Patent ID: 10790301

Abstract:
Embodiments of three-dimensional (3D) memory devices and methods for forming the same are disclosed. In an example, a method for forming a 3D memory device is disclosed. A channel structure extending vertically through a dielectric stack including interleaved sacrificial layers and dielectric layers is formed above a substrate. A dummy channel structure extending vertically through the dielectric stack is formed. An elevating dielectric layer is formed on a dummy dielectric layer. A slit opening extending vertically through the elevating dielectric layer, dummy dielectric layer, and dielectric stack is formed. A memory stack including interleaved conductor layers and the dielectric layers is formed above the substrate by gate replacement. A source contact is formed in the slit opening by depositing a source conductor layer on the elevating dielectric layer and in the slit opening. The source conductor layer on the elevating dielectric layer and at least a part of the elevating dielectric layer are removed.