Semiconductor Memory Bit Line Insulation via Boundary Buried Patterns
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Solution Overview
Problem
The challenge in manufacturing highly integrated semiconductor memory devices with miniaturized patterns is the need for novel and expensive exposure techniques, which are not effectively addressed by existing technologies.
Innovation Solution
A semiconductor memory device design that includes a substrate with a cell array region and a boundary region, featuring recess regions, bit lines, buried insulation patterns, and spacer patterns, where the boundary buried insulation pattern covers the bit lines and includes the same material as the cell buried insulation pattern, and residual spacer patterns fill recess regions to prevent malfunctions and enhance reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If highly integrated semiconductor memory devices with miniaturized patterns are manufactured, then device integration and functionality are improved, but novel and expensive exposure techniques are required
Solution Approach 1:
The patent divides the semiconductor device into distinct regions (cell array region and boundary region) with different structural configurations. The boundary region contains bit lines extending outside the cell array region, while the cell array region has conventional structures, allowing different manufacturing approaches for different functional areas.
Solution Approach 2:
The patent applies different structural designs to different locations: the boundary region has bit lines extending outward with associated insulation patterns, while the cell array region maintains conventional compact structures. This local differentiation optimizes each region for its specific function without requiring expensive exposure techniques across the entire device.
2Adaptability or versatility
If bit lines extend outside the cell array region to the boundary region, then device functionality is improved, but spaces between bit lines must be buried to prevent malfunction
Solution Approach 1:
The patent proactively addresses potential malfunction by burying spaces between bit lines in the boundary region with insulation patterns before any electrical connections are established. The cell buried insulation pattern and boundary buried insulation pattern are formed in advance to prevent harmful factors such as short circuits or electrical interference.
Solution Approach 2:
The patent introduces insulation patterns as intermediary structures between the bit lines and surrounding environment. These boundary buried insulation patterns act as mediators that electrically isolate the bit lines extending into the boundary region, preventing unwanted electrical interactions while maintaining signal integrity.
3Ease of manufacture
If cell buried insulation patterns are formed in the cell array region, then manufacturing process is simplified, but boundary region requires additional boundary buried insulation patterns
Solution Approach 1:
The patent merges the cell buried insulation pattern formation and boundary buried insulation pattern formation into a unified manufacturing process. Both insulation patterns are formed using similar materials and processes, but the boundary buried insulation patterns are additionally formed in the boundary region to address the extended bit line structures.
Solution Approach 2:
The patent uses the same insulation material and formation process for both cell buried insulation patterns and boundary buried insulation patterns. This universal approach allows a single manufacturing process to serve dual functions: insulating bit lines in the cell array region and insulating extended bit lines in the boundary region.
Data Source
AI summary
A semiconductor memory device including: a substrate including a cell array region and a boundary region; a first recess region at an upper portion of the substrate in the cell array region; a first bit line extending onto the boundary region and crossing the first recess region; a bit line contact in the first recess region and contacting the first bit line; a second bit line spaced apart from the first recess region and adjacent to the first bit line, the second bit line crossing the cell array region and the boundary region; a cell buried insulation pattern between a side surface of the first bit line contact and an inner wall of the first recess region; and a boundary buried insulation pattern covering sidewalls of the first bit line and the second bit line in the boundary region and including a same material as the cell buried insulation pattern.