Aluminum Electrode Ferroelectric Substrate Cost Reduction
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Solution Overview
Problem
The development of cost-effective lead-free niobate-based ferroelectric thin-film devices is hindered by the need for suitable lamination structures and manufacturing processes, as well as the challenge of maintaining performance and properties while reducing costs, particularly with the use of materials like platinum and gold in existing piezoelectric devices.
Innovation Solution
A ferroelectric thin-film laminated substrate is created with a platinum or platinum alloy lower electrode, a sodium potassium niobate ferroelectric thin-film layer, an aluminum or aluminum alloy upper electrode, and an upper electrode intermediate layer made from metals with low oxidizability that form intermetallic compounds with aluminum, such as nickel, cobalt, tungsten, or molybdenum, to reduce costs while maintaining performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If platinum or gold electrodes are used in lead-free niobate-based ferroelectric thin-film devices, then the device performance and polarization properties are maintained, but the manufacturing cost increases
Solution Approach 1:
The patent replaces expensive platinum and gold electrodes with cheaper aluminum electrodes in lead-free niobate-based ferroelectric thin-film devices. This substitution significantly reduces manufacturing costs while the patent ensures device performance is maintained through optimized aluminum electrode configurations and processing conditions
Solution Approach 2:
The patent modifies electrode material parameters by transitioning from noble metals (Pt, Au) to aluminum, and adjusts processing parameters such as deposition conditions and heat treatment to optimize the aluminum electrode's performance. This parameter change enables cost reduction while preserving the necessary electrical and mechanical properties for device functionality
2Object-affected harmful factors
If lead-free niobate-based materials are used instead of PZT, then environmental compliance is improved, but the available manufacturing processes and lamination structures are limited
Solution Approach 1:
The patent adjusts manufacturing parameters including deposition temperature, oxygen partial pressure, and heat treatment conditions to enable successful fabrication of lead-free niobate-based thin films. These parameter optimizations overcome the immaturity of manufacturing processes for lead-free materials while maintaining device performance
Solution Approach 2:
The patent employs composite structures combining lead-free niobate-based ferroelectric thin films with aluminum electrodes and appropriate buffer/adhesion layers. This composite approach addresses the limitations of lead-free materials by creating a synergistic structure that enables successful manufacturing while achieving environmental compliance
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 allows for the reduction of costs in niobate-based ferroelectric thin-film devices while maintaining their performance and properties, as demonstrated by the preservation of polarization properties in the thin-film devices.
Implementation Method 1
a part of the upper electrode intermediate layer and a part of the upper electrode layer are alloyed
Implementation Method 2
Piezoelectric devices utilize the piezoelectric effect of a ferroelectric material, and are widely used as functional devices such as actuators and stress sensors
Implementation Method 3
Pyroelectric devices detect light (including infrared light) utilizing the pyroelectric effect of a ferroelectric material
Data Source
AI summary
There is provided a ferroelectric thin-film laminated substrate, including a substrate, and further including a lower electrode layer, a ferroelectric thin-film layer, an upper electrode intermediate layer, and an upper electrode layer being sequentially stacked on the substrate, in which: the lower electrode layer is made of platinum or a platinum alloy; the ferroelectric thin-film layer is made of a sodium potassium niobate (typical chemical formula of (K1-xNax)NbO3, 0.4≤x≤0.7); the upper electrode layer is made of aluminum or an aluminum alloy; the upper electrode intermediate layer is made of a metal that has less oxidizability than titanium and can generate an intermetallic compound with Aluminum; and a part of the upper electrode intermediate layer and a part of the upper electrode layer are alloyed.