Thin Film Capacitor Protective Layer Modulus Control
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Solution Overview
Problem
Conventional protective layers in thin film capacitors fail to maintain stable electrical connection performance over time due to deformation caused by the electrostrictive effect of the dielectric layer, leading to a decline in terminal electrode connectivity with the electrode layers.
Innovation Solution
A thin film capacitor design featuring a protective layer with a Young's modulus between 0.1 GPa and 2.0 GPa, combined with an insulating layer of higher Young's modulus, ensures mechanical connection strength and stability of terminal electrodes, preventing deformation from spreading to the terminal electrodes and maintaining electrical contact with external circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional protective layer is used, then the terminal electrode can be held, but the deformation from the electrostrictive effect spreads to the terminal electrode, causing electrical connection performance to decline over time
Solution Approach 1:
The patent applies parameter changes by precisely controlling the Young's modulus of the protective layer within the range of 0.1 to 2.0 GPa. This parameter optimization allows the protective layer to absorb deformation from the electrostrictive effect while maintaining mechanical strength, thereby preventing deformation spread to the terminal electrode and ensuring stable electrical connection performance over time.
Solution Approach 2:
The patent employs composite material structure by combining the protective layer with specific mechanical properties (Young's modulus: 0.1-2.0 GPa) with the capacitor element and terminal electrode assembly. This composite configuration enables the protective layer to function as a deformation buffer while maintaining structural integrity and electrical connection stability.
2Strength
If the Young's modulus of the protective layer is increased above 2.0 GPa, then the protective layer becomes more rigid, but deformation is not absorbed and spreads to the terminal electrode, reducing mechanical connection strength
Solution Approach 1:
The patent resolves this contradiction by optimizing the Young's modulus parameter within the specific range of 0.1 to 2.0 GPa. This parameter setting balances the competing requirements: the protective layer remains rigid enough to maintain mechanical connection strength while being compliant enough to absorb deformation from the electrostrictive effect, preventing deformation spread to the terminal electrode.
3Stability of the object's composition
If the Young's modulus of the protective layer is decreased below 0.1 GPa, then the protective layer becomes more flexible, but fixation of the terminal electrode becomes unstable, reducing mechanical connection strength
Solution Approach 1:
The patent resolves this contradiction by establishing the lower bound of the Young's modulus range at 0.1 GPa. This parameter threshold ensures the protective layer maintains sufficient rigidity for stable terminal electrode fixation and mechanical connection, while still being compliant enough to absorb deformation effectively. The optimized parameter balance prevents both deformation spread and fixation instability.
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 proposed configuration effectively stabilizes electrical connections between the terminal electrodes and external circuits, enhancing the reliability and durability of thin film capacitors by absorbing deformation and maintaining mechanical connection strength.
Implementation Method 1
the capacitor element is deformed based on an electrostrictive effect of a dielectric layer
Implementation Method 2
a modulus of longitudinal elasticity (generally called 'Young's modulus'; simply called 'Young's modulus' hereinafter) of the protective layer is equal to or higher than 0.1 GPa and equal to or lower than 2.0 GPa
Data Source
AI summary
A thin film capacitor comprises: a laminated body that has a base electrode, a dielectric layer and an upper electrode layer; a protective layer covering the base electrode, the dielectric layer and the upper electrode layer, and includes a first through-hole that reaches the base electrode, and a second through-hole that reaches the upper electrode layer; a first extraction electrode in the first through-hole and electrically connected with the base electrode; a second extraction electrode in the second through-hole and electrically connected with the upper electrode layer; a first terminal electrode on the protective layer, and connected with the base electrode through the first extraction electrode; and a second terminal electrode on the protective layer, and connected with the upper electrode layer through the second extraction electrode. Young's modulus of the protective layer is equal to or higher than 0.1 GPa and equal to or lower than 2.0 GPa.