Patent ID: 11862461
Assignee: CHANGXIN MEMORY TECHNOLOGIES, INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 1:
2. The method of claim 1, wherein doping the substrate on which the isolation structure is formed, to form the first doped area on one side of the isolation structure and to form the second doped area on another side of the isolation structure comprises:
forming a patterned second mask layer on the first substrate on which the isolation structure is formed and the germanium-silicon substrate, wherein the patterned second mask layer exposes a surface of the first substrate;
performing first ion implantation on the first substrate by using the patterned second mask layer as a mask, to form the first doped area;
removing the patterned second mask layer;
forming a patterned third mask layer on the first substrate on which the isolation structure and the first doped area are formed and the germanium-silicon substrate, wherein the patterned third mask layer exposes a surface of the germanium-silicon substrate;
performing second ion implantation on the germanium-silicon substrate and the second substrate in contact with a lower surface of the germanium-silicon substrate by using the patterned third mask layer as a mask, to form the second doped area; and
removing the patterned third mask layer.