Patent ID: 9159604
Filing Date: 2015-10-13
Classification: H01L

Abstract:
1. A method of forming a device, comprising: forming a recess in a substrate comprising a semiconductor material, the recess comprising a lower portion and an upper portion disposed over the lower portion; oxidizing at least a portion of the substrate having the recess; after the oxidizing, depositing a dielectric layer in the recess, wherein a sidewall of the dielectric layer is in contact with and forms an interface with the semiconductor material of the substrate, the dielectric layer completely filling the lower portion of the recess, wherein the dielectric layer is deposited by subatomic chemical vapor deposition (SACVD) process, spin-on-glass process, flow-able CVD, or high density plasma (HDP); forming a capping layer over the substrate and the dielectric layer, wherein the capping layer comprises a bottom portion disposed within and completely filling the upper portion of the recess and a top portion disposed over the bottom portion and outside the recess, and wherein the bottom portion of the capping layer covers the interface; removing the top portion of the capping layer, while leaving the bottom portion of the capping layer over the dielectric layer; and forming a gate structure over the remaining capping layer.