Patent ID: 11552089

Abstract:
Embodiments of 3D memory devices and methods for forming the same are disclosed. In an example, a 3D memory device includes a substrate having a first side and a second side opposite to the first side. The 3D memory device also includes a memory stack including interleaved conductive layers and dielectric layers at the first side of the substrate. The 3D memory device also includes a plurality of channel structures each extending vertically through the memory stack. The 3D memory device also includes a first insulating structure extending vertically through the memory stack and extending laterally to separate the plurality of channel structures into a plurality of blocks. The 3D memory device further includes a first doped region in the substrate and in contact with the first insulating structure. The 3D memory device further includes a first contact extending vertically from the second side of the substrate to be in contact with the first doped region.