3D Memory Key Pattern Layout for Alignment and Reliability
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Solution Overview
Problem
Current semiconductor memory devices face challenges in achieving high data storage density and reliability in three-dimensional arrangements, which affects their performance and efficiency.
Innovation Solution
The development of three-dimensional semiconductor memory devices with a specific stack structure and dummy structure configuration, including vertically stacked electrodes, a vertical channel structure, interlayer dielectric layers, and a capping layer, which enhances data storage capacity and reliability by improving the alignment and connection of memory cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If three-dimensional arrangements of memory cells are used to increase data storage capacity, then data storage density is improved, but manufacturing precision and alignment reliability deteriorate
Solution Approach 1:
The patent introduces a key pattern formation process that occurs before subsequent layer deposition. This key pattern serves as a pre-established alignment reference that guides the positioning of overlying structures, ensuring precise alignment in the vertical stacking process while enabling increased storage capacity through three-dimensional arrangement.
Solution Approach 2:
The key pattern acts as an intermediary element between the substrate and the stacked memory structures. It provides a stable reference framework that mediates the alignment relationship between different layers, allowing the three-dimensional memory cells to be precisely positioned without compromising manufacturing accuracy.
2Quantity of substance
If three-dimensional arrangements of memory cells are used to increase data storage capacity, then data storage density is improved, but device reliability deteriorates
Solution Approach 1:
The key pattern is formed in advance to establish reliable alignment references before the memory structures are stacked. This preliminary alignment framework ensures that each layer is correctly positioned, preventing misalignment defects that would compromise device reliability while enabling the high-density three-dimensional configuration.
Solution Approach 2:
The key pattern serves as a feedback reference for alignment verification during the stacking process. By providing visible and measurable alignment markers, it enables real-time monitoring and correction of positioning accuracy, ensuring that each stacked layer maintains proper registration with underlying structures, thereby preserving device reliability.
Data Source
AI summary
A semiconductor device include; a substrate including a cell array region and a key region, a stack structure on the cell array region including vertically stacked electrodes, a dummy structure on the key region, a vertical channel structure penetrating the stack structure to connect the substrate, a dummy pillar penetrating the first dummy structure, an interlayer dielectric layer on the stack structure and the dummy structure, wherein an upper portion of the interlayer dielectric layer on the dummy structure includes a key pattern that vertically overlaps the dummy pillar, and a capping layer on the key region and covering the key pattern.