Source and drain process for FinFET
First Claim
1. A method for manufacturing a FinFET, the method comprising:
- forming a fin structure on a substrate;
depositing a dielectric layer on the fin structure;
forming a dummy gate crossing over the dielectric layer;
forming two spacers respectively crossing over the dielectric layer abutting two opposite sidewalls of the dummy gate;
performing a first etching operation on portions of the dielectric layer and the fin structure beside and covered by the two spacers, thereby forming two first recesses respectively peripherally enclosed by the two spacers; and
performing a second etching operation on the fin structure in the first recesses, thereby forming two second recesses peripherally enclosed by the dielectric layer, wherein the second recesses respectively communicate with the first recesses.
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Accused Products
Abstract
A FinFET includes a fin structure on a substrate; a dielectric layer provided on the fin structure; a metal gate crossing over the dielectric layer; two spacers respectively crossing over the dielectric layer abutting two opposite sidewalls of the metal gate, each of the two spacers having a length along a direction parallel to a longitudinal axis of the fin structure; and a source and a drain. Each of the source and the drain having a first portion peripherally enclosed by the dielectric layer, and a second portion peripherally enclosed by the two spacers, in which the length of each of the two spacers is greater than a length of the second portion, and a length of a combination of the first portion and the second portion is greater than the length of each of the two spacers.
13 Citations
20 Claims
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1. A method for manufacturing a FinFET, the method comprising:
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forming a fin structure on a substrate; depositing a dielectric layer on the fin structure; forming a dummy gate crossing over the dielectric layer; forming two spacers respectively crossing over the dielectric layer abutting two opposite sidewalls of the dummy gate; performing a first etching operation on portions of the dielectric layer and the fin structure beside and covered by the two spacers, thereby forming two first recesses respectively peripherally enclosed by the two spacers; and performing a second etching operation on the fin structure in the first recesses, thereby forming two second recesses peripherally enclosed by the dielectric layer, wherein the second recesses respectively communicate with the first recesses. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for manufacturing a FinFET, the method comprising:
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forming a fin structure on a substrate; depositing a dielectric layer on a top surface and side surfaces of the fin structure, wherein the fin structure and the dielectric layer are formed from different materials; forming a dummy gate crossing over the dielectric layer by using a deposition process and an etching process; forming two spacers respectively crossing over the dielectric layer abutting two opposite sidewalls of the dummy gate, each of the two spacers having a length along a direction parallel to a longitudinal axis of the fin structure, wherein the two spacers and the fin structure are formed from different materials; performing one or more etching operations on portions of the dielectric layer and the fin structure beside and covered by the two spacers, thereby forming two recesses peripherally enclosed by the two spacers, the two recesses having a first portion partially enclosed by the dielectric layer and second portion not enclosed by the dielectric layer; performing a wet clean operation on the two recesses; and performing an epitaxy operation on the substrate to form a source in one of the two recesses and to form a drain in the other one of the two recesses, thereby forming the source and the drain each of which having a first portion peripherally enclosed by the dielectric layer, and a second portion peripherally enclosed by the two spacers, wherein the length of each of the two spacers is greater than a length of the second portion, and a length of a combination of the first portion and the second portion is greater than the length of each of the two spacers. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A FinFET comprising:
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a substrate; a fin structure on the substrate; a dielectric layer provided on the fin structure; a metal gate crossing over the dielectric layer; two spacers respectively crossing over the dielectric layer abutting two opposite sidewalls of the metal gate, each of the two spacers having a length along a direction parallel to a longitudinal axis of the fin structure, wherein; and a source and a drain, each of the source and the drain having a first portion peripherally enclosed by the dielectric layer, and a second portion peripherally enclosed by the two spacers, wherein the length of each of the two spacers is greater than a length of the second portion, and a length of a combination of the first portion and the second portion is greater than the length of each of the two spacers. - View Dependent Claims (17, 18, 19, 20)
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Specification