3D Memory Stack Layout With Dummy Region for Stable Fabrication
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Solution Overview
Problem
Existing three-dimensional semiconductor memory devices face challenges in improving integration density and stability during manufacturing processes.
Innovation Solution
The semiconductor memory device incorporates a semiconductor substrate with distinct regions, including a memory cell array, a scribe region, and a chip guard region, featuring a gate stack structure, channel structure, dummy stack structure, and void-containing patterns to enhance integration and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the stacked number of memory cells is increased to improve integration density, then the degree of integration improves, but the manufacturing stability deteriorates due to process complexity
Solution Approach 1:
The substrate is divided into distinct regions: a first region for the memory cell array and a second region for the dummy stack structure. This segmentation allows the memory cells to be stacked vertically to increase integration density while the dummy structure region provides a controlled environment for manufacturing processes, thereby maintaining manufacturing stability despite increased stacking complexity.
Solution Approach 2:
A chip guard structure is introduced as an intermediary element that penetrates through the dummy stack structure. This chip guard structure acts as a protective barrier and process guide during manufacturing, enabling stable production of high-density stacked memory cells while protecting the underlying substrate and ensuring consistent fabrication across multiple chips.
2Quantity of substance
If more manufacturing processes are added to increase integration density, then the productivity improves, but the manufacturing precision deteriorates due to process complexity
Solution Approach 1:
The dummy stack structure is configured with specific local properties in the second region, including alternating conductive and insulating layers that differ from the memory cell region. This local quality differentiation allows precise control of manufacturing processes in each region, maintaining high precision even as integration density increases through additional stacking processes.
Solution Approach 2:
The chip guard structure penetrates through multiple layers at controlled depths and positions, with its geometry and material properties specifically optimized for each manufacturing stage. By carefully controlling parameters such as penetration depth, width, and material composition, the chip guard structure enables precise manufacturing of high-density stacked memory cells despite the complexity of multiple processing steps.
Data Source
AI summary
A semiconductor memory device includes: a semiconductor substrate including a first region and a second region; a memory cell array over the first region of the semiconductor substrate; a dummy stack structure over the second region of the semiconductor substrate; a chip guard structure penetrating the dummy stack structure; and a void-containing structure penetrating the dummy stack structure.