Vertical Memory Devices With Dummy Channels For Structural Stability
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Solution Overview
Problem
Vertical memory devices with increasing levels of stacked memory cells face structural instability issues.
Innovation Solution
A vertical memory device design featuring a conductive pattern structure with interleaved conductive patterns and insulation layers, where edges of the conductive patterns form staircase-like pads with varying widths and densities of dummy channel structures, providing a stable structure through the arrangement of these components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of levels in vertical memory device is increased, then storage capacity is improved, but structural stability deteriorates
Solution Approach 1:
The patent applies local quality by introducing dummy channel structures with specifically engineered varying widths at different locations within the memory device. These dummy channels are strategically placed to provide localized structural support where needed most, particularly in regions experiencing higher mechanical stress due to the increased number of stacked levels. The non-uniform width distribution allows each region to have optimized structural properties tailored to its specific mechanical requirements.
Solution Approach 2:
The patent employs composite material principles by integrating dummy channel structures made from materials with different mechanical properties into the existing memory device architecture. These dummy channels are formed as composite structures combining sacrificial materials during fabrication that are later removed, leaving behind voids or filled structures that provide enhanced mechanical support. The composite nature of these support structures allows optimization of both structural integrity and electrical isolation properties.
2Stability of the object's composition
If dummy channel structures with varying widths are introduced, then structural stability is improved, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by incorporating dummy channel structures during the initial fabrication process of the memory device. These structures are formed simultaneously with the main channel structures through the same deposition and etching sequences, using sacrificial materials that are later removed. This preliminary integration avoids the need for separate post-fabrication steps to add structural support, thereby reducing overall process complexity despite the varying width requirements.
Solution Approach 2:
The patent utilizes parameter changes by varying the width of dummy channel structures according to specific design criteria during the fabrication process. The width parameter of dummy channels is adjusted in different regions to optimize structural support while maintaining compatibility with standard fabrication processes. This parameter variation is achieved through controlled deposition thicknesses and etching conditions rather than requiring complex lithographic patterning steps.
Data Source
AI summary
A vertical memory device includes a conductive pattern structure on a first region of a substrate, the conductive pattern structure including a stack of interleaved conductive patterns and insulation layers. A pad structure is disposed on a second region of the substrate adjacent the first region of the substrate wherein edges of the conductive patterns are disposed at spaced apart points along a first direction to provide conductive pads arranged as respective steps in a staircase arrangement. A plurality of channel structures extends through the conductive pattern structure and a plurality of dummy channel structures extends through the pad structure. Respective contact plugs are disposed on the conductive pads. Numbers of the dummy channel structures per unit area passing through the conductive pads vary. Widths of the dummy channel structures passing through the conductive pads may also vary.