Patent ID: 11864371
Assignee: CHANGXIN MEMORY TECHNOLOGIES, INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method for manufacturing a semiconductor structure, comprising:
providing a substrate, the substrate having a first surface and a second surface opposite to each other, and transistors being arranged on the second surface;
forming release holes in the substrate, the release holes extending into the transistors, bottoms of the release holes being located in channel regions of the transistors, and top surfaces of the release holes being flush with the first surface; and
forming a conductive structure in the release holes, the conductive structure extending to outside of the release holes and covering the first surface above the substrate;
wherein the forming release holes in the substrate comprises:
forming a mask layer on the first surface;
forming a photoresist layer on the mask layer, and patterning the photoresist layer to form a mask pattern in the photoresist layer, the mask pattern comprising a plurality of first openings and bumps for separating the first openings, and projections of the first openings in the transistors being located in sources of the transistors; and
removing the mask layer, the substrate, the sources of the transistors and part of the channel regions of the transistors that are exposed in the first openings, to form the release holes;
wherein the removing the mask layer, the substrate, the sources of the transistors and part of the channel regions of the transistors that are exposed in the first openings, to form the release holes comprises:
forming an oxide layer on side walls of the first openings, the oxide layer extending to outside of the first openings and covering a top surface of the mask layer, and the oxide layer located in the first openings enclosing second openings; and
removing the mask layer, the substrate, the sources of the transistors and part of the channel regions of the transistors that are exposed in the second openings, to form the release holes.