MLCC Interface Sn Doping for Moisture-Resistant Reliability
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Solution Overview
Problem
Multilayer ceramic capacitors face challenges in miniaturization and capacitance increase due to decreased reliability caused by thin side margin portions and suppressed grain growth, which affects dielectric constant and capacitance.
Innovation Solution
Incorporating Sn in the interface and side margin portions of multilayer electronic components, rather than internal electrodes, to enhance Schottky barriers and hydrogen adsorption, thereby improving high-temperature load life and moisture resistance without altering existing sintering conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If side margin portions are separately attached to increase internal electrode area, then capacitance per unit volume is improved, but thickness of side margin portions decreases and reliability deteriorates
Solution Approach 1:
The patent applies local quality by adding Sn specifically to the interface portion between the internal electrode and dielectric layer, rather than uniformly throughout the structure. This localized modification enhances the Schottky barrier at the critical interface region, improving reliability without requiring increased side margin thickness or altering the overall miniaturized design.
2Reliability
If grain growth of dielectric grains is suppressed to increase grain boundaries, then reliability is improved, but dielectric constant decreases and capacitance increases become difficult
Solution Approach 1:
The patent changes the chemical composition parameter by adding Sn to the interface portion between the internal electrode and dielectric layer. This compositional modification alters the electrical properties at the interface, enhancing the Schottky barrier height and improving reliability without requiring changes to grain size or dielectric constant.
3Reliability
If Sn is added to internal electrodes to improve reliability, then high temperature load life and moisture resistance are enhanced, but sintering conditions must be altered
Solution Approach 1:
The patent extracts Sn from the internal electrode material and places it specifically in the interface portion between the internal electrode and dielectric layer. This separation allows the Sn to provide reliability benefits at the critical interface region without being incorporated into the internal electrode bulk, thereby avoiding the need to modify sintering conditions for the entire component.
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
This approach improves the reliability and capacitance of multilayer ceramic capacitors by maintaining existing design and sintering conditions, while effectively increasing the Schottky barrier and reducing hydrogen diffusion, leading to enhanced performance in miniaturized components.
Implementation Method 1
the interface portion and one of the side margin portions include Sn... enhance Schottky barriers... effectively increasing the Schottky barrier
Implementation Method 2
enhance Schottky barriers and hydrogen adsorption... reducing hydrogen diffusion
Data Source
AI summary
A multilayer electronic component includes: a body including dielectric layers and having first and second surfaces opposing each other in a first direction, third and fourth surfaces connected to the first and second surfaces and opposing each other in a second direction, and fifth and sixth surfaces connected to the first to fourth surfaces and opposing each other in a third direction; side margin portions disposed on the fifth and sixth surfaces, respectively; and external electrodes disposed on the third and fourth surfaces, respectively. The body includes an active portion including internal electrodes disposed alternately with the dielectric layers in the first direction, one of the internal electrodes includes a central portion and an interface portion disposed between the central portion and one of the dielectric layers, and the interface portion and one of the side margin portions include Sn.