Methods of forming nanosheet transistor with dielectric isolation of source-drain regions and related structure
First Claim
1. A method of forming an integrated circuit (IC) structure, the method comprising:
- forming an insulative liner on an upper surface of a substrate, the substrate being included in a precursor structure, the precursor structure having;
a pair of laterally spaced transistor sites defined within the substrate, wherein the insulative liner is formed on the upper surface of the substrate laterally between the pair of transistor sites,a pair of nanosheet stacks, each positioned on one of the pair of transistor sites, anda pair of gate structures each positioned on a respective one of the pair of nanosheet stacks;
forming a sacrificial structure on the insulative liner, wherein the sacrificial structure includes;
a semiconductor mandrel positioned on the insulative liner, anda mask layer positioned on the semiconductor mandrel, wherein an upper surface of the mask layer is positioned above the pair of gate structures;
forming a pair of insulator regions, each of the pair of insulator regions positioned laterally between the sacrificial structure and one of the pair of transistor sites; and
removing the mask layer to expose the upper surface of the semiconductor mandrel; and
epitaxially growing a source/drain epitaxial region between the pair of nanosheet stacks, from exposed sidewalls of the pair of nanosheet stacks and the exposed upper surface of the semiconductor mandrel.
5 Assignments
0 Petitions
Accused Products
Abstract
An IC structure according to the disclosure includes: a substrate; a pair of transistor sites positioned on the substrate, wherein an upper surface of the substrate laterally between the pair of transistor sites defines a separation region; a pair of nanosheet stacks, each positioned on one of the pair of transistor sites; an insulative liner conformally positioned on the upper surface of the substrate within the separation region, and a sidewall surface of each of the pair of transistor sites; a semiconductor mandrel positioned on the insulative liner and over the separation region; a pair of insulator regions each positioned laterally between the semiconductor mandrel and the insulative liner on the sidewall surfaces of each of the pair of transistor sites; and a source/drain epitaxial region positioned over the pair of insulator regions and the semiconductor mandrel, wherein the source/drain epitaxial region laterally abuts the pair of nanosheet stacks.
-
Citations
14 Claims
-
1. A method of forming an integrated circuit (IC) structure, the method comprising:
-
forming an insulative liner on an upper surface of a substrate, the substrate being included in a precursor structure, the precursor structure having; a pair of laterally spaced transistor sites defined within the substrate, wherein the insulative liner is formed on the upper surface of the substrate laterally between the pair of transistor sites, a pair of nanosheet stacks, each positioned on one of the pair of transistor sites, and a pair of gate structures each positioned on a respective one of the pair of nanosheet stacks; forming a sacrificial structure on the insulative liner, wherein the sacrificial structure includes; a semiconductor mandrel positioned on the insulative liner, and a mask layer positioned on the semiconductor mandrel, wherein an upper surface of the mask layer is positioned above the pair of gate structures; forming a pair of insulator regions, each of the pair of insulator regions positioned laterally between the sacrificial structure and one of the pair of transistor sites; and removing the mask layer to expose the upper surface of the semiconductor mandrel; and epitaxially growing a source/drain epitaxial region between the pair of nanosheet stacks, from exposed sidewalls of the pair of nanosheet stacks and the exposed upper surface of the semiconductor mandrel. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A method of forming an integrated circuit (IC) structure, the method comprising:
-
forming a first pair of transistor sites and a second pair of transistor sites from a substrate, wherein a lateral separation distance between the first pair of transistor sites is less than a separation distance between the second pair of transistor sites, and wherein each of the first pair of transistor sites and the second pair of transistor sites includes a pair of nanosheet stacks each positioned on a respective one of the pair of transistor sites, and a pair of gate structures each positioned on a respective one of the pair of transistor sites; selectively forming an insulative region between the first pair of transistor sites to cover a first portion of the substrate between the first pair of transistor sites, wherein the second pair of transistor sites and a second portion of the substrate between the second pair of transistor sites remain exposed after the selective forming of an insulative liner; epitaxially growing a first source/drain epitaxial region between the first pair of semiconductor transistor sites, from exposed portions of the pair of nanosheet stacks on the first pair of transistor sites, such that the first source/drain epitaxial region overlies the insulative region; and epitaxially growing a second source/drain epitaxial region between the second pair of semiconductor transistor sites, from the second portion of the substrate and exposed portions of the pair of nanosheet stacks on the second pair of transistor sites. - View Dependent Claims (9, 10, 11, 12, 13, 14)
-
Specification