T-Shaped Air Spacer for Semiconductor Parasitic Capacitance
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Solution Overview
Problem
As semiconductor devices become more integrated, parasitic capacitance and leakage current increase, degrading performance due to the miniaturization of separate circuit patterns, which existing technologies have not effectively addressed.
Innovation Solution
A semiconductor device is designed with an air spacer structure that includes a first portion between two spacers within a trench and a second portion extending on the spacers, where the width of the second portion is greater than the first portion, reducing parasitic capacitance by forming a T-character shape in cross-section, facilitating efficient etching and providing additional space to minimize capacitance between conductive patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If separate circuit patterns are miniaturized to increase integration, then device density increases, but parasitic capacitance and leakage current increase degrading performance
Solution Approach 1:
The patent applies local quality by creating a T-shaped air spacer structure with different width portions. The first width portion has a smaller width adjacent to the conductive pattern, while the second width portion has a larger width extending outward. This non-uniform local structure optimizes the balance between minimizing parasitic capacitance near the conductive pattern and providing sufficient spacing for signal isolation, thereby reducing harmful electromagnetic interference while maintaining high device density.
Solution Approach 2:
The air spacer acts as an intermediary structure between adjacent conductive patterns. The T-shaped configuration with its two width portions provides a graduated transition zone that mediates the electromagnetic field interaction between neighboring circuits. The first width portion provides immediate capacitance reduction near the conductive pattern, while the second width portion extends the isolation effect, effectively mediating parasitic capacitance and leakage current issues.
2Productivity
If separate circuit patterns are miniaturized to increase integration, then device density increases, but leakage current increases degrading performance
Solution Approach 1:
The T-shaped air spacer structure implements local quality by varying the spacer width at different locations. The first width portion with smaller dimension is positioned where leakage current pathways are most critical, providing focused isolation. The second width portion with larger dimension extends the isolation zone, creating a graduated barrier against leakage current while maintaining compact overall dimensions for high device density.
Solution Approach 2:
The air spacer serves as an intermediary isolation structure between miniaturized circuit patterns. The T-shaped configuration with its dual width portions creates a stepped isolation barrier that effectively mediates leakage current pathways. The structure provides progressive electrical isolation, with the first width portion addressing immediate leakage risks and the second width portion extending protection, thereby enabling high-density integration without excessive leakage.
3Object-generated harmful factors
If air spacer width is increased to reduce parasitic capacitance, then capacitance decreases, but device area increases reducing integration
Solution Approach 1:
The air spacer is segmented into two distinct width portions: a first width portion with smaller dimension adjacent to the conductive pattern, and a second width portion with larger dimension extending outward. This segmentation allows the structure to perform multiple functions within a compact area - the first portion minimizes parasitic capacitance with minimal space, while the second portion provides extended isolation without proportionally increasing the overall device footprint, thus resolving the contradiction between capacitance reduction and area minimization.
Solution Approach 2:
The T-shaped air spacer applies local quality by concentrating the capacitance-reducing function in the first width portion near the conductive pattern, while the second width portion provides additional isolation benefit with minimal area penalty. This non-uniform local structure optimizes the capacitance-area tradeoff by placing spacer material where it is most effective rather than uniformly increasing dimensions.
Data Source
AI summary
A semiconductor device is provided including a substrate including a trench. A first conductive pattern is disposed within the trench. The first conductive pattern has a width smaller than a width of the trench. A first spacer extends along at least a portion of a side surface of the first conductive pattern and the trench. A second spacer at least partially fills the trench adjacent to the first spacer. An air spacer is provided including a first portion between the first spacer and the second spacer, and a second portion disposed on the second spacer and the first portion. A width of the second portion of the air spacer is greater than a width of the first portion of the air spacer.