Semiconductor Reinforcing Elements for Electrode Integration
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Solution Overview
Problem
Conventional semiconductor manufacturing processes face issues with electrode peeling and breakdown due to small interface areas and narrow separation trenches, leading to reduced yield and reliability, especially under high voltage operations.
Innovation Solution
The method involves forming reinforcing elements on the sidewalls and surfaces of separation trenches and upper electrodes, using dielectric materials like silicon oxide, silicon nitride, or benzocyclobutene to strengthen the integration and isolation of the electrodes and insulation layers, preventing etching fluid intrusion and electrode peeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the interface area between the insulation layer and upper electrodes is reduced, then the device size is minimized, but electrode peeling occurs reducing yield
Solution Approach 1:
The patent divides the structure into multiple segments by introducing separation trenches between upper electrodes and forming recesses at the interface between the insulation layer and upper electrodes. This segmentation allows for better stress distribution and prevents peeling while maintaining compact device size.
Solution Approach 2:
The patent transitions from a two-dimensional interface problem to a three-dimensional solution by forming recesses that extend vertically into the insulation layer and by creating separation trenches. This dimensional change increases the effective bonding area without significantly increasing the horizontal device footprint.
2Length of moving object
If the separation trenches between upper electrodes are made narrower to reduce device size, then the device footprint is minimized, but electrode breakdown occurs under high voltage
Solution Approach 1:
The patent compensates for narrow trench width by introducing vertical depth through recesses. The recesses extend downward into the insulation layer, providing additional electrical isolation and mechanical support that prevents breakdown even when the horizontal separation distance is minimized.
Solution Approach 2:
The patent employs composite structural elements combining the device layer, insulation layer, and recess features to create a multi-layered isolation system. This composite approach provides enhanced electrical breakdown resistance without requiring proportionally larger separation distances.
3Manufacturing precision
If etching fluids are used to form separation trenches and recesses, then the structure is precisely defined, but etching fluids seep into the device causing defects
Solution Approach 1:
The patent performs preliminary protective actions by forming the device layer structure and insulation layer with built-in geometric features (recesses and trenches) that inherently prevent fluid seepage paths. The recesses are formed to create overhangs or barriers that block etching fluid from penetrating deep into the device structure.
Solution Approach 2:
The recesses and separation trenches act as intermediary structures that manage the interaction between etching fluids and the device. These features control fluid flow paths, preventing direct contact with sensitive internal structures while still allowing precise pattern definition during fabrication.
Data Source
AI summary
The present disclosure provides a method for fabricating semiconductor devices having reinforcing elements. The method includes steps of providing a first wafer having a lower electrode layer and an insulation layer; forming a device layer; etching the device layer and the insulation layer to form recesses; etching the device layer to form separation trenches and upper electrodes; forming reinforcing elements; and depositing metal pads. The reinforcing elements strengthen the integration of the upper electrodes and the insulation layer.