3D Memory Block Layout Using Dummy Slits to Mitigate Edge Defects
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Solution Overview
Problem
Three-dimensional (3D) memory architectures face structural instabilities and defects due to increasing height, leading to reduced memory capacity and fabrication yield, as stresses cause distortions in slit structures, rendering multiple memory blocks inoperable.
Innovation Solution
Incorporating dummy memory blocks at the edges of memory planes with alternating discontinuous slit structures to stabilize functional memory blocks, reducing stress and defects, and increasing the number and height of functional memory blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the height of functional memory blocks is increased to improve storage density, then memory capacity increases, but structural instabilities and defects increase due to stresses causing distortions in slit structures
Solution Approach 1:
The patent applies preliminary action by fabricating dummy memory blocks before functional memory blocks to pre-establish stress compensation mechanisms. These dummy blocks are intentionally created to absorb and mitigate stresses that would otherwise distort slit structures in functional blocks, thereby preventing defects before they occur during the stacking process.
Solution Approach 2:
The patent uses dummy memory blocks as intermediary elements between the substrate and functional memory blocks. These intermediary blocks serve as stress buffers that mediate the mechanical stresses transmitted through the structure, protecting the slit structures in functional blocks from distortion while enabling increased stacking height for higher capacity.
2Quantity of substance
If more memory blocks are stacked vertically to increase storage density, then memory capacity increases, but the number of defects increases rendering multiple memory blocks inoperable
Solution Approach 1:
The patent converts the harmful effect of stresses into a beneficial outcome by intentionally creating dummy memory blocks that are designed to fail or absorb stress. These dummy blocks transform the potentially harmful stresses into a protective mechanism that prevents defects in functional memory blocks, thereby enabling higher stacking densities without proportionally increasing defect rates.
Solution Approach 2:
The patent employs dummy memory blocks as disposable sacrificial elements that are intentionally designed to be non-functional or short-lived. These blocks serve as stress victims that absorb mechanical stresses and defects, protecting the valuable functional memory blocks. By sacrificing these dummy blocks, the overall reliability and yield of functional storage capacity are improved.
3Ease of manufacture
If continuous slit structures are used to separate memory blocks, then manufacturing is simplified, but structural stability decreases due to stress concentrations
Solution Approach 1:
The patent applies segmentation by dividing continuous slit structures into discontinuous segments within dummy memory blocks. This segmentation breaks up stress concentration paths that would otherwise propagate through continuous slits, thereby enhancing structural stability. The segmented slits in dummy blocks act as stress interrupters while still providing adequate separation between functional memory blocks.
Solution Approach 2:
The patent implements local quality by applying different slit structure characteristics to different regions of the memory device. Continuous slit structures are used in functional memory blocks for manufacturing simplicity, while discontinuous segmented slits are used in dummy memory blocks for stress management. This localized differentiation optimizes both ease of manufacture and structural stability in their respective contexts.
Data Source
AI summary
Structures of a three-dimensional (3D) memory device and systems containing the same are disclosed. In one example, the 3D memory device includes a memory plane, where the memory plane includes a first edge and an array of blocks. The array of blocks includes a plurality of memory blocks configured to store data, where the plurality of memory blocks are separated by continuous slit structures, and a first dummy region between the first edge and the plurality of memory blocks. The first dummy region includes alternating first slit structures and second slit structures, where the first slit structures and the second slit structures are discontinuous slit structures.