Method of manufacturing a semiconductor device and a semiconductor device
First Claim
1. A method of manufacturing a semiconductor device, comprising:
- forming a first semiconductor layer having a first composition over a semiconductor substrate;
forming a second semiconductor layer having a second composition over the first semiconductor layer;
forming another first semiconductor layer having the first composition over the second semiconductor layer;
forming a third semiconductor layer having a third composition over the another first semiconductor layer;
patterning the first semiconductor layers, second semiconductor layer, and third semiconductor layer to form a fin structure;
removing a portion of the third semiconductor layer thereby forming a nanowire comprising the second semiconductor layer; and
forming a conductive material surrounding the nanowire,wherein the first semiconductor layers, second semiconductor layer, and third semiconductor layer comprise different materials.
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Abstract
A method of manufacturing a semiconductor device includes forming a first semiconductor layer having a first composition over a semiconductor substrate, and forming a second semiconductor layer having a second composition over the first semiconductor layer. Another first semiconductor layer having the first composition is formed over the second semiconductor layer. A third semiconductor layer having a third composition is formed over the another first semiconductor layer. The first semiconductor layers, second semiconductor layer, and third semiconductor layer are patterned to form a fin structure. A portion of the third semiconductor layer is removed thereby forming a nanowire comprising the second semiconductor layer, and a conductive material is formed surrounding the nanowire. The first semiconductor layers, second semiconductor layer, and third semiconductor layer include different materials.
20 Citations
20 Claims
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1. A method of manufacturing a semiconductor device, comprising:
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forming a first semiconductor layer having a first composition over a semiconductor substrate; forming a second semiconductor layer having a second composition over the first semiconductor layer; forming another first semiconductor layer having the first composition over the second semiconductor layer; forming a third semiconductor layer having a third composition over the another first semiconductor layer; patterning the first semiconductor layers, second semiconductor layer, and third semiconductor layer to form a fin structure; removing a portion of the third semiconductor layer thereby forming a nanowire comprising the second semiconductor layer; and forming a conductive material surrounding the nanowire, wherein the first semiconductor layers, second semiconductor layer, and third semiconductor layer comprise different materials. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of manufacturing a semiconductor device, comprising:
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forming a fin structure over a semiconductor substrate in which first semiconductor layers A, second semiconductor layers B, and third semiconductor layers C are stacked in a repeating sequence ABAC, wherein the first semiconductor, second semiconductor, and third semiconductor layers comprise different materials; forming a sacrificial gate structure defining a gate region over the fin structure; removing the third semiconductor layers from source/drain regions of the fin structure, which are not covered by the sacrificial gate structure; forming source/drain epitaxial layers in the source/drain regions; removing the sacrificial gate structure; removing the third semiconductor layers from the gate region; and forming a gate electrode structure in the gate region, wherein the gate electrode structure wraps around the first and second semiconductor layers. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A method of manufacturing a semiconductor device, comprising:
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forming a first fin structure and a second fin structure, wherein in both the first fin structure and the second fin structure first semiconductor layers and second semiconductor layers are alternately stacked; forming a first sacrificial gate structure over the first fin structure and a second sacrificial gate structure over the second fin structure; forming a first protective layer over the second fin structure and the second sacrificial gate structure; removing the first semiconductor layers in a source/drain region of the first fin structure, which is not covered by the first sacrificial gate structure, thereby forming a first source/drain space; forming a first source/drain epitaxial layer in the first source/drain space, thereby forming a first structure; forming a second protective layer over the first fin structure and the first sacrificial gate structure; removing the second semiconductor layers in a source/drain region of the second fin structure, which is not covered by the second sacrificial gate structure, thereby forming a second source/drain space; forming a second source/drain epitaxial layer in the second source/drain space, thereby forming a second structure; removing the first sacrificial gate structure and the first semiconductor layer in the first gate region to form a first gate space; removing the second sacrificial gate structure and the second semiconductor layer in the second gate region to form a second gate space; forming first and second gate electrode structures in the first and second gate spaces, respectively, wherein the first semiconductor layer comprises a first sublayer and second sublayers disposed on opposing sides of the first sublayer, the first sublayer formed of an alloy comprising a first Group IV element and a second Group IV element, and the second sublayers formed of an alloy comprising the first Group IV element and the second Group IV element, the amounts of the first Group IV element and second Group IV element being different in the first sublayer and the second sublayers. - View Dependent Claims (19, 20)
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Specification