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

Claim 0:
1. A manufacturing method for a semiconductor structure, comprising:
providing a substrate, and forming a trench structure in the substrate;
forming a first dielectric layer in the trench structure, a top surface of the first dielectric layer being lower than a top surface of the trench structure; and
forming a protective layer in the trench structure, and the protective layer at least covering a surface of the first dielectric layer and part of a 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 said forming the first dielectric in the trench structure comprises:
forming a first dielectric material layer in the first trench structure, the second trench structure, the third trench structure, and the fourth trench structure as well as on a surface of the substrate, the first dielectric material layer filling completely the first trench structure and covering the bottoms and side walls of the second trench structure, the third trench structure and the fourth trench structure; and
removing the first dielectric material layer located on the surface of the substrate, and removing part of first dielectric material layer located in the trench structure so as to form the first dielectric layer,

wherein said forming the protective later in the trench structure comprises:
forming the protective material layer in the first trench structure, the second trench structure, the third trench structure and the fourth trench structure as well as on the surface of the substrate, and the protective material layer filling completely the first trench structure, the second trench structure and the third trench structure, and covering the surface of the first dielectric layer in the fourth trench structure.