3D Memory Cell Stack Structure for High-Density Stability
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Solution Overview
Problem
Conventional semiconductor memory devices face challenges in miniaturization and high integration while maintaining reliability, as further down-scaling of memory cells is limited.
Innovation Solution
A semiconductor memory device with a three-dimensional arrangement of memory cells, including a first stack structure with memory cells and a core region electrically connected to the memory cell region, featuring tapered semiconductor patterns and cell capacitors for enhanced electrical and structural stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If memory cells are further miniaturized through conventional down-scaling, then integration density increases, but reliability deteriorates due to structural instability
Solution Approach 1:
The patent transitions from planar two-dimensional memory cell arrangement to three-dimensional vertical stacking, where memory cells are arranged in multiple layers along the vertical direction. This dimensional change enables higher integration density while maintaining structural stability through the stacked architecture, directly resolving the contradiction between miniaturization and reliability.
Solution Approach 2:
The patent implements a stacked memory structure where multiple memory cell layers are nested vertically, with each layer containing complete memory cell structures including transistors and capacitors. This nesting approach increases integration density by utilizing vertical space while maintaining the structural integrity of each individual memory cell, thereby improving reliability during miniaturization.
2Quantity of substance
If memory cells are arranged in three-dimensional stacked structure, then integration density improves, but manufacturing complexity increases
Solution Approach 1:
The patent divides the three-dimensional memory structure into multiple identical or similar memory cell layers stacked vertically. Each layer contains standardized memory cell structures with consistent patterns of transistors and capacitors. This segmentation into repeating units simplifies the manufacturing process by allowing standardization of fabrication steps across layers, reducing the complexity burden despite the three-dimensional arrangement.
Solution Approach 2:
The patent employs preliminary patterning and formation of common structures (such as substrate structures, insulating layers, and electrode patterns) that are shared across multiple memory cell layers before final assembly. By preparing these foundational elements in advance and reusing them across layers, the manufacturing complexity is reduced while achieving high integration density through vertical stacking.
3Ease of manufacture
If conventional planar memory cell structure is used, then manufacturing is simpler, but further miniaturization is limited
Solution Approach 1:
The patent overcomes the miniaturization limit of conventional planar structures by transitioning to three-dimensional vertical stacking. This dimensional change allows continued increase in integration density without requiring further reduction of individual cell dimensions, thereby maintaining manufacturing simplicity while achieving higher integration levels that would be impossible with planar scaling alone.
Data Source
AI summary
The inventive concepts provide a semiconductor memory device including a first stack structure including a memory cell region, the memory cell region including a plurality of memory cells three-dimensionally arranged, the plurality of memory cells including a plurality of cell capacitors, a second stack structure including a core region at a position vertically overlapping the memory cell region, and the core region electrically connected to the memory cell region. The first stack structure comprises a first substrate, a first semiconductor pattern on the first substrate in the memory cell region, the first semiconductor pattern extending in a first direction parallel to a top surface of the first substrate, a word line surrounding the first semiconductor pattern and the word line extending in a second direction, the second direction being parallel to the top surface of the first substrate.