3D Semiconductor Memory Device With Insulated Bit Lines
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Solution Overview
Problem
The increasing integration of semiconductor memory devices poses challenges in converting them into three-dimensional forms, requiring innovative configurations and manufacturing methods to enhance performance and efficiency.
Innovation Solution
A semiconductor memory device configuration that includes a substrate with specific electrode and wiring arrangements, semiconductor layers, and memory portions, allowing for efficient data storage and retrieval while facilitating a compact layout and reducing noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If semiconductor memory devices are converted into three-dimensional forms to increase integration, then storage capacity and density are improved, but manufacturing complexity and process difficulty increase
Solution Approach 1:
The patent transitions from planar two-dimensional memory structures to three-dimensional stacked structures by forming bit lines and word lines in different vertical layers. Memory cells are arranged in multiple stacks along the vertical direction, with bit lines extending in the first direction and word lines in the second direction, creating a three-dimensional memory array that increases storage capacity while maintaining manufacturability through systematic layering
Solution Approach 2:
The memory device is divided into multiple independent memory cell regions, each with its own bit line and word line pairs. The bit lines are segmented into first bit lines and second bit lines, and word lines into first word lines and second word lines, allowing parallel processing and reducing the complexity of controlling any single large memory array
2Productivity
If electrodes and wirings are arranged in three-dimensional space, then data storage efficiency is improved, but noise interference between adjacent lines increases
Solution Approach 1:
Insulating layers are introduced as intermediary structures between conductive bit lines and word lines that are in close proximity in three-dimensional space. These insulating layers physically separate the conductive elements, preventing direct electrical interference while allowing the memory cells to maintain their three-dimensional stacked configuration for high storage efficiency
Solution Approach 2:
By arranging bit lines and word lines in different vertical layers separated by insulating layers, the patent utilizes the vertical dimension to spatially separate conductive elements that would otherwise be crowded in a planar arrangement. This three-dimensional separation reduces electromagnetic interference while maintaining high density
3Area of stationary object
If memory cells are arranged in a compact layout, then chip area is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The memory array is segmented into multiple memory cell regions with repeating patterns of bit lines and word lines. This modular segmentation allows manufacturing processes to focus on reproducing identical unit cells rather than placing each individual connection with high precision, reducing overall manufacturing difficulty while achieving compact layout
Solution Approach 2:
The insulating layers serve multiple functions simultaneously: they electrically isolate bit lines from word lines, provide structural support for the three-dimensional stacking, and define the geometric boundaries for pattern alignment during manufacturing. This multi-functionality reduces the number of separate manufacturing steps and precision requirements
Data Source
AI summary
A semiconductor memory device includes a substrate including a first region and a second region arranged in a first direction, and first electrodes arranged in a second direction. The first electrodes each include a pair of first parts disposed in the first region and arranged in a third direction, and a second part disposed in the second region and electrically connected to the first parts. The device includes first wirings arranged along one of the first parts, first semiconductor layers opposed to the one of the first parts and connected to the first wirings, first memory portions electrically connected to the first wirings via the first semiconductor layers, second wirings arranged along the other of the first parts, second semiconductor layers opposed to the other of the first parts and connected to the second wirings, and second memory portions electrically connected to the second wirings via the second semiconductor layers.