FinFET and method of fabricating the same
First Claim
1. A method of fabricating a fin field effect transistor (FinFET) comprising:
- providing a substrate having a first insulation region and a second insulation region having respective top surfaces, and a fin between the first and second insulation regions, wherein the top surfaces of the first and second insulation regions are below a top surface of the fin;
forming a gate stack over a portion of the fin and over a portion of the first and second insulation regions;
recessing a portion of the fin not covered by the gate stack to form a recessed portion of the fin below the top surfaces of the first and second insulation regions;
etching corners of the top surfaces of the first and second insulation regions not covered by the gate stack to form tapered top surfaces of the first and second insulation regions; and
selectively growing a strained material over the recessed portion of the fin and the tapered top surfaces of the first and second insulation regions.
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Accused Products
Abstract
The disclosure relates to a fin field effect transistor (FinFET). An exemplary structure for a FinFET comprises a substrate comprising a top surface; a first insulation region and a second insulation region over the substrate top surface comprising tapered top surfaces; a fin of the substrate extending above the substrate top surface between the first and second insulation regions, wherein the fin comprises a recessed portion having a top surface lower than the tapered top surfaces of the first and second insulation regions, wherein the fin comprises a non-recessed portion having a top surface higher than the tapered top surfaces; and a gate stack over the non-recessed portion of the fin.
425 Citations
20 Claims
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1. A method of fabricating a fin field effect transistor (FinFET) comprising:
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providing a substrate having a first insulation region and a second insulation region having respective top surfaces, and a fin between the first and second insulation regions, wherein the top surfaces of the first and second insulation regions are below a top surface of the fin; forming a gate stack over a portion of the fin and over a portion of the first and second insulation regions; recessing a portion of the fin not covered by the gate stack to form a recessed portion of the fin below the top surfaces of the first and second insulation regions; etching corners of the top surfaces of the first and second insulation regions not covered by the gate stack to form tapered top surfaces of the first and second insulation regions; and selectively growing a strained material over the recessed portion of the fin and the tapered top surfaces of the first and second insulation regions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of making a semiconductor structure, comprising:
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forming a plurality of fin structures on a substrate; forming a plurality of insulation structures, each pair of adjacent two of the insulation structures sandwiching a corresponding one of the fin structures, top surfaces of the insulation structures being lower than top surfaces of the fin structures; partially recessing the fin structures to form a plurality of recessed portions of the fin structures, top surfaces of the recessed portions being lower than the top surfaces of the insulation structures, and the insulation structures and recessed portions of the fin structures defining a plurality of trenches; partially removing corners of the top surfaces of the insulation structures to enlarge widths of top portions of the trenches; and growing a strain-inducing structure filling the trenches, the strain-inducing structure having a top surface higher than the top surfaces of the insulation structures, and the strain-inducing structure being arranged to strain the plurality of fin structures. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A method of making a semiconductor structure, comprising:
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forming a plurality of insulation structures over a substrate; forming a plurality of trenches, each of the plurality of trenches being between two corresponding insulation structures of the plurality of insulation structures, and the trenches exposing portions of the substrate; shaping top portions of the insulation structures to have tapered top surfaces after the formation of the plurality of trenches; and growing a silicon-containing structure on the exposed portions of substrate, the silicon-containing structure filling the trenches and covering the corresponding tapered top surfaces between the trenches. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification