Method for epitaxial re-growth of semiconductor region
First Claim
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1. A method comprising:
- forming Shallow Trench Isolation (STI) regions extending from a top surface of a semiconductor substrate into the semiconductor substrate;
etching a portion of the semiconductor substrate between opposite sidewalls of the STI regions to form a recess;
performing a treatment on a surface of the semiconductor substrate, with the surface being in the recess, wherein the treatment is performed using process gases comprising;
an oxygen-containing gas; and
an etching gas capable of etching the semiconductor substrate;
performing an epitaxy to grow a second semiconductor region starting from the surface; and
after the performing the epitaxy, recessing the STI regions.
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Abstract
A treatment is performed on a surface of a first semiconductor region, wherein the treatment is performed using process gases including an oxygen-containing gas and an etching gas for etching the semiconductor material. An epitaxy is performed to grow a second semiconductor region on the surface of the first semiconductor region.
350 Citations
20 Claims
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1. A method comprising:
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forming Shallow Trench Isolation (STI) regions extending from a top surface of a semiconductor substrate into the semiconductor substrate; etching a portion of the semiconductor substrate between opposite sidewalls of the STI regions to form a recess; performing a treatment on a surface of the semiconductor substrate, with the surface being in the recess, wherein the treatment is performed using process gases comprising; an oxygen-containing gas; and an etching gas capable of etching the semiconductor substrate; performing an epitaxy to grow a second semiconductor region starting from the surface; and after the performing the epitaxy, recessing the STI regions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method comprising:
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forming Shallow Trench Isolation (STI) regions extending from a top surface of a semiconductor substrate into the semiconductor substrate; etching a portion of the semiconductor substrate between opposite sidewalls of the STI regions to form a recess, wherein the portion of the semiconductor substrate comprises a top surface in the recess; performing a treatment on the top surface, wherein the treatment is performed using process gases comprising; an oxygen-containing gas; and an etching gas capable of etching the semiconductor substrate; after the treatment, performing a cleaning on the top surface; and after the treatment, performing an epitaxy to grow a semiconductor region in the recess; after the epitaxy, recessing the STI regions. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method comprising:
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forming Shallow Trench Isolation (STI) regions extending from a first top surface of a silicon substrate into the silicon substrate; etching a portion of the silicon substrate between opposite sidewalls of the STI regions to form a recess, wherein the silicon substrate comprises a second top surface in the recess; performing a treatment on the second top surface, wherein the treatment is performed using process gases comprising CF4 and O2; after the treatment, performing a cleaning on the second top surface of the silicon substrate; performing an epitaxy to grow a germanium-containing semiconductor region in the recess, wherein the germanium-containing semiconductor region is grown from the second top surface in the recess; and forming a Fin Field-Effect Transistor (FinFET) comprising; after the epitaxy, recessing the STI regions, wherein a top portion of the germanium-containing semiconductor region over the recessed STI regions forms a fin; forming a gate dielectric on sidewalls and a top surface of the fin; and forming a gate electrode over the gate dielectric. - View Dependent Claims (17, 18, 19, 20)
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Specification