Terraced Wafer Layer Structure for Memory Cell Connectivity
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Solution Overview
Problem
Existing semiconductor devices face challenges in optimizing the arrangement and connectivity of conductive and insulating layers, leading to inefficiencies in memory cell performance and integration.
Innovation Solution
The semiconductor device employs a specific arrangement of conductive and insulating layers, with alternating stacking and terraced configurations to enhance connectivity and efficiency, utilizing terraced conductive layers and insulating members to improve memory cell integration and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive and insulating layers are alternately stacked in a conventional configuration, then device integration is achieved, but memory cell performance and connectivity are insufficient
Solution Approach 1:
The conductive layers are segmented into multiple sections along the stacking direction, with insulating layers positioned between them. This segmentation allows for optimized electrical connectivity within each segment while maintaining overall device integration, directly addressing the memory cell performance issue without requiring complete redesign of the entire layer stack.
Solution Approach 2:
Different regions of the layered structure are assigned different functional characteristics. Specifically, certain conductive layers are configured with enhanced connectivity in specific areas to optimize memory cell performance locally, while maintaining standard integration elsewhere, thus improving performance without uniformly increasing complexity throughout the entire device.
2Ease of operation
If conventional layer stacking is used, then device integration is achieved, but connectivity optimization is limited
Solution Approach 1:
The patent introduces a hierarchical dimension to the layer arrangement by positioning insulating layers at specific heights between conductive layers in the stacking direction. This dimensional optimization enables improved connectivity control without adding lateral complexity, allowing electricity to flow more efficiently through the vertical stack while maintaining integration efficiency.
3Reliability
If standard conductive layer arrangement is employed, then manufacturing is simplified, but memory cell integration performance is suboptimal
Solution Approach 1:
Insulating layers are pre-positioned between conductive layers during the stacking process, rather than being added afterward. This preliminary action ensures optimal integration performance from the outset, as the insulating layers are already in place to guide electrical connectivity and prevent short circuits during subsequent manufacturing steps, actually simplifying the overall manufacturing process.
Data Source
AI summary
A semiconductor device includes: a first wafer including die regions; conductive layers provided in a device region on the first wafer, and stacked in a stacking direction; and first layers provided in an edge region on the first wafer and arranged in the stacking direction. First die regions positioned within the device region include respective terrace regions in which a part of the conductive layers are provided. The number of the first layers arranged in the stacking direction at positions within second die regions corresponding to positions at which the first die regions include at least partial region of the terrace regions within a region in which the second die regions overlap with the edge region when viewed in the stacking direction is greater than the number of the conductive layers provided at the positions including the at least partial region of the terrace regions.