Semiconductor device structure and method for forming the same
First Claim
1. A semiconductor device structure, comprising:
- a substrate having a doped region in an upper portion of the substrate, wherein the doped region is doped with first dopants of a first conduction type;
at least one fin structure over the substrate, wherein a first dopant concentration of the doped region exposed by the fin structure is greater than a second dopant concentration of the doped region covered by the fin structure;
an isolation layer over the substrate and surrounding the fin structure;
a gate over the isolation layer and the fin structure; and
a source structure and a drain structure over the fin structure and at two opposite sides of the gate, wherein the source structure and the drain structure are doped with second dopants of a second conduction type, and the second conduction type is opposite to the first conduction type.
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Accused Products
Abstract
A semiconductor device structure is provided. The semiconductor device structure includes a substrate having a doped region in an upper portion of the substrate. The doped region is doped with first dopants of a first conduction type. The semiconductor device structure includes one fin structure over the substrate. A first dopant concentration of the doped region exposed by the fin structure is greater than a second dopant concentration of the doped region covered by the fin structure. The semiconductor device structure includes an isolation layer over the substrate and at two opposite sides of the fin structure. The semiconductor device structure includes a gate over the isolation layer and the fin structure.
10 Citations
18 Claims
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1. A semiconductor device structure, comprising:
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a substrate having a doped region in an upper portion of the substrate, wherein the doped region is doped with first dopants of a first conduction type; at least one fin structure over the substrate, wherein a first dopant concentration of the doped region exposed by the fin structure is greater than a second dopant concentration of the doped region covered by the fin structure; an isolation layer over the substrate and surrounding the fin structure; a gate over the isolation layer and the fin structure; and a source structure and a drain structure over the fin structure and at two opposite sides of the gate, wherein the source structure and the drain structure are doped with second dopants of a second conduction type, and the second conduction type is opposite to the first conduction type. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A semiconductor device structure, comprising:
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a substrate having a doped region in an upper portion of the substrate, wherein the doped region is doped with first dopants of a first conduction type, the substrate comprises a lower portion, the upper portion is over the lower portion, and a first width of the upper portion is less than a second width of the lower portion; at least one fin structure over the substrate; a first diffusion layer over the substrate and a first lower portion of a first sidewall of the fin structure, wherein the first diffusion layer comprises second dopants, and the second dopants and the first dopants are made of a same material; an isolation layer over the first diffusion layer; and a gate over the isolation layer and the fin structure. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A method for forming a semiconductor device structure, comprising:
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providing a substrate, a fin structure, a dielectric layer, and a mask layer, wherein the fin structure is over the substrate, the dielectric layer is over the fin structure, and the mask layer is over the dielectric layer; performing an implantation process on the substrate exposed by the mask layer to form doped regions in the substrate; forming an isolation layer over the substrate; removing the dielectric layer and the mask layer; performing an annealing process on the substrate to enlarge the doped regions so as to merge the doped regions into a merged doped region; and form a gate over the fin structure and the isolation layer. - View Dependent Claims (15, 16, 17, 18)
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Specification