Fabrication of a vertical fin field effect transistor with a reduced contact resistance
First Claim
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1. A method of forming a vertical fin field effect transistor (vertical fmFET) with a reduced source/drain contact resistance, comprising:
- forming one or more doped regions in a substrate;
forming a plurality of vertical fins on at least one of the one or more doped regions;
heat treating the one or more doped regions in the substrate and the plurality of vertical fins on the at least one of the one or more doped regions to diffuse dopant from the doped region in contact with the plurality of vertical fins into a lower portion of each of the plurality of vertical fins;
removing an upper portion of at least one of the plurality of vertical fins, wherein the lower portion of the at least one of the plurality of vertical fins remains as an extension on the at least one of the one or more doped regions; and
forming a bottom source/drain contact on the extension and the at least one of the one or more doped regions.
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Abstract
A method of forming a vertical fin field effect transistor (vertical finFET) with an increased surface area between a source/drain contact and a doped region, including forming a doped region on a substrate, forming one or more interfacial features on the doped region, and forming a source/drain contact on at least a portion of the doped region, wherein the one or more interfacial features increases the surface area of the interface between the source/drain contact and the doped region compared to a flat source/drain contact-doped region interface.
22 Citations
8 Claims
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1. A method of forming a vertical fin field effect transistor (vertical fmFET) with a reduced source/drain contact resistance, comprising:
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forming one or more doped regions in a substrate; forming a plurality of vertical fins on at least one of the one or more doped regions; heat treating the one or more doped regions in the substrate and the plurality of vertical fins on the at least one of the one or more doped regions to diffuse dopant from the doped region in contact with the plurality of vertical fins into a lower portion of each of the plurality of vertical fins; removing an upper portion of at least one of the plurality of vertical fins, wherein the lower portion of the at least one of the plurality of vertical fins remains as an extension on the at least one of the one or more doped regions; and forming a bottom source/drain contact on the extension and the at least one of the one or more doped regions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification