MLCC Dielectric Layer with Metallic Particles and Protective Layers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Multilayer ceramic capacitors face a challenge in achieving both miniaturization and high capacitance without degrading reliability, as increasing the number of stacked layers or electrode area is limited, and existing methods to enhance dielectric constant, such as distributing metallic particles in BaTiO3, compromise reliability.
Innovation Solution
A capacitor component design featuring a dielectric layer with a composite layer including a first dielectric material and metallic particles, surrounded by protective layers, where the thickness of the protective layers is equal to or greater than one-third of the dielectric layer, to increase dielectric constant while maintaining reliability by forming a space charge layer and preventing shorts between internal electrodes and metallic particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If metallic particles are distributed in BaTiO3 to increase dielectric constant, then dielectric constant is improved, but reliability deteriorates
Solution Approach 1:
The patent applies local quality by creating distinct regions with different functions: the composite layer contains metallic particles for high dielectric constant, while the protective layers are free of metallic particles for reliability. This spatial differentiation of material composition resolves the contradiction by localizing the harmful effect of metallic particles to a specific region while preserving their beneficial effect in another region.
Solution Approach 2:
The dielectric layer is segmented into multiple functional layers: a composite layer with metallic particles for enhancing dielectric constant, and protective layers without metallic particles for ensuring reliability. This segmentation separates the conflicting requirements into different spatial zones, allowing both high dielectric constant and high reliability to be achieved simultaneously.
2Quantity of substance
If number of stacked layers or electrode area is increased to achieve high capacitance, then capacitance is improved, but miniaturization is limited
Solution Approach 1:
The patent changes the material composition parameter by incorporating metallic particles into the dielectric layer to form a composite structure. This parameter change increases the dielectric constant, allowing higher capacitance to be achieved without increasing the physical dimensions of the capacitor, thus resolving the contradiction between capacitance and miniaturization.
Solution Approach 2:
The patent uses composite materials by combining BaTiO3 dielectric material with metallic particles to create a composite dielectric layer. This composite structure provides enhanced dielectric properties that enable high capacitance in a compact form factor, overcoming the limitation of increasing stacked layers or electrode area.
3Reliability
If thickness of protective layers is increased to prevent shorts, then reliability is improved, but dielectric layer thickness is reduced
Solution Approach 1:
The patent optimizes the thickness parameter of protective layers to be at least one-third of the total dielectric layer thickness. This parameter setting provides sufficient protection against shorts between internal electrodes while maintaining adequate overall dielectric layer thickness for electrical performance, resolving the contradiction between reliability and dielectric thickness.
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 increases the dielectric constant by about 60% and maintains capacitance variance ratio similar to comparative examples, with improved reliability under DC bias and increased electric field conditions, as demonstrated by the comparative graph and lifetime tests.
Implementation Method 1
distributing metallic particles in BaTiO3 and adding a space charge effect at a BaTiO3/metal interface
Implementation Method 2
first and second protective layers spaced apart by the composite layer and including a second dielectric material
Data Source
AI summary
A capacitor component includes a body in which a dielectric layer and an internal electrode are alternately stacked, and an external electrode disposed on the body and connected to the internal electrode. The dielectric layer includes a composite layer including a dielectric material powder and a metallic particle and first and second protective layers including a dielectric material powder and spaced apart by the composite layer. A thickness of each of the first and second protective layers is equal to or greater than ⅓ of a thickness of the dielectric layer.