NANOSHEET ISOLATION FOR BULK CMOS NON-PLANAR DEVICES
First Claim
1. A semiconductor structure comprising:
- a semiconductor substrate including a first device region and a second device region, wherein first trench isolation structures surround said first and second device regions and extend below first and second pedestal portions of said semiconductor substrate;
a first semiconductor material fin stack located above said first pedestal portion of said semiconductor substrate;
a second semiconductor material fin stack located above said second pedestal portion of said semiconductor substrate; and
second trench isolation structures located at ends of each first semiconductor material fin stack and said second semiconductor material fin stack, wherein a portion of one of said second trench isolation structures is located directly between a bottommost surface of said first semiconductor material fin stack and said first pedestal portion of said semiconductor substrate and another of said second trench isolation structures is located directly between a bottommost surface of said second semiconductor material fin stack and said second pedestal portion of said semiconductor substrate.
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Abstract
A semiconductor structure is provided that includes a semiconductor substrate including a first device region and a second device region. First trench isolation structures surround the first and second device regions and extend below first and second pedestal portions of the semiconductor substrate. A first semiconductor material fin stack is located above the first pedestal portion of the semiconductor substrate, and a second semiconductor material fin stack is located above the second pedestal portion of the semiconductor substrate. Second trench isolation structures are located at ends of each first and second semiconductor material fin stacks. A portion of each second trench isolation structure is located directly between a bottommost surface of the first or second semiconductor material fin stack and the first or second pedestal portion of the semiconductor substrate.
27 Citations
20 Claims
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1. A semiconductor structure comprising:
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a semiconductor substrate including a first device region and a second device region, wherein first trench isolation structures surround said first and second device regions and extend below first and second pedestal portions of said semiconductor substrate; a first semiconductor material fin stack located above said first pedestal portion of said semiconductor substrate; a second semiconductor material fin stack located above said second pedestal portion of said semiconductor substrate; and second trench isolation structures located at ends of each first semiconductor material fin stack and said second semiconductor material fin stack, wherein a portion of one of said second trench isolation structures is located directly between a bottommost surface of said first semiconductor material fin stack and said first pedestal portion of said semiconductor substrate and another of said second trench isolation structures is located directly between a bottommost surface of said second semiconductor material fin stack and said second pedestal portion of said semiconductor substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of forming a semiconductor structure, said method comprising:
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providing a first semiconductor nanowire material stack located in a first device region of a semiconductor substrate and a second semiconductor nanowire material stack located in a second device region of the semiconductor substrate, wherein said first semiconductor nanowire material stack is located on a first sacrificial silicon germanium alloy portion and said second semiconductor nanowire material stack is located on a second sacrificial silicon germanium alloy portion and wherein a first trench isolation structure surrounds each of said first and second semiconductor nanowire material stacks; forming an isolation spacer along an upper portion of each first trench isolation structure; removing an entirety of said first and second sacrificial silicon germanium alloy portions to provide an opening within said first and second device regions, each opening having a portion directly beneath said first and second semiconductor nanowire material stacks; and forming a second trench isolation structure within each opening, wherein a portion of said second trench isolation structure with each opening extends directly beneath said first and second semiconductor nanowire material stacks. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification