Air-Gap Contact Isolation Structure for Lower Parasitic Capacitance
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Solution Overview
Problem
The manufacturing and integration of semiconductor devices are complex and prone to deficiencies, necessitating improvements in the manufacturing process to address these challenges.
Innovation Solution
A semiconductor device is designed with a bottom barrier layer, a conductive contact, and a top barrier layer forming an I-shaped structure, accompanied by an isolation layer that includes vanadium, which helps form an air gap during deposition, reducing parasitic capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional manufacturing processes are used for semiconductor devices, then the manufacturing complexity is high and integration is complicated, but the parasitic capacitance between conductive contacts increases
Solution Approach 1:
The isolation layer is segmented into multiple portions (first isolation layer portion, second isolation layer portion, third isolation layer portion) with different materials and depths. This segmentation allows each portion to serve specific functions: the first portion provides electrical isolation, the second portion forms air gaps to reduce parasitic capacitance, and the third portion provides mechanical support. By dividing the isolation structure into functional segments, the patent reduces parasitic capacitance while maintaining manufacturability through standardized processing steps.
Solution Approach 2:
Different regions of the isolation layer are assigned different material compositions and physical properties. The first isolation layer portion uses a material with specific dielectric properties for electrical isolation, the second portion creates air gaps with vacuum properties for capacitance reduction, and the third portion uses a different material for structural stability. This local differentiation of quality allows the structure to optimize for capacitance reduction in critical areas while maintaining overall manufacturing feasibility.
2Object-affected harmful factors
If the isolation layer is made thicker to reduce parasitic capacitance, then the capacitance decreases, but the manufacturing precision requirements increase
Solution Approach 1:
The thick isolation layer is divided into multiple segments of different thicknesses and materials. The first portion extends to a first depth, the second portion creates air gaps at an intermediate depth, and the third portion extends to a second depth greater than the first. This segmentation allows the structure to achieve effective capacitance reduction through multiple mechanisms acting in series, while each individual layer can be manufactured with standard precision tolerances rather than requiring one extremely precise thick layer.
Solution Approach 2:
The patent changes material parameters across different isolation layer portions. The first portion uses a dielectric material with specific permittivity, the second portion introduces air gaps (effectively changing the dielectric constant to接近1), and the third portion uses a different material composition. By changing material parameters rather than simply increasing thickness, the patent achieves capacitance reduction while maintaining manufacturable dimension tolerances for each layer.
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 I-shaped structure and vanadium-containing isolation layer effectively reduce parasitic capacitance between conductive contacts, enhancing overall device performance.
Implementation Method 1
an isolation layer disposed adjacent to the I-shaped structure and extending into the semiconductor substrate. An air gap is surrounded by the isolation layer
Data Source
AI summary
A semiconductor device includes a bottom barrier layer disposed over a semiconductor substrate, and a conductive contact disposed over the bottom barrier layer. The semiconductor device also includes a top barrier layer disposed over the conductive contact. The bottom barrier layer, the conductive contact, and the top barrier layer form an I-shaped structure. The semiconductor device further includes an isolation layer disposed adjacent to the I-shaped structure and extending into the semiconductor substrate. An air gap is surrounded by the isolation layer.