MIM Capacitor Edge-Shield Electrode for Breakdown Suppression
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Solution Overview
Problem
MIM capacitors tend to break down near the outer periphery of the upper electrode during current-carrying tests due to electric field concentration and poor adhesion between the upper electrode and the insulating film.
Innovation Solution
Incorporating an additional electrode within an insulating film above the outer periphery of the upper electrode, which is connected to the upper electrode and extends beyond its outer perimeter to shield the electric field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the MIM capacitor structure is used with standard electrode configuration, then the capacitor achieves basic functionality, but electric field concentration occurs at the outer periphery of the upper electrode causing breakdown during current-carrying tests
Solution Approach 1:
An additional electrode is introduced as an intermediary element between the upper electrode and the insulating film. This additional electrode extends beyond the outer periphery of the upper electrode and is connected to it, serving as a mediator to redistribute and shield the electric field lines, preventing direct concentration at the upper electrode's edge where breakdown occurs.
Solution Approach 2:
The solution extends the electrode structure into a new spatial dimension by adding the additional electrode that protrudes laterally beyond the upper electrode's perimeter. This dimensional extension creates an expanded electric field distribution pattern that prevents concentration at the original boundary, effectively moving the field interaction to a different spatial configuration.
2Reliability
If the upper electrode is directly connected to the insulating film, then the structure remains simple, but adhesion between the upper electrode and insulating film is poor leading to breakdown
Solution Approach 1:
The additional electrode serves as an intermediary layer between the upper electrode and the insulating film. This intermediate structure improves the adhesion interface by providing a larger contact area and better mechanical anchoring, while also serving the electrical function of field shielding. The additional electrode acts as a buffer zone that enhances the bond between the rigid upper electrode and the insulating film.
Solution Approach 2:
The additional electrode is formed as part of the upper electrode structure before final assembly, creating a pre-established adhesion interface. This preliminary structural arrangement ensures that the adhesion-enhancing geometry is built-in from the manufacturing stage, preventing future delamination or breakdown at the electrode-insulating film interface.
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 additional electrode effectively reduces electric field concentration at the outer periphery of the upper electrode, thereby suppressing capacitor breakdown during energization tests and extending the capacitor's lifespan.
Implementation Method 1
an additional electrode that is disposed in the insulating film and above an outer periphery of the upper electrode, has an outer periphery located outside the outer periphery of the upper electrode, and is connected to the upper electrode
Data Source
AI summary
A capacitor includes an MIM capacitor that includes a lower electrode, a dielectric film disposed on the lower electrode, and an upper electrode disposed on the dielectric film, an insulating film that is disposed on the upper electrode so as to cover the MIM capacitor, and an additional electrode that is disposed in the insulating film and above an outer periphery of the upper electrode, has an outer periphery located outside the outer periphery of the upper electrode, and is connected to the upper electrode.