Connection Electrode Mixed Layer Reduces Oxidation Resistance

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Solution Overview

Problem

The stacking of multiple metal films in connection electrodes leads to oxidation of the surface of the first metal film, increasing electrical resistance and degrading the electrical characteristics at the bonding portion between the films.

Innovation Solution

A mixed layer is formed by mixing first and second metal particles from the metal films, specifically located in a region overlapping the bonding plane between the extraction electrode and the second metal film, reducing resistivity and preventing degradation of electrical characteristics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple metal films are stacked to achieve various effects, then functional versatility is improved, but electrical resistance increases due to oxidation at bonding portions

Engineering Contradiction:
Improvefunctional effectsVSAvoidelectrical resistance
Core Design Contradiction:
Adaptability or versatilityVSReliability

Solution Approach 1:

A mixed layer comprising first metal particles from the first metal film and second metal particles from the second metal film is formed at the bonding interface between the metal films. This mixed layer acts as an intermediary that reduces electrical resistance and prevents oxidation degradation, thereby maintaining low electrical resistance while preserving the functional benefits of multiple stacked metal films

Inventive Principle:
Principle #24Intermediary (Mediator)

2Adaptability or versatility

If multiple metal films are stacked to achieve various effects, then functional versatility is improved, but bonding strength degrades due to oxidation at the bonding portion

Engineering Contradiction:
Improvefunctional effectsVSAvoidbonding strength
Core Design Contradiction:
Adaptability or versatilityVSStrength

Solution Approach 1:

The bonding interface between metal films is transformed into a composite structure consisting of a mixed layer containing both first metal particles and second metal particles. This composite mixed layer exhibits enhanced bonding strength and resistance to oxidation, allowing the stacked metal film structure to maintain both functional versatility and strong, reliable bonding interfaces

Inventive Principle:
Principle #40Composite materials

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 mixed layer reduces electrical resistance and prevents the degradation of electrical characteristics by enhancing the bonding strength and reliability between the metal films, thereby improving the overall performance of the connection electrodes.

Implementation Method 1

a mixed layer which includes first metal particles of the first metal film and second metal particles of the second metal film

Methodology Applied
Scientific EffectDiffusion: Diffusion

Data Source

PatentUS11508682B2Connection electrode and method for manufacturing connection electrode
Publication Date: 2022.11.22 MURATA MFG CO LTD
  • US11508682B2 patent drawing
  • US11508682B2 patent drawing
  • US11508682B2 patent drawing

AI summary

A connection electrode includes a first metal film, a second metal film, a mixed layer, and an extraction electrode. The second metal film is located on the first metal film, and the extraction electrode is located on the second metal film. The mixed layer includes a mix of metal particles of the first and second metal films. As viewed in a first direction in which the first metal film and the second metal film are on top of each other, at least a portion of the mixed layer is in a first region that overlaps a bonding plane between the extraction electrode and the second metal film.