Semiconductor Electrode Overlap Air Gaps for Reduced Signal Delay
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Solution Overview
Problem
The miniaturization and integration of semiconductor structures are hindered by stray capacitance between adjacent metal layers, which leads to signal delay due to the reduced vertical distance between metal layers, and increasing the distance between layers to reduce capacitance values is not conducive to these goals.
Innovation Solution
Incorporating an air gap within the dielectric layer in the overlapping area of adjacent electrode layers, where the dielectric constant of the air gap is less than that of the dielectric layer, thereby reducing stray capacitance and signal delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the vertical distance between adjacent metal layers is reduced to achieve miniaturization and integration, then the semiconductor structure becomes more compact and integrated, but stray capacitance increases causing signal delay
Solution Approach 1:
The patent introduces air gaps specifically in the overlapping areas of adjacent metal layers, creating local regions with different dielectric properties. The air gap material (dielectric constant ≈1) replaces the original dielectric material in specific locations, reducing the local dielectric constant and thereby reducing stray capacitance in the overlapping regions without increasing the overall vertical distance between metal layers.
Solution Approach 2:
The patent creates a composite dielectric structure by combining the original dielectric material with air gaps in the overlapping areas. This composite structure has an effective dielectric constant lower than the original uniform dielectric material, reducing stray capacitance while maintaining the compact vertical spacing between metal layers.
2Object-generated harmful factors
If the distance between adjacent metal layers is increased to reduce stray capacitance, then signal delay is reduced, but the dimension (such as thickness) of the semiconductor structure increases
Solution Approach 1:
Instead of uniformly increasing the distance between all metal layers, the patent applies air gaps locally only in the overlapping areas where stray capacitance is generated. This targeted approach reduces capacitance without increasing the overall thickness of the semiconductor structure, as non-overlapping regions maintain their original compact spacing.
Solution Approach 2:
The dielectric layer is segmented into regions with and without air gaps. The air gaps are introduced only in the overlapping areas of adjacent metal layers, creating a segmented dielectric structure that reduces capacitance where needed while maintaining compact dimensions in non-overlapping regions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively reduces signal delay and improves the performance of semiconductor structures by minimizing capacitance values while maintaining the compactness and integration of the semiconductor structure.
Implementation Method 1
the dielectric constant of the air gap is less than that of the dielectric layer, thereby reducing stray capacitance
Data Source
AI summary
A semiconductor structure and a method for manufacturing a semiconductor structure are provided. The semiconductor structure includes at least two electrode layers, and the electrode layers are parallel to each other and arranged in different layers. Adjacent electrode layers overlap with each other and have an overlapping area, a dielectric layer is arranged between the adjacent electrode layers, and an air gap is arranged in the dielectric layer located in the overlapping area.