Integrated circuit structure with substrate isolation and un-doped channel
First Claim
1. A method of fabricating a circuit device, the method comprising:
- receiving a substrate having a first semiconductor layer of a first semiconductor material and a second semiconductor layer of a second semiconductor material on the first semiconductor layer, wherein the second semiconductor material is different from the first semiconductor material in composition;
patterning the first semiconductor layer, the second semiconductor layer, and the substrate to form a fin structure that includes the first semiconductor layer, the second semiconductor layer, and a patterned portion of the substrate; and
performing a selective oxidization process to the first semiconductor layer, such that a bottom portion of the first semiconductor layer is fully oxidized while a top portion of the first semiconductor layer directly above the oxidized bottom portion and the patterned portion of the substrate directly below the oxidized bottom portion remain un-oxidized.
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Abstract
The present disclosure provides a method of fabricating a nonplanar circuit device. The method includes receiving a substrate having a first semiconductor layer of a first semiconductor material and a second semiconductor layer of a second semiconductor material on the first semiconductor layer, wherein the second semiconductor material is different from the first semiconductor material in composition. The method further includes patterning the first and second semiconductor layers to form a fin structure in the first and second semiconductor layers. The method further includes performing a selective oxidization process to the first semiconductor layer such that a bottom portion of the first semiconductor layer is oxidized.
15 Citations
20 Claims
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1. A method of fabricating a circuit device, the method comprising:
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receiving a substrate having a first semiconductor layer of a first semiconductor material and a second semiconductor layer of a second semiconductor material on the first semiconductor layer, wherein the second semiconductor material is different from the first semiconductor material in composition; patterning the first semiconductor layer, the second semiconductor layer, and the substrate to form a fin structure that includes the first semiconductor layer, the second semiconductor layer, and a patterned portion of the substrate; and performing a selective oxidization process to the first semiconductor layer, such that a bottom portion of the first semiconductor layer is fully oxidized while a top portion of the first semiconductor layer directly above the oxidized bottom portion and the patterned portion of the substrate directly below the oxidized bottom portion remain un-oxidized. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of fabricating a circuit device, the method comprising:
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receiving a substrate having a first semiconductor layer of a first semiconductor material and a second semiconductor layer of a second semiconductor material on the first semiconductor layer, wherein the second semiconductor material is different from the first semiconductor material in composition; patterning the first and second semiconductor layers to form a fin structure in the first and second semiconductor layers; forming a dummy gate over a channel region of the fin structure; removing the dummy gate, thereby resulting in a gate trench; and performing a selective oxidization process to the first semiconductor layer such that a top portion of the first semiconductor layer within the gate trench is oxidized and a substantial portion of the second semiconductor layer within the gate trench is not oxidized. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A method of fabricating a circuit device, the method comprising:
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receiving a substrate having a first semiconductor layer of a first semiconductor material and a second semiconductor layer of a second semiconductor material on the first semiconductor layer, wherein the second semiconductor material is different from the first semiconductor material in composition; patterning the first and second semiconductor layers to form a fin structure in the second semiconductor layer; performing a first selective oxidization process to the first semiconductor layer such that a bottom portion of the first semiconductor layer is oxidized; forming a dummy gate over a channel region of the fin structure; removing the dummy gate, thereby resulting in a gate trench; and performing a second selective oxidization process to the first semiconductor layer such that a top portion of the first semiconductor layer within the gate trench is oxidized. - View Dependent Claims (18, 19, 20)
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Specification