Air-Lined Through-Substrate Via Structure for Lower Parasitic Capacitance
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Solution Overview
Problem
Conventional semiconductor fabrication methods lead to excessive parasitic capacitance in 3DICs due to the thinness of the die, which affects thermal dissipation and device performance.
Innovation Solution
The introduction of air liners as a novel through-substrate via (TSV) liner to reduce parasitic capacitance by replacing dielectric materials with air, which has a lower dielectric constant, thereby improving thermal dissipation and device speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dielectric materials are used as TSV liners, then the structure provides mechanical support and electrical isolation, but parasitic capacitance increases due to the dielectric constant of the material
Solution Approach 1:
The patent removes the dielectric liner material from the TSV structure, extracting the harmful dielectric constant while maintaining the structural integrity through alternative means. The air gap created by removing the dielectric material eliminates parasitic capacitance while the copper TSV and surrounding dielectric structure provide the necessary mechanical support and electrical isolation.
Solution Approach 2:
The patent introduces air (an inert environment with near-zero dielectric constant) into the TSV liner position. This inert atmospheric filling replaces the harmful dielectric material, providing electrical isolation without introducing significant parasitic capacitance, as air has a dielectric constant of approximately 1.0.
2Ease of manufacture
If conventional dielectric liners are used in TSVs, then manufacturing processes are simplified, but thermal dissipation is hindered due to the insulating properties of dielectric materials
Solution Approach 1:
The patent extracts the thermal barrier created by dielectric liner materials by removing them entirely from the TSV structure. This extraction eliminates the thermal insulation effect, allowing heat to dissipate more efficiently through the copper TSV and surrounding structures, while the fabrication process remains simplified through standard air gap formation techniques.
3Reliability
If thicker dielectric liners are deposited to improve electrical isolation, then reliability increases, but parasitic capacitance and device complexity increase
Solution Approach 1:
The patent extracts the need for thick dielectric liners by removing the dielectric material entirely and replacing it with air. This extraction achieves electrical isolation with minimal structure, as the air gap provides sufficient insulation without the complexity and space requirements of thick dielectric layers, thereby reducing device complexity while maintaining reliability.
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
The use of air liners effectively decreases parasitic capacitance, enhancing the performance of 3DICs by reducing the overall dielectric constant and allowing for tunable capacitance configurations, thus improving thermal dissipation and increasing device speed.
Implementation Method 1
replacing dielectric materials with air, which has a lower dielectric constant, thereby improving thermal dissipation and device speed
Implementation Method 2
improving thermal dissipation and device speed
Data Source
AI summary
A first conductive pad disposed over a first side of a substrate in a first direction. A second conductive pad is disposed over a second side of the substrate in the first direction. A through-substrate via (TSV) extends into the substrate in the first direction. The TSV is disposed between the first conductive pad and the second conductive pad in the first direction. An air liner disposed between the TSV and the substrate in a second direction different from the first direction.