MLCC Dielectric Mo Gradient for Thin-Layer Reliability
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Solution Overview
Problem
The thinning of dielectric layers in MLCCs improves capacitance but deteriorates temperature characteristics, electrical characteristics, and reliability.
Innovation Solution
A capacitor component with internal electrode layers and a dielectric layer, where the dielectric layer has a central portion with a lower molybdenum content compared to its outer portion, and both the internal electrode layers and the dielectric layer contain molybdenum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the dielectric layer is made thinner, then capacitance is improved, but temperature characteristics and electrical characteristics deteriorate
Solution Approach 1:
The patent applies local quality by creating a non-uniform molybdenum distribution within the dielectric layer, where the outer portion contains 0.5-1.0 at% Mo and the central portion contains 0.05-0.5 at% Mo. This spatial variation in composition allows the outer regions to provide thermal stability and structural support, while the thinner overall layer maintains high capacitance. The differentiated Mo content addresses the contradiction by locally optimizing properties rather than using a uniform composition throughout.
Solution Approach 2:
The patent employs composite materials by combining barium titanate (BaTiO3) with molybdenum (Mo) in a non-uniform distribution. The dielectric layer consists of BaTiO3 as the base material with Mo added at specific concentrations in different regions. This composite structure enables the thin dielectric layer to maintain both high capacitance and improved temperature characteristics, resolving the contradiction between thinning for capacitance and maintaining reliability.
2Quantity of substance
If the dielectric layer is made thinner, then capacitance is improved, but electrical characteristics such as DC-bias deteriorate
Solution Approach 1:
The patent uses local quality by concentrating higher molybdenum content (0.5-1.0 at%) in the outer portions of the dielectric layer adjacent to the internal electrode layers. This localized Mo enrichment stabilizes the electrical characteristics and DC-bias performance at the critical interfaces, while the overall thin layer structure maintains high capacitance. The non-uniform distribution resolves the contradiction by protecting electrical performance where it matters most.
3Quantity of substance
If the dielectric layer is made thinner, then capacitance is improved, but reliability deteriorates
Solution Approach 1:
The patent applies local quality by creating a molybdenum concentration gradient within the dielectric layer, with higher Mo content (0.5-1.0 at%) in the outer portions and lower Mo content (0.05-0.5 at%) in the central portion. This spatial differentiation allows the thin dielectric layer to maintain high capacitance while the Mo-enriched outer regions provide enhanced reliability through improved thermal stability and defect reduction during high-temperature, high-humidity testing.
Solution Approach 2:
The patent employs composite materials by integrating molybdenum (Mo) into the barium titanate (BaTiO3) dielectric matrix at controlled, non-uniform concentrations. The Mo-BaTiO3 composite structure in the outer portions of the dielectric layer provides enhanced reliability properties, while the overall thin layer configuration maintains high capacitance. This composite approach resolves the contradiction between thinning for capacitance and maintaining reliability.
Data Source
AI summary
A capacitor component includes a body including internal electrode layers and a dielectric layer disposed between the internal electrode layers adjacent to each other and an external electrode disposed on one surface of the body, wherein the internal electrode layer and the dielectric layer separately include molybdenum (Mo), the dielectric layer has a central portion in a thickness direction and an outer portion disposed between the central portion and the internal electrode layer, and the content of molybdenum contained in the central portion of the dielectric layer is less than the content of molybdenum (Mo) contained in the outer portion of the dielectric layer.