Patent ID: 11972972
Assignee: WINBOND ELECTRONICS CORP.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A manufacturing method of an isolation structure, comprising:
forming a trench at a surface of the substrate;
forming a mask pattern on the substrate, wherein the mask pattern has an opening communicated with the trench;
filling a first isolation material layer in the trench and the opening, wherein a surface of the first isolation material layer defines a first recess;
filling a second isolation material layer into the first recess;
removing a portion of the second isolation material layer and a portion of the first isolation material layer, to form a second recess in the opening of the mask pattern;
performing a first ion implantation process, during which first ions strike the second recess from a first side of the second recess, to form a first damage region at least in the first isolation material layer;
performing a second ion implantation process, during which second ions strike the second recess from a second side of the second recess, to form a second damage region at least in the first isolation material layer, wherein the first and second sides are opposite sides of the second recess;
performing a decoupled plasma treatment, to transform a portion of the first damage region and a portion of the second damage region into a protection layer, wherein the protection layer has an etching selectivity with respect to the first and second damage regions; and
removing the first and second damage regions, wherein the isolation structure at least comprises remained portions of the first isolation material layer.