Flat Dielectric Layer in Electronic Components
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Solution Overview
Problem
Conventional electronic components face issues with structural defects like cracks in the inorganic dielectric layer due to uneven coverage, leading to reliability degradation, and increased inter-electrode distance reducing capacitance performance.
Innovation Solution
An electronic component design featuring a flat upper surface of the inorganic dielectric layer positioned higher than the capacitor lower electrode, with a composition including an inorganic dielectric material and glass material, allowing for improved leveling and increased film thickness at edge parts to prevent cracks and maintain capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the inorganic dielectric layer is formed with constant thickness in conformity to the shape of the lower electrode, then the manufacturing precision is improved, but the reliability deteriorates due to poor coverage at edge parts causing cracks
Solution Approach 1:
The inorganic dielectric layer is designed with non-uniform thickness distribution: thicker at edge parts of the lower electrode to ensure coverage and prevent cracks, and thinner at central parts to maintain capacitance performance. This local variation in thickness resolves the contradiction between manufacturing precision and reliability.
2Reliability
If the thickness of the inorganic dielectric layer is uniformly increased to ensure quality coverage, then the reliability is improved, but the capacitance performance deteriorates due to increased inter-electrode distance
Solution Approach 1:
The dielectric layer thickness is optimized locally: increased at edge parts to ensure coverage quality and prevent cracks, while kept thinner at central parts to maintain small inter-electrode distance and high capacitance. This resolves the contradiction between reliability and capacitance performance.
3Ease of manufacture
If the inorganic dielectric layer conforms to the shape of the lower electrode, then the ease of manufacture is improved, but the reliability deteriorates due to stress concentration at edge parts
Solution Approach 1:
The dielectric layer is formed with different thickness characteristics at different locations: at edge parts, it extends beyond the lower electrode profile to provide stress relief and prevent cracks, while at central parts, it follows the electrode shape. This local differentiation resolves the contradiction between ease of manufacture and stress resistance.
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
Prevents structural failures such as cracks in the inorganic dielectric layer, enhances reliability, and maintains capacitance performance by ensuring adequate coverage and thickness without compromising the inductor characteristics.
Implementation Method 1
the glass material softens before sintering of the inorganic dielectric material, resulting in better fluidity of the inorganic dielectric layer
Implementation Method 2
the glass material softens before sintering of the inorganic dielectric material
Data Source
AI summary
An electronic component including a substrate, a capacitor lower electrode disposed on the substrate, an inorganic dielectric layer disposed on the substrate to cover the lower electrode, a capacitor upper electrode disposed directly on the inorganic dielectric layer and facing the lower electrode via the inorganic dielectric layer, and a coil electrically connected to the lower electrode or the upper electrode. The upper surface of the inorganic dielectric layer is flat.