Sn-Rich Multilayer Capacitor Interfaces for Thin-Dielectric Reliability
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Solution Overview
Problem
Multilayer ceramic capacitors with reduced dielectric layer thickness face challenges in maintaining high-temperature reliability and withstand voltage properties.
Innovation Solution
A multilayer capacitor design incorporating a barium titanate composition with a Sn component in both the dielectric layers and internal electrodes, where the dielectric layers have a Sn content at least twice that of the adjacent internal electrodes, and both include Sn-rich regions with a combined thickness of 5 nm or less.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the dielectric layer thickness is reduced to achieve smaller capacitor size, then the capacitor size is reduced, but the high-temperature reliability and withstand voltage properties deteriorate
Solution Approach 1:
The patent applies local quality by creating Sn-rich regions specifically at the interface between the dielectric layer and internal electrode, rather than uniformly distributing Sn throughout the dielectric layer. This localized enrichment of Sn at the critical interface region improves high-temperature reliability and withstand voltage properties without requiring increased dielectric layer thickness, thus maintaining the reduced capacitor size while addressing the reliability deterioration issue.
2Volume of moving object
If the dielectric layer thickness is reduced to achieve smaller capacitor size, then the capacitor size is reduced, but the withstand voltage properties deteriorate
Solution Approach 1:
The patent creates Sn-rich regions localized at the dielectric layer-internal electrode interface to enhance withstand voltage properties. This local enrichment provides improved electrical breakdown resistance at the critical interface region where voltage stress is concentrated, allowing the dielectric layer to maintain adequate withstand voltage capability even at reduced thickness.
Solution Approach 2:
The patent employs a composite structure consisting of the dielectric layer with embedded Sn-rich regions. This composite approach combines the base dielectric material with concentrated Sn phases at the interface, creating a material system that exhibits enhanced withstand voltage properties beyond what the base dielectric alone could provide at reduced thickness.
3Reliability
If the Sn content in the dielectric layer is increased to improve reliability, then the high-temperature reliability is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent reduces manufacturing complexity by localizing Sn enrichment to specific interface regions rather than requiring uniform Sn distribution throughout the entire dielectric layer. This localized approach allows for more controlled and manageable manufacturing processes, as the Sn-rich regions can be formed through targeted processing steps at the interface rather than requiring precise control of Sn content throughout the bulk material.
Data Source
AI summary
A multilayer capacitor includes a body including a plurality of dielectric layers and a plurality of internal electrodes laminated with the dielectric layers interposed therebetween, and an external electrode disposed externally on the body and connected to one or more of the plurality of internal electrodes. One of the plurality of dielectric layers includes a barium titanate composition including a Sn component. One of the plurality of internal electrodes includes a Sn component. The one of the plurality of dielectric layers has a Sn content equal to at least twice a Sn content of the one of the plurality of internal electrodes adjacent to the one of the plurality of dielectric layers.