Patent ID: 11956941
Assignee: CHANGXIN MEMORY TECHNOLOGIES, INC.
Field: nan (nan)
Classification: CPC H | IPC H

Claim 0:
1. A manufacturing method for memory, comprising the following steps:
providing a substrate, the substrate comprising a first functional region and a second functional region;
forming a first isolation layer on the substrate;
forming a first mask layer with pattern regions on the first isolation layer, the pattern region comprising a first pattern region corresponding to the first functional region and a second pattern region corresponding to the second functional region, the first pattern region comprising a plurality of first mask walls and first trenches formed between the adjacent first mask walls, and the second pattern region comprising a plurality of second mask walls and second trenches formed between the adjacent second mask walls;
forming a second isolation layer on the first mask layer and on the first isolation layer exposed in the first trenches and the second trenches, the second isolation layer forming third trenches in the first trenches and fourth trenches in the second trenches;
forming a second mask layer on the second isolation layer, the second mask layer filling the third trenches and the fourth trenches and covering a top surface of the second isolation layer, and the second mask layer having a first recessed portion corresponding to the first pattern region and a second recessed portion corresponding to the second pattern region;
removing part of the second mask layer and part of the second isolation layer, a top surface of a remaining second isolation layer being flush with a top surface of the first mask layer, and a top surface of the remaining second mask layer being equal to or smaller than the top surface of the first mask layer and larger than a top surface of the first isolation layer;
removing the first mask layer and the remaining second mask layer;
forming a third mask layer on the first isolation layer and the remaining second isolation layer;
removing part of the third mask layer, a top surface of a remaining third mask layer being flush with the top surface of the remaining second isolation layer; and
etching the remaining part of the second isolation layer and the first isolation layer below the second isolation layer, by taking the remaining third mask layer as a mask; and forming a first functional pattern corresponding to the first functional region and a second functional pattern corresponding to the second functional region.