3D Flash Memory Electrode Layers for Uniform Threshold Voltage
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Solution Overview
Problem
Three-dimensional flash memory devices face challenges in achieving uniform threshold voltage distribution and stress levels due to variations in electrode and interlayer insulation layers, leading to data credibility issues.
Innovation Solution
Differentiating the physical structures or materials of electrode and interlayer insulation layers, with specific configurations such as varying thicknesses, materials, and surface patterns, to achieve uniform threshold voltages and stress levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If electrode layers and interlayer insulation layers are made with uniform properties, then manufacturing is simpler, but threshold voltage distribution becomes non-uniform and stress levels vary
Solution Approach 1:
The patent applies local quality by differentiating electrode layers into first and second electrode layers with different physical structures or materials. The first electrode layer has a structure optimized for its specific functional requirements, while the second electrode layer has a different structure tailored to its requirements. This localized differentiation ensures uniform threshold voltage distribution across the memory device by compensating for position-dependent variations in the three-dimensional structure.
Solution Approach 2:
The patent segments the electrode system into multiple distinct electrode layers (first electrode layer and second electrode layer) with different properties. This segmentation allows each layer to be independently optimized for its specific function and position within the three-dimensional memory structure, thereby achieving uniform threshold voltage distribution without requiring complete structural redesign of the entire device.
2Manufacturing precision
If interlayer insulation layers are made with uniform properties, then manufacturing is simpler, but stress levels become non-uniform across the memory structure
Solution Approach 1:
The patent applies local quality to interlayer insulation layers by differentiating them into first and second interlayer insulation layers with different physical structures or materials. Each interlayer insulation layer is designed with properties specifically suited to its position and stress requirements within the three-dimensional memory structure, ensuring uniform stress distribution while maintaining manufacturing feasibility through localized rather than global complexity.
3Reliability
If all electrode layers have the same material properties, then manufacturing is easier, but electrical transfer characteristics vary due to position in the stack
Solution Approach 1:
The patent applies local quality by assigning different materials or physical structures to different electrode layers based on their specific electrical requirements. The first electrode layer uses a material or structure optimized for its electrical transfer characteristics, while the second electrode layer uses a different material or structure tailored to its requirements. This localized optimization ensures uniform electrical performance across the three-dimensional memory structure without requiring complex multi-step fabrication processes for each layer.
Data Source
AI summary
Embodiments of the present invention enable threshold voltage distribution of a plurality of electrode layers to be improved by configuring each of the plurality of electrode layer maintains to have different physical structures or materials, etc., thereby enhancing credibility during a process of maintaining stores data and a reading process.