Microelectronic Isolation Structure with Lower-Bandgap Dielectric
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Solution Overview
Problem
High voltage microelectronic devices face reliability degradation due to the lower-bandgap dielectric layer, which supports mechanisms that limit overall reliability, particularly at high operating voltages.
Innovation Solution
A lower-bandgap dielectric layer with a sub-layer structure is used between the high voltage node and the main dielectric, extending continuously around the high voltage node, and an isolation break is introduced to prevent leakage current, ensuring the layer does not contact low voltage elements, thereby enhancing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If the lower-bandgap dielectric layer extends continuously around the high voltage node to reduce electric field peaks, then electric field distribution is improved, but leakage current paths are created that degrade reliability
Solution Approach 1:
The continuous lower-bandgap dielectric layer is segmented vertically into sub-layers with different electrical properties. This segmentation disrupts continuous leakage current paths while maintaining the lateral extension needed for electric field management at the high voltage node corners.
Solution Approach 2:
The second sub-layer with higher bandgap energy is positioned to specifically address leakage current issues, while the first sub-layer maintains electric field reduction functionality. This local quality differentiation allows simultaneous optimization of both electric field distribution and leakage current prevention.
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 solution effectively reduces electric field peaks at the high voltage node corners and prevents leakage current, significantly improving the reliability of high voltage microelectronic devices, especially those operating at 1000 volts or higher.
Implementation Method 1
provides reliability for the main dielectric by reducing peak electric fields at corners of the high voltage node
Implementation Method 2
The lower-bandgap dielectric layer has an isolation break surrounding the high voltage node at a distance of at least twice the thickness of the lower-bandgap dielectric layer from the high voltage node
Data Source
AI summary
A microelectronic device contains a high voltage component having a high voltage node and a low voltage node. The high voltage node is isolated from the low voltage node by a main dielectric between the high voltage node and low voltage elements at a surface of the substrate of the microelectronic device. A lower-bandgap dielectric layer is disposed between the high voltage node and the main dielectric. The lower-bandgap dielectric layer contains at least one sub-layer with a bandgap energy less than a bandgap energy of the main dielectric. The lower-bandgap dielectric layer extends beyond the high voltage node continuously around the high voltage node. The lower-bandgap dielectric layer has an isolation break surrounding the high voltage node at a distance of at least twice the thickness of the lower-bandgap dielectric layer from the high voltage node.