Air-Gap ILD Structure for Lower Capacitance Semiconductor Interconnects
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Solution Overview
Problem
The increasing complexity of manufacturing semiconductor integrated circuits (ICs) due to scaling down processes poses challenges in maintaining production efficiency and reducing costs while ensuring effective device performance.
Innovation Solution
The semiconductor device incorporates a dielectric structure with a leakage-improving component, such as an air gap, to reduce capacitance and improve RC delay issues, alongside a conductive layer and gate structure on a substrate, facilitating efficient manufacturing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If scaling down process is used to increase functional density, then production efficiency and cost are improved, but manufacturing complexity increases
Solution Approach 1:
The patent introduces a mandrel-based segmentation approach where a sacrificial mandrel structure is used to divide and organize multiple trench formations. This allows systematic creation of complex 3D structures (vertical trenches, lateral trenches, isolation trenches) through sequential processing steps, making the manufacturing of high-density circuits more manageable and less error-prone despite the increased complexity from scaling down.
2Ease of manufacture
If conventional dielectric structure is used, then manufacturing is simple, but leakage and capacitance increase causing RC delay issues
Solution Approach 1:
The patent implements an air gap dielectric structure created by removing the sacrificial mandrel after trench formations are complete. This porous/void-based dielectric (the air gap surrounded by conductive material) provides superior electrical isolation and reduced capacitance compared to conventional solid dielectric materials, thereby improving RC delay performance and reducing leakage while maintaining manufacturability through the structured mandrel process.
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 implementation of the dielectric structure with a leakage-improving component enhances the semiconductor device's performance by reducing leakage and capacitance, thereby improving manufacturing efficiency and device reliability.
Implementation Method 1
The semiconductor device incorporates a dielectric structure with a leakage-improving component, such as an air gap, to reduce capacitance and improve RC delay issues
Data Source
AI summary
A semiconductor device and method of manufacturing the same are provided. The semiconductor device includes a substrate, an interlayer dielectric (ILD), and a conductive layer. The ILD is disposed on the substrate. The conductive layer is disposed on the substrate and spaced apart from the ILD by an air gap. The ILD is tapered toward the substrate.