Patent ID: 6764917
Filing Date: 2004-07-20
Classification: H01L

Abstract:
A method of manufacturing a semiconductor device, comprising the steps of:providing a silicon layer over an insulating layer, the silicon layer including a first portion and a second portion; partially removing the first portion of the silicon layer, wherein a thickness of the second portion is greater than a thickness of the first portion; and forming a first transistor in the first portion and a second transistor in the second portion, wherein: the first transistor includes first source/drain regions and the second transistor includes second source/drain regions, and a depth of the second source/drain regions is greater than a depth of the first source/drain regions, the first source/drain regions are formed with a first dopant and the second source/drain regions are formed with a second dopant, and the diffusivity of the second dopant into silicon is greater than the diffusivity of the first dopant into silicon.