MLCC Dielectric Grain Doping for DC-Bias Stability and Reliability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Multilayer ceramic capacitors (MLCCs) face challenges in maintaining high reliability and DC-bias characteristics as they become thinner and more highly integrated, requiring improved dielectric materials to support increased voltage applications.
Innovation Solution
A multilayer ceramic capacitor design incorporating a dielectric grain structure with a barium titanate-based primary component and secondary components such as samarium (Sm) and lanthanum-based elements, along with optional aluminum, silicon, or magnesium, to enhance DC-bias characteristics and reliability, with a core-shell configuration of Sm and a higher concentration in the shell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If MLCCs are made thinner for high integration, then device size is reduced, but reliability and DC-bias characteristics deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the dielectric material by introducing specific secondary components (稀土元素 like La, Ce, Pr, Nd, Sm, and other metal elements like Al, Si, Mg, Mn) in controlled amounts to maintain reliability in thinner MLCC structures
Solution Approach 2:
The patent creates a composite dielectric material system combining barium titanate primary component with multiple secondary components (rare earth elements and metal elements) to achieve both thin-layer compatibility and high reliability
2Volume of moving object
If MLCCs are made thinner for high integration, then device size is reduced, but DC-bias characteristics deteriorate
Solution Approach 1:
The patent optimizes composition parameters including the content of secondary components (1-10 wt% rare earth elements, 0.1-5 wt% metal elements) and sintering conditions to maintain DC-bias characteristics in thinner devices
Solution Approach 2:
The patent develops a composite dielectric material with barium titanate and multiple secondary components that work synergistically to preserve DC-bias performance despite reduced device thickness
3Reliability
If secondary component content is increased to improve reliability, then material complexity increases, but manufacturing difficulty increases
Solution Approach 1:
The patent defines specific parameter ranges for secondary component content (1-10 wt% rare earth, 0.1-5 wt% metal elements) to balance reliability improvement with manufacturing feasibility
Solution Approach 2:
The patent applies different secondary components at different stages or locations in the material structure to achieve reliability enhancement while controlling manufacturing complexity
Data Source
AI summary
A multilayer ceramic capacitor may include a capacitor body including a dielectric layer and an internal electrode layer, and an external electrode disposed outside the capacitor body, where the dielectric layer may include at least one dielectric grain, where the dielectric grain may include a barium titanate-based primary component including barium (Ba) and titanium (Ti), and a secondary component, where the secondary component may include samarium (Sm) as a first secondary component, and a second secondary component, where the second secondary component may include lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), lutetium (Lu), or a combination thereof, and where the second secondary component may be included in an amount ranging from 1.2 atom % to 2.0 atom % based on 100 atom % of titanium (Ti).