Multilayer Capacitor Interface Composition for Electrode Connectivity
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Solution Overview
Problem
Multilayer ceramic capacitors face challenges in achieving higher capacitance and reliability due to internal electrode agglomeration and disconnection, particularly when using fine-grained metal powder particles, and require improved connectivity and uniform thickness to meet the demands of smaller and higher-performance electronic devices.
Innovation Solution
Incorporating specific atomic ratios of indium (In) relative to titanium (Ti) and nickel (Ni) in the dielectric and internal electrodes, respectively, to enhance bonding strength and act as a semiconductor barrier, improving connectivity and suppressing agglomeration and disconnection, thereby enhancing capacitance and high-temperature load life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If fine-grained metal powder particles are used to reduce internal electrode thickness, then capacitance per unit volume increases, but sintering-shrinkage initiation temperature decreases causing internal electrode agglomeration or disconnection
Solution Approach 1:
The patent applies local quality by creating a specific indium concentration distribution within the internal electrode. The indium content is controlled to be 0.3-3.8 at% in the region 2nm from the dielectric layer interface, which is higher than in other regions. This localized compositional variation improves bonding at the critical interface region while maintaining overall electrode integrity, resolving the contradiction between reduced thickness and connectivity reliability.
Solution Approach 2:
The patent changes the chemical composition parameter by introducing indium into the internal electrode and controlling its concentration at the interface region. This parameter change modifies the sintering behavior and bonding characteristics, allowing fine-grained particles to maintain connectivity while achieving higher capacitance density. The indium addition raises the effective sintering temperature and prevents premature shrinkage.
2Quantity of substance
If internal electrode thickness is reduced to increase stacked layers, then capacitance increases, but manufacturing precision becomes more difficult to maintain
Solution Approach 1:
The patent implements local quality by concentrating indium at the interface region (2nm from dielectric layer) rather than uniformly distributing it throughout the internal electrode. This localized enrichment at the critical bonding interface improves adhesion and thickness uniformity control during sintering, enabling manufacturing of thinner electrodes with consistent dimensions and higher capacitance.
3Reliability
If indium content is increased to improve bonding strength, then reliability improves, but capacitance may decrease due to reduced electron movement
Solution Approach 1:
The patent resolves this contradiction by applying local quality - concentrating indium specifically in the interface region (2nm from dielectric layer) where bonding is critical, while keeping indium content lower in the bulk electrode material. This spatial differentiation allows strong bonding at the interface (improving reliability) while maintaining good electron transport in the bulk (preserving capacitance).
Solution Approach 2:
The patent optimizes the indium concentration parameter by setting it to 0.3-3.8 at% in the interface region, which is the optimal range achieved through experimentation. This parameter optimization balances the competing requirements of bonding strength and electrical conductivity, achieving both high reliability and adequate capacitance.
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 the reliability and capacitance of multilayer electronic components by stabilizing the interface between dielectric and internal electrodes, reducing electron movement, and enhancing high-temperature performance.
Implementation Method 1
Incorporating specific atomic ratios of indium (In) relative to titanium (Ti) and nickel (Ni) in the dielectric and internal electrodes, respectively, to enhance bonding strength and act as a semiconductor barrier
Implementation Method 2
An average content of indium (In) relative to titanium (Ti) satisfies 0.3 at % or more and 3.8 at % or less in a region of the dielectric layer that is spaced apart by 2 nm from an interface thereof with the internal electrode
Data Source
AI summary
A multilayer electronic component includes: a body including a dielectric layer and an internal electrode; and external electrodes disposed on the body. An average content of indium (In) relative to titanium (Ti) satisfies 0.3 at % or more and 3.8 at % or less in a region of the dielectric layer that is spaced apart by 2 nm from an interface thereof with the internal electrode.