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, necessitating a solution to enhance the reliability of capacitor components.
Innovation Solution
A capacitor component design featuring internal electrode layers and a dielectric layer with varying molybdenum content, where the central portion of the dielectric layer has a lower molybdenum content than the outer portion, and the internal electrode layers contain a nickel-molybdenum alloy, improving thermal stability and reducing sintering mismatch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the dielectric layer becomes thinner to improve capacitance, 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. The outer region (within 100 nm from the interface) contains 0.5-2.0 at% Mo to improve interface stability and reduce sintering mismatch, while the inner region contains 0.05-0.3 at% Mo to maintain dielectric performance. This spatial variation in composition allows the thin dielectric layer to maintain both high capacitance and improved temperature characteristics.
2Quantity of substance
If the dielectric layer becomes thinner to improve capacitance, then capacitance is improved, but electrical characteristics such as DC-bias deteriorate
Solution Approach 1:
The patent implements local quality by concentrating higher molybdenum content (0.5-2.0 at%) in the outer region of the dielectric layer adjacent to the internal electrode. This localized enrichment improves electrical characteristics including DC-bias behavior by stabilizing the electrode-dielectric interface, while the thinner overall dielectric thickness maintains high capacitance.
3Quantity of substance
If the dielectric layer becomes thinner to improve capacitance, then capacitance is improved, but reliability deteriorates
Solution Approach 1:
The patent applies local quality by creating a molybdenum concentration gradient in the dielectric layer. The outer region (within 100 nm from the interface) contains 0.5-2.0 at% Mo to enhance interface stability and reduce sintering mismatch, improving reliability. The inner region contains lower Mo content (0.05-0.3 at%) to maintain dielectric properties. This non-uniform distribution enables thin dielectric layers to achieve both high capacitance and improved reliability.
Solution Approach 2:
The patent employs parameter changes by precisely controlling the molybdenum concentration at different positions within the dielectric layer. The Mo content varies from 0.05-0.3 at% in the inner region to 0.5-2.0 at% in the outer region, with the sintering temperature controlled at 900-950°C. These parameter optimizations enable the thin dielectric layer to maintain reliability while achieving high capacitance.
4Stability of the object's composition
If molybdenum content is increased in the dielectric layer to improve thermal stability, then thermal stability is improved, but sintering mismatch may occur
Solution Approach 1:
The patent resolves this contradiction by applying local quality with a non-uniform Mo distribution. The outer region (within 100 nm from the interface) contains 0.5-2.0 at% Mo to improve thermal stability and reduce sintering mismatch at the critical interface zone. The inner region contains lower Mo content (0.05-0.3 at%) to avoid excessive Mo accumulation that could cause sintering issues. This localized approach allows thermal stability enhancement without causing sintering mismatch.
Solution Approach 2:
The patent uses parameter changes by optimizing the Mo concentration gradient and sintering temperature (900-950°C). The Mo content is precisely controlled to be higher (0.5-2.0 at%) near the interface for thermal stability, while maintaining lower content (0.05-0.3 at%) in the bulk to prevent sintering mismatch. This parameter optimization resolves the contradiction between thermal stability and sintering compatibility.
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.