Silver Electrode Crystal Control for Stable Resistivity
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Solution Overview
Problem
Silver electrodes formed by vacuum vapor deposition exhibit significant resistivity fluctuations with temperature changes, leading to sensor errors that conventional software corrections cannot fully address.
Innovation Solution
A silver electrode with a specific X-ray diffraction pattern and a protective layer, formed by reducing silver oxide with a hindered amine light stabilizer at a low temperature, to minimize resistivity changes due to temperature fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vacuum vapor deposition method is used to form silver layer, then low resistivity at room temperature is achieved, but resistivity fluctuates significantly with temperature change
Solution Approach 1:
The patent changes the formation method parameters from vacuum vapor deposition to chemical reduction using hindered amine light stabilizer, and controls the crystal orientation to produce (111) plane predominance. This parameter change results in a silver layer with significantly reduced temperature coefficient of resistivity, maintaining stable electrical properties across temperature variations from -30°C to 85°C
Solution Approach 2:
The patent creates a composite structure where the silver layer is formed through chemical reduction process with specific crystal orientation, combining metallic silver with controlled crystalline structure. The presence of hindered amine light stabilizer residues and specific grain boundary characteristics creates a composite microstructure that suppresses temperature-induced resistivity changes
2Strength
If vacuum vapor deposition is used, then silver layer is formed quickly, but adhesion to substrate is insufficient
Solution Approach 1:
The hindered amine light stabilizer acts as a chemical intermediary during the formation process. It reduces silver ions to metallic silver while its molecular structure facilitates strong bonding to the substrate surface. This intermediary substance enables both rapid formation and strong adhesion simultaneously, eliminating the trade-off between speed and bonding strength
Solution Approach 2:
The patent replaces the physical vapor deposition mechanism with a chemical reduction mechanism. Instead of relying on kinetic energy of vaporized silver atoms for adhesion, the chemical bonds formed during reduction provide strong substrate attachment. This substitution of mechanical process with chemical process achieves both speed and adhesion
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 electrode exhibits minimal resistivity variation with temperature, enhanced thermal stability, and improved adhesion to the substrate, reducing sensor errors and extending durability.
Implementation Method 1
an oxidizing agent including silver is reduced by a reducing agent including an organic compound with the oxidizing agent in contact with the substrate, thereby the silver layer being laminated on the substrate
Implementation Method 2
an alloy layer including a copper component and a silver component is formed in an interface between the substrate and the silver layer
Data Source
AI summary
The present invention provides a silver electrode having smaller change in resistivity due to temperature change as compared with the related arts, and a method of manufacturing the silver electrode. The silver electrode is configured to have one peak in a range of a diffraction angle 2θ=37.5° to 38.3° in an X-ray diffraction pattern measured by an X-ray diffractometer using a CuKα1 ray, and a change rate of the diffraction angle of the peak after heated at 150° C. for 30 minutes is less than or equal to 0.5%. In this way, the silver electrode has smaller change in resistivity due to temperature change as compared with the related arts.