MLCC Dielectric Interface Doping for High-Temperature Reliability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing multilayer ceramic capacitors face challenges in achieving ultra-high reliability under high temperature/high pressure/high humidity conditions, with limitations in dielectric constant, dissipation factor, temperature coefficient of capacitance, and insulation resistance, particularly in applications like electric vehicles.
Innovation Solution
A ceramic electronic component with a dielectric layer containing specific concentrations of In and Sn, and a manufacturing method involving a dielectric composition with 0.9-1.8 mol Sn and 0.05-0.1 mol In, along with a firing process in a hydrogen atmosphere, to create a first region with 0.5-2.0% In and 0.5-1.75% Sn content near the interfacial surface, enhancing capacitance and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional dielectric materials are used in multilayer ceramic capacitors, then the device structure is simple and manufacturing is easy, but the room-temperature dielectric constant is insufficient and high-temperature reliability is poor
Solution Approach 1:
The patent applies local quality by creating a first region in the dielectric layer adjacent to the internal electrode with specific In and Sn concentration ranges (In: 0.5-2.0 at%, Sn: 0.5-1.75 at%), while the second region has different composition. This localized compositional variation improves high-temperature reliability and insulation resistance at the critical electrode-dielectric interface without requiring uniform complexity throughout the entire dielectric layer.
Solution Approach 2:
The patent uses composite materials by combining multiple elements (In, Sn, and other dielectric components) in specific proportions within the dielectric layer. The first region contains In and Sn at controlled concentrations to enhance reliability, while maintaining overall dielectric functionality, creating a composite structure that achieves ultra-high reliability under high temperature, pressure, and humidity conditions.
2Reliability
If the dielectric layer composition is optimized for high dielectric constant, then capacitance increases, but the dissipation factor increases and temperature coefficient of capacitance deteriorates
Solution Approach 1:
The patent applies local quality by concentrating In and Sn elements specifically in the first region adjacent to the internal electrode, rather than uniformly distributing them throughout the dielectric layer. This localized approach improves temperature coefficient of capacitance stability at the critical interface region while minimizing the impact on overall dissipation factor, as the second region maintains optimized dielectric properties for low energy loss.
3Reliability
If the dielectric layer is made thinner to increase capacitance density, then miniaturization is achieved, but high-temperature insulation resistance decreases
Solution Approach 1:
The patent applies local quality by enhancing the composition of the first region adjacent to the internal electrode with specific In and Sn concentrations. This localized compositional optimization improves insulation resistance at the electrode-dielectric interface, which is the critical path for leakage current, allowing the use of thinner dielectric layers without compromising high-temperature insulation resistance.
Solution Approach 2:
The patent applies preliminary action by pre-configuring the dielectric layer composition during manufacturing, specifically incorporating In and Sn elements in the first region before the component is put into service. This preliminary compositional optimization ensures high insulation resistance from the outset, enabling miniaturization with thinner dielectric layers while maintaining reliability under high-temperature conditions.
4Reliability
If conventional manufacturing processes are used, then production is simple and cost-effective, but ultra-high reliability under harsh conditions cannot be achieved
Solution Approach 1:
The patent applies parameter changes by precisely controlling the concentration parameters of In and Sn elements in the first region (In: 0.5-2.0 at%, Sn: 0.5-1.75 at%). These parameter optimizations are integrated into the existing dielectric composition formulation, allowing standard manufacturing processes to produce the enhanced composition without requiring fundamentally new equipment or techniques, thus maintaining ease of manufacture while achieving ultra-high reliability.
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 improves the dielectric constant, reduces the dissipation factor, enhances temperature coefficient of capacitance, and increases high-temperature insulation resistance, resulting in improved mean-time to failure (MTTF) and reliability under harsh conditions.
Implementation Method 1
improve a room-temperature dielectric constant of a dielectric layer
Implementation Method 2
firing the laminate in an atmosphere including hydrogen at a concentration 0.2 vol % to 0.4 vol %
Data Source
AI summary
A ceramic electronic component includes a body including a dielectric layer and an internal electrode disposed alternately with the dielectric layer; and an external electrode disposed on the body, wherein the dielectric layer includes a first region extending from an interfacial surface with the internal electrode to 50 nm of the dielectric layer in an inward direction and a second region excluding the first region, and wherein, in the first region, an average content of In based on overall elements excluding oxygen is 0.5 at % or more and 2.0 at % or less, and an average content of Sn based on overall elements excluding oxygen is 0.5 at % or more and 1.75 at % or less.