3D Memory Stack Layout With Separation Structure for Higher Density

The patent transitions from two-dimensional planar semiconductor devices to three-dimensional semiconductor memory devices by stacking multiple layers vertically. This dimensional change allows integration density to increase without requiring progressively finer and more expensive pattern formation techniques, as the additional storage capacity comes from the vertical stacking of memory cell layers rather than horizontal miniaturization.

The three-dimensional memory device is segmented into multiple distinct layers including first and second electrode patterns, first and second horizontal patterns, interface layers, and insulating layers. Each layer performs a specific function and can be manufactured using standardized processes. This segmentation allows the complex three-dimensional structure to be built through sequential deposition and patterning steps, making the manufacturing process more manageable despite the increased integration density.

Interface layers and insulating layers are introduced as intermediary structures between the vertically stacked electrode patterns and horizontal patterns. These intermediary layers serve multiple functions: they provide electrical isolation, facilitate selective etching processes, enable precise alignment through conformal deposition on underlying structures, and maintain structural integrity during manufacturing. The separation structures further act as intermediaries to define precise spatial relationships between adjacent memory cell strings, improving reliability while managing manufacturing precision requirements.