Gate all around device and method of forming the same

Abstract

A method includes forming a p-well and an n-well in a substrate. The method further includes forming a stack of interleaving first semiconductor layers and second semiconductor layers over the p-well and the n-well, the first semiconductor layers having a first thickness and the second semiconductor layers having a second thickness different than the first thickness. The method further includes annealing the stack of interleaving semiconductor layers. The method further includes patterning the stack to form fin-shaped structures including a first fin-shaped structure over the n-well and a second fin-shaped structure over the p-well. The method further includes etching to remove the second semiconductor layers from the first and second fin-shaped structures, where the first semiconductor layers have a different thickness within each of the first and second fin-shaped structures after the etching. The method further includes forming a metal gate over the first and second fin-shaped structures.

Dependencies are inferred from the claim text.