Patent ID: 11915946
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 6:
7. A device comprising:
a stack of nanostructures over a substrate, wherein the stack of nanostructures comprise:
a first nanosheet of a first thickness, wherein the first nanosheet is spaced apart from the substrate by a first distance;
a second nanosheet of a second thickness, wherein the second thickness is greater than the first thickness, wherein the second nanosheet is spaced apart from the first nanosheet by a second distance, and wherein the second distance is equal to the first distance; and
a third nanosheet of a third thickness, wherein the third thickness is greater than the second thickness, wherein the third nanosheet is spaced apart from the second nanosheet by a third distance, and wherein the third distance is equal to the second distance, wherein the first nanosheet is disposed between the substrate and the second nanosheet, wherein the second nanosheet is disposed between the first nanosheet and the third nanosheet, and wherein the first nanosheet, the second nanosheet, and the third nanosheet comprise a same first material;

an electrode wrapping around the first nanosheet, the second nanosheet, and the third nanosheet, wherein a first portion of the electrode and a second portion of the electrode is separated by the third nanostructure, wherein a first spacer extends along a sidewall of the first portion of the electrode, wherein the first spacer comprises a second material, wherein a second spacer extends along a sidewall of the second portion of the electrode, wherein the second spacer comprises a third material, and wherein the second material is different from the third material; and
a first insulating layer disposed between the electrode and the first nanosheet, a second insulating layer disposed between the electrode and the second nanosheet, and a third insulating layer disposed between the electrode and the third nanosheet, wherein the third insulating layer is disposed between the second portion of the electrode and the second spacer, wherein the first insulating layer, the second insulating layer, and the third insulating layer comprise a same fourth material different from the first material.