Semiconductor Wiring Layout With Air Gap Isolation Margin
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Solution Overview
Problem
The increasing integration of semiconductor elements leads to reduced reliability, necessitating improved isolation margins between wiring patterns to enhance device performance.
Innovation Solution
A semiconductor device design featuring a wiring pattern on a contact plug with an etched upper part, surrounded by an air gap and interlayer insulating layers, ensuring an isolation margin with adjacent patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If semiconductor elements are highly integrated to increase operating speed and reduce power consumption, then device performance is improved, but reliability deteriorates due to reduced isolation margins
Solution Approach 1:
The patent introduces air gaps in the vertical dimension between adjacent wiring patterns, transitioning from two-dimensional planar isolation to three-dimensional spatial isolation. This vertical separation provides additional isolation margin without increasing lateral spacing, enabling continued miniaturization while maintaining reliability.
Solution Approach 2:
The air gap acts as an intermediary structure between adjacent wiring patterns and contact plugs. This intermediate space provides electrical isolation and mechanical stress relief, preventing harmful interactions between neighboring structures while allowing the wiring patterns to be placed closer together.
2Productivity
If wiring patterns are placed closer together to increase integration density, then productivity is improved, but manufacturing precision requirements increase due to reduced isolation margins
Solution Approach 1:
By utilizing the vertical dimension through air gap formation, the patent achieves isolation without requiring increased lateral spacing. This allows wiring patterns to be placed closer together horizontally while maintaining sufficient isolation margins through the vertically extended air gap structure.
Solution Approach 2:
The air gap is formed as a temporary structural feature during manufacturing that provides isolation during critical processes. The gap structure itself does not require complex materials or additional processing steps, serving as a simple yet effective isolation mechanism that enables higher integration density.
Data Source
AI summary
A semiconductor device includes a substrate, a first interlayer insulating layer disposed on the substrate, a first trench formed inside the first interlayer insulating layer, a contact plug disposed inside the first trench, a first wiring pattern disposed on the contact plug, a second wiring pattern which is disposed on the first interlayer insulating layer and spaced apart from the first wiring pattern in a horizontal direction, a second interlayer insulating layer which is disposed on the first interlayer insulating layer and surrounds each of side walls of the first wiring pattern and each of side walls of the second wiring pattern, and a first air gap formed on the contact plug inside the first trench.