Method of making a FinFET device
First Claim
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1. A method for fabricating a fin field-effect transistor (FinFET) device, the method comprising:
- providing a substrate having a first fin at a first location;
epitaxially growing a second fin on the substrate at the first location, the epitaxially growth being performed at a first temperature; and
performing a thermal annealing at a second temperature in an oxygen ambient on the substrate with the second fin thereon, to grow an interface wrapping over the second fin,wherein the second temperature is higher than the first temperature.
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Abstract
A method for fabricating a fin field-effect transistor (FinFET) device includes providing a substrate having a first fin at a first location, and epitaxially growing a second fin on the substrate at the first location. The epitaxial growth is performed at a first temperature. The method further includes performing a thermal annealing at a second temperature in oxygen ambient on the substrate with the second fin thereon to grow an interface wrapping over the second fin. The second temperature is higher than the first temperature.
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Citations
20 Claims
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1. A method for fabricating a fin field-effect transistor (FinFET) device, the method comprising:
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providing a substrate having a first fin at a first location; epitaxially growing a second fin on the substrate at the first location, the epitaxially growth being performed at a first temperature; and performing a thermal annealing at a second temperature in an oxygen ambient on the substrate with the second fin thereon, to grow an interface wrapping over the second fin, wherein the second temperature is higher than the first temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for fabricating a fin field-effect transistor (FinFET) device, the method comprising:
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providing a substrate; recessing the substrate to form a plurality of first fins; forming isolation regions between the first fins on the substrate; recessing the first fins to form at least one recessing trench in the isolation regions; epitaxially growing silicon germanium (SiGe) layer with a first temperature in the recessing trench; recessing the isolation regions to expose an upper portion of the SiGe layer to form a SiGe fin; and performing a thermal anneal at a second temperature in an oxygen ambient to the SiGe fin to form a SiGe interface with a substantial different Ge concentration than the SiGe fin. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A method for fabricating a fin field-effect transistor (FinFET) device, the method comprising:
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providing a silicon (Si) substrate; etching back a portion of the Si substrate to form a plurality of Si fins; forming isolation regions between the Si fins; recessing the Si fins to form recessing trenches on the Si substrate; epitaixially growing a silicon germanium (SiGe) layer with a first temperature in the recessing trenches; recessing the isolation regions to expose an upper portion of the SiGe layer, wherein the upper portion of the SiGe layer forms a plurality of SiGe fins; performing a thermal annealing in an oxygen ambient on the SiGe fins by using a second temperature which is higher than the first temperature, wherein a conformal SiGe interface is formed that wraps over the SiGe fins, wherein the SiGe interface has a substantial higher Ge concentration than the SiGe fins, and wherein a SiO2 interface is formed over the SiGe interface; removing the SiO2 interface by an etching process; and after removing the SiO2 interface, forming a Si capping layer on the SiGe interface.
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Specification