ESD Protection Device Using Core-Shell Metal Particles
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Solution Overview
Problem
Current ESD protection devices face challenges in maintaining high reliability of insulating properties while further reducing the discharge starting voltage.
Innovation Solution
The ESD protection device incorporates a discharge auxiliary electrode with core-shell structured metal particles, including first metal particles with a core-shell structure having a cavity and second metal particles with a core-shell structure without cavities, along with a binding agent, to enhance insulating properties and reduce discharge starting voltage. The device is manufactured using specific processes such as mechanofusion and atomizing to achieve core-shell structures with controlled thickness and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a discharge auxiliary electrode with metal particles is used to reduce discharge starting voltage, then the discharge starting voltage is reduced, but the insulating properties deteriorate
Solution Approach 1:
The patent uses core-shell structured metal particles where the core is made of one metal and the shell is made of a different metal with higher oxidizability. This composite structure allows the core to provide electrical conductivity for discharge while the shell provides insulating protection, thus reducing discharge starting voltage while maintaining insulating properties.
Solution Approach 2:
The patent applies different materials to different parts of the same particle - the core region has one material property (electrical conductivity) while the shell region has another material property (insulating capability). This local differentiation allows each part to fulfill its specific function, resolving the contradiction between conductivity and insulation.
2Reliability
If the shell section thickness is increased to improve insulating properties, then insulating reliability is improved, but discharge starting voltage increases
Solution Approach 1:
The patent optimizes the shell thickness to a specific range (50-500 nm) to achieve the best balance between insulating properties and discharge characteristics. This precise parameter control allows the shell to provide sufficient insulation while maintaining thin enough thickness to allow field concentration and low discharge starting voltage.
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
The solution provides ESD protection devices with high reliability of insulating properties and significantly reduced discharge starting voltage, ensuring effective protection against electro-static discharge.
Implementation Method 1
the shell section of each of the second metal particles has a thickness of about 1 nm to less than about 50 nm, for example. This allows an electric field to be readily concentrated
Implementation Method 2
a shell section which mainly includes an oxide of a second metal and which includes at least one portion having a cavity
Data Source
AI summary
An ESD protection device includes first and second discharge electrodes and a discharge auxiliary electrode that is electrically connected to the first and second discharge electrodes. The first and second discharge electrodes are located on or in an insulating substrate to at least partially face each other. The discharge auxiliary electrode includes first metal particles, second metal particles, and a binding agent. The first metal particles have a core-shell structure including a core section mainly including a first metal and a shell section which mainly includes an oxide of a second metal and which includes at least one portion with a cavity. The second metal particles have a core-shell structure including a core section mainly including the first metal and a shell section which mainly includes the oxide of the second metal and which has no cavity.