Patent ID: 7067408
Filing Date: 2006-06-27
Classification: H01L

Abstract:
1. A method for fabricating a semiconductor device, comprising: forming a stack layer of a gate layer, a poly-silicon layer, a tungsten layer, and a hard mask sequentially deposited on a semiconductor substrate; carrying out a selective oxidation process adopting a rapid thermal process (RTP), wherein the poly-silicon layer of the stack layer is only oxidized; performing a heat treatment process by slowly increasing a temperature of a LPCVD furnace from a room temperature to a target temperature for the heat treatment process and keeping the target temperature in a vacuum ambient; decreasing the temperature of the LPCVD furnace from the target temperature for the heat treatment process to a target temperature for depositing a gate sealing nitride layer; and carrying out a process for forming the gate sealing nitride layer on the heat treated stack layer.