacturing method and device is described. Overlapping stress liner layers of opposite effect (e.g., tensile versus compression) may be deposited over portions of the device, and the uppermost overlapping layer may be polished down in a process that uses the bottom overlapping layer as a stopper. An insulating film may be deposited on the stress liner layers before the polishing, and another insulating film may be deposited above the first insulating film after the polishing. Contacts may be formed such that the contacts need only penetrate one stress liner layer to reach a transistor well or gate structure.
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Citations
20 Claims
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1. A method of manufacturing a semiconductor device, comprising the steps of:
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depositing a first stress liner on a silicon layer; depositing a second stress liner on the silicon layer, wherein a portion of said second stress liner overlaps a portion of said first stress liner above a top of an interconnect structure; polishing said second stress liner to remove only said portion of said second stress liner overlapping said portion of said first stress liner above the top of the interconnect structure, wherein said polishing uses said first stress liner and a portion of the second stress liner as a stopper, and wherein said polishing leaves the first stress liner above the interconnect structure; and forming first and second conductive contacts through said first and second stress liners, respectively. - View Dependent Claims (2, 3, 4, 5, 6, 7, 13, 14, 17, 18)
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8. A method of manufacturing a semiconductor device, comprising the steps of:
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forming first and second pluralities of transistor wells on a semiconductor substrate; depositing a first stress liner contacting said first plurality of said wells; depositing a second stress liner contacting said second plurality of said wells, wherein a portion of said second stress liner overlaps a portion of said first stress liner above a top of an interconnect structure; depositing a first insulating film on said stress liners; polishing said first insulating film and said second stress liner to remove only said portion of said second stress liner overlapping said portion of said first stress liner above the top of the interconnect structure, wherein said polishing uses said first stress liner and a portion of the second stress liner as a stopper, and wherein said polishing leaves the first stress liner above the interconnect structure; depositing a second insulating film on said first insulating film after said polishing; forming first and second contacts through said first and second stress liners, respectively. - View Dependent Claims (9, 10, 11, 12, 15, 16, 19, 20)
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Specification