High-k Dielectric Interface Layout for Isolator Breakdown Control
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Solution Overview
Problem
Existing isolators face challenges in preventing dielectric breakdown due to high electric field intensities at the lower end vicinity of the second electrode, leading to potential breakdown and signal transmission failures.
Innovation Solution
The isolator design incorporates a first dielectric portion with a higher relative dielectric constant than the insulating portions, positioned around the second electrode along the X-Y plane, reducing the electric field intensity by optimizing the distance and angle of the dielectric interfaces, and using materials like silicon nitride to enhance mechanical strength and reduce leakage current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional isolator structure is used, then signal transmission is achieved, but high electric field intensity at the lower end vicinity of the second electrode causes dielectric breakdown
Solution Approach 1:
The patent applies local quality by introducing a first dielectric portion with high relative dielectric constant specifically at the lower end vicinity of the second electrode where electric field intensity is highest. This localized modification targets the critical breakdown region without changing the entire isolator structure, optimizing dielectric strength precisely where needed to prevent breakdown while maintaining signal transmission functionality.
Solution Approach 2:
The patent changes the dielectric parameter (relative dielectric constant) by selecting a first dielectric portion with higher relative dielectric constant than the first and second insulating portions. This parameter change increases the dielectric strength in the critical region, reducing electric field intensity and preventing breakdown while maintaining the isolator's signal transmission capability.
2Object-affected harmful factors
If the distance between the lower end of the second electrode and the first interface is reduced, then electric field intensity is reduced, but the structure becomes more compact with less design flexibility
Solution Approach 1:
The patent addresses the structural constraint by extending the first dielectric portion not only in the vertical direction (first direction) but also in the horizontal direction (second direction) around the second electrode. This dimensional extension allows the dielectric portion to effectively reduce electric field intensity at the lower end vicinity while providing design flexibility through varied configurations in multiple dimensions.
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 configuration effectively reduces the maximum electric field intensity at the lower end vicinity, minimizing the likelihood of dielectric breakdown and enhancing the reliability of signal transmission while maintaining low electrical resistivity.
Implementation Method 1
a first dielectric portion (31) provided between the first insulating portion (21) and the second insulating portion (22) in the first direction. At least a portion of the first dielectric portion (31) contacts the second electrode (12) and is positioned around the second electrode (12) along the first plane
Data Source
AI summary
According to one embodiment, an isolator includes first and second electrodes, first and second insulating portions, and a first dielectric portion. The first insulating portion is provided on the first electrode. The second electrode is provided on the first insulating portion. The second insulating portion is provided around the second electrode along a first plane perpendicular to a first direction. The second insulating portion contacts the second electrode. The first dielectric portion is provided between the first and second insulating portions. At least a portion of the first dielectric portion contacts the second electrode and is positioned around the second electrode along the first plane. A distance between a lower end of the second electrode and a first interface between the first dielectric portion and the second insulating portion is less than a distance between the first interface and an upper end of the second electrode.