3D Semiconductor Memory Device Staircase Structure
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Solution Overview
Problem
Two-dimensional semiconductor devices face limitations in integration due to the need for expensive process equipment to achieve finer pattern formation, which restricts their ability to increase data storage capacity and performance.
Innovation Solution
A three-dimensional semiconductor memory device is developed with a staircase structure of interlayer insulating layers and gate electrodes, featuring vertical channel structures and contact plugs that enhance integration density without requiring extreme fine pattern formation techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If two-dimensional or planar semiconductor devices are used, then manufacturing process is simpler, but integration density and data storage capacity are limited
Solution Approach 1:
The patent transitions from two-dimensional planar structures to three-dimensional vertical structures by stacking multiple layers of memory cells, interlayer insulating layers, and gate electrodes. This vertical stacking enables higher integration density without requiring extreme fine pattern formation techniques, effectively resolving the contradiction between manufacturing simplicity and integration density.
2Quantity of substance
If finer pattern formation is achieved in two-dimensional devices, then integration density increases, but expensive process equipment is required
Solution Approach 1:
By moving to three-dimensional vertical channel structures and stacked architectures, the patent achieves high integration density through vertical stacking rather than horizontal miniaturization. This approach avoids the need for expensive extreme ultraviolet (EUV) lithography equipment required for sub-10nm patterning in traditional planar devices.
Solution Approach 2:
The memory device is divided into multiple stacked layers including alternating layers of interlayer insulating material and gate electrodes, with vertical channel structures penetrating through these layers. This segmentation into discrete functional layers enables modular manufacturing and achieves high density without requiring single-step fine patterning of the entire structure.
3Quantity of substance
If three-dimensional stacked structure is implemented, then integration density increases, but manufacturing precision requirements increase
Solution Approach 1:
The three-dimensional structure is segmented into discrete layers that can be manufactured and aligned incrementally. Each layer (interlayer insulating layer, gate electrode layer) is formed separately and stacked sequentially, allowing for process control and alignment compensation at each stage rather than requiring perfect single-step alignment of the entire stack.
Solution Approach 2:
Interlayer insulating layers serve as intermediary elements between gate electrode layers, providing both electrical isolation and mechanical alignment references. These insulating layers act as spacers and alignment guides that facilitate precise stacking of subsequent layers without requiring extreme precision in a single manufacturing step.
Data Source
AI summary
A three-dimensional semiconductor memory device includes a substrate including a first region and a second region, the second region extending from the first region; a stack including interlayer insulating layers and gate electrodes, which are alternately and repeatedly stacked on the substrate, the stack having a staircase structure on the second region; an insulating layer covering the staircase structure of the stack; first vertical channel structures on the first region, penetrating the stack, and in contact with the substrate; first contact plugs on the second region and penetrating the insulating layer and the stack; and first insulating pads in the insulating layer and enclosing upper portions of the first contact plugs, respectively, wherein the first insulating pads overlap with the first vertical channel structures in a horizontal direction.