Chip Guard Layout for 3D Memory Reliability Under High Integration
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Solution Overview
Problem
The operational reliability of three-dimensional semiconductor devices deteriorates as the number of stacked memory cells increases, hindering the improvement of integration density.
Innovation Solution
A semiconductor device with a chip guard region structure featuring multiple chip guards and guard patterns, including long and short sidewalls, that enhance environmental reliability and connectivity through guard pads, ensuring proper spacing and alignment of components.
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 area occupied by memory cells per unit area is reduced, but the operational reliability of the three-dimensional semiconductor device deteriorates
Solution Approach 1:
The chip guard region is divided into multiple segments with first, second and third chip guards positioned at different locations. This segmentation allows the guard structure to provide comprehensive stress relief and protection across the entire chip surface, enabling higher integration density while maintaining operational reliability through distributed protection zones
Solution Approach 2:
The chip guard structure acts as an intermediary element between the stacked memory cells and the substrate. The guard pads and guard patterns serve as intermediate structures that transfer and distribute mechanical stress, protecting the memory cells from substrate-induced stress while allowing the stacked configuration to achieve higher integration density
2Reliability
If the chip guard region structure is designed with multiple chip guards and guard patterns to improve operational reliability, then the structural complexity increases, but the manufacturing precision requirements are maintained
Solution Approach 1:
Different regions of the chip are assigned different guard structures with specific local qualities. The first chip guard includes long sidewalls extending in the first direction, the second chip guard includes short sidewalls extending in the second direction, and the third chip guard is positioned at specific locations to address local stress conditions. This localized optimization provides comprehensive protection while maintaining manufacturability through region-specific design
Solution Approach 2:
The chip guard structure employs asymmetric design with long sidewalls and short sidewalls oriented in different directions. The first chip guard has long sidewalls extending in the first direction while the second chip guard has short sidewalls extending in the second direction. This asymmetric configuration optimizes stress distribution in different regions without requiring excessive manufacturing precision
3Reliability
If guard pads are positioned with specific spacing to connect guard patterns and improve structural integrity, then the manufacturing precision requirements increase, but the operational reliability is enhanced
Solution Approach 1:
The guard pads are positioned to extend beyond the minimum required coverage area, providing excessive protection margin. The first guard pattern and second guard pattern are connected through guard pads that are spaced apart but maintain overlapping or adjacent relationships in plan view. This partial overlap or close spacing provides redundant protection pathways, enhancing operational reliability while allowing for reasonable manufacturing tolerances
Data Source
AI summary
A semiconductor device includes: a substrate with a cell region and a chip guard region, the chip guard region surrounding the cell region; a first chip guard extending over the chip guard region in a first direction; a second chip guard extending over the chip guard region in the first direction, the second chip guard being spaced apart from the first chip guard; and a third chip guard extending over the chip guard region in a second direction, the second direction intersecting the first direction. The first chip guard includes a first end portion, the second chip guard includes a second end portion, and the third chip guard includes a third end portion that is disposed between the first end portion and the second end portion.