Patent ID: 11881428
Assignee: CHANGXIN MEMORY TECHNOLOGIES, INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 5:
6. A semiconductor structure, comprising:
a substrate;
a trench structure, the trench structure being located in the substrate;
a first dielectric layer, the first dielectric layer covering a bottom and part of a side wall of the trench structure, and a top surface of the first dielectric layer being lower than a top surface of the trench structure; and
a protective layer, the protective layer being located in the trench structure, and at least covering a surface of the first dielectric layer and part of the side wall of the trench structure,
wherein the substrate comprises an array area, and a peripheral area located at a periphery of the array area; the trench structure comprises a first trench structure, a second trench structure, a third trench structure, and a fourth trench structure; the first trench structure and the second trench structure are both located in the array area; and the third trench structure and the fourth trench structure are both located in the peripheral area;
wherein the first dielectric layer fills the first trench structure without a gap, and cover the bottoms and part of ide walls of the second trench structure, the third trench structure and the fourth trench structure; a top of the first dielectric layer in the first trench structure is lower than a top of the first trench structure; a top of the first dielectric layer in the second trench structure is lower than a top of the second trench structure; a top of the first dielectric layer in the third trench structure is lower than a top of the third trench structure; and a top of the first dielectric layer in the fourth trench structure is lower than a top of the fourth trench structure;
wherein the protective layer fills completely the first trench structure, the second trench structure, and the third trench structure, and covers a surface of the first dielectric layer in the fourth trench structure and part of a side wall of the fourth trench structure.