Patent ID: 11876094
Assignee: NANYA TECHNOLOGY CORPORATION
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 1:
2. The method for fabricating the semiconductor device of claim 1, wherein in the first active region, the third insulating film is formed on an inner wall of the first trench, and the second conductive film is overlapped on the third insulating film in the first trench;
wherein in the second active region, the first insulating film is formed on an inner wall of the second trench, the second insulating film is overlapped on the first insulating film in the second trench, the third insulating film is overlapped on the second insulating film in the second trench, and the second conductive film is overlapped on the third insulating film in the second trench;
wherein in the third active region, the second insulating film is formed on an inner wall of the third trench, the third insulating film is overlapped on the second insulating film in the third trench, the first conductive film is overlapped on the third insulating film in the third trench, and the second conductive film is overlapped on the first conductive film in the third trench.