Vertical Channel Memory Cell Layout for Word Line Interference
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Solution Overview
Problem
Current semiconductor devices face challenges in increasing integration density and improving electrical characteristics, particularly in reducing electric interference between word lines and enhancing current driving characteristics.
Innovation Solution
The semiconductor device incorporates a protection pattern that defines an air gap between word lines, which reduces electric interference and increases integration density by interposing the word line between gate insulating patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If word lines are placed close together to increase integration density, then integration density is improved, but electric interference between word lines increases
Solution Approach 1:
A protection pattern is introduced as an intermediary structure between adjacent word lines. This protection pattern acts as a mediator that blocks or reduces the electric interference (coupling) between word lines while allowing the word lines to maintain close spacing for high integration density. The protection pattern is formed between the word lines in the vertical channel transistor structure, creating a shielding effect that mitigates the harmful electric field interaction.
2Quantity of substance
If vertical channel transistors are used to increase integration density, then integration density is improved, but fabrication complexity increases
Solution Approach 1:
The gate structure is segmented into multiple gate insulating patterns formed on different active pillars (first gate insulating pattern on first active pillar, second gate insulating pattern on second active pillar). This segmentation allows the fabrication process to be broken down into manageable steps, where each gate insulating pattern can be formed and positioned independently, reducing the overall fabrication complexity while achieving the vertical channel transistor configuration for high integration density.
3Reliability
If protection pattern is added between word lines to reduce electric interference, then electrical characteristics are improved, but device structure becomes more complex
Solution Approach 1:
The protection pattern is merged with the existing word line structure and active pillar configuration. Rather than adding a completely separate complex structure, the protection pattern is integrated into the vertical channel transistor architecture, forming a unified structure where the protection pattern, word lines, and active pillars work together. This merging approach improves electrical characteristics by reducing interference while minimizing the increase in device structural complexity.
Data Source
AI summary
A semiconductor device may include a first bit line that extends in a first direction, a first active pillar and a second active pillar on the first bit line, a first gate insulating pattern enclosing the first active pillar, a second gate insulating pattern on the second active pillar, a first word line and a second word line that extends in a second direction that intersects the first direction, and a protection pattern between the first and second word lines. An air gap is between the first and second word lines and may be adjacent to the protection pattern.