Barium Zirconium Titanate Thin Film for High-Capacity MLCC Reliability
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Solution Overview
Problem
High-capacity multilayered capacitors face challenges in maintaining moisture resistance reliability and mechanical strength due to reduced margin ratios, which compromise their performance.
Innovation Solution
A multilayered capacitor design featuring a dense thin film made of barium zirconium titanate on its surface to inhibit moisture and hydrogen penetration, along with an oxide layer, which increases the active region volume fraction while decreasing the non-contributing region, thereby enhancing moisture resistance and mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the margin ratio is reduced to increase capacity, then the volume fraction of active region increases, but moisture resistance reliability and mechanical strength deteriorate
Solution Approach 1:
A thin film coating layer is formed on the surface of the capacitor body to act as a protective barrier. This thin film prevents moisture and impurities from penetrating into the capacitor, thereby maintaining moisture resistance reliability even when the margin ratio is reduced and capacity is increased.
Solution Approach 2:
The surface treatment layer is formed using a composite material system consisting of multiple oxides (such as BaO, ZrO2, TiO2, Nb2O5, Ta2O5, WO3, MoO3, Bi2O3, PbO, SiO2, B2O3, Al2O3, ZnO, In2O3, Ga2O3, SnO2, HfO2, Dy2O3, Nd2O3, Gd2O3, and Lu2O3). This composite material provides both protective functionality and compatibility with the capacitor body.
2Quantity of substance
If the margin ratio is reduced to increase capacity, then the volume fraction of active region increases, but mechanical strength deteriorates
Solution Approach 1:
The thin film coating layer not only protects against moisture but also reinforces the surface structure of the capacitor body. This protective layer prevents mechanical strength degradation that would otherwise occur when the margin ratio is reduced.
Solution Approach 2:
The multi-oxide composite material system provides enhanced mechanical properties to the surface treatment layer, ensuring that mechanical strength is maintained even when the capacitor design optimizes for higher capacity through reduced margin ratios.
3Reliability
If a surface treatment layer is added to improve moisture resistance, then moisture resistance reliability improves, but device complexity increases
Solution Approach 1:
A single thin film coating layer is applied to the capacitor body surface. This simple yet effective approach provides moisture protection without requiring complex multi-layer structures or additional components.
Solution Approach 2:
The surface treatment is achieved by controlling the composition ratios of multiple oxides within the coating layer. By adjusting parameters such as the molar ratios of BaO, ZrO2, TiO2, and other oxides, optimal moisture resistance is achieved while maintaining a relatively simple single-layer structure.
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 improves moisture resistance reliability and prevents mechanical strength degradation while maintaining high capacity by optimizing the volume fractions of active and non-active regions.
Implementation Method 1
a dense thin film is disposed on the surface of the capacitor body to inhibit the formation of penetration paths for moisture, water vapor, and hydrogen
Implementation Method 2
an oxide layer between the capacitor body and the thin film
Data Source
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AI summary
A multilayered capacitor that includes a capacitor body including a dielectric layer and an internal electrode, an external electrode disposed outside the capacitor body, and a thin film disposed on a surface of the capacitor body and including barium zirconium titanate. The barium zirconium titanate includes zirconium in an amount of about 10 parts by mole to about 50 parts by mole based on about 100 parts by mole of titanium.