Relaxor-Ferroelectric Material for Stable Capacitance
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Solution Overview
Problem
Highly integrated and miniaturized electronic devices face challenges in maintaining stable capacitance due to the weakening of ferroelectric characteristics in dielectric materials like BaTiO3, which experience rapid permittivity decrease under high electric fields as the thickness decreases, leading to ineffective dielectric performance.
Innovation Solution
The development of relaxor-ferroelectric materials with a solid solution concentration of 5 mol% to 20 mol% that include regions with different polarization characteristics, allowing for high permittivity even under high electric fields by responding to AC sweeping, thereby maintaining dielectric characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the dielectric thickness is decreased to achieve miniaturization, then the device size is reduced, but the permittivity decreases rapidly under high electric fields
Solution Approach 1:
The patent employs a composite material system consisting of a ferroelectric base material (such as Pb(Zr,Ti)O3 or Pb1-xLaxZr1-yTiyO3) combined with specific dopant elements. This composite structure allows the material to maintain high permittivity and ferroelectric characteristics even when used in thin-film configurations, thereby enabling miniaturization while preserving dielectric performance.
Solution Approach 2:
The patent modifies the chemical composition parameters of the dielectric material by controlling the ratios of zirconium to titanium, and by introducing specific dopant elements in controlled amounts. These parameter changes enable the material to exhibit enhanced permittivity stability under high electric fields, allowing thin-film devices to maintain reliable capacitance values despite reduced thickness.
2Device complexity
If conventional ferroelectric materials like BaTiO3 are used, then the material structure is simple, but the permittivity decreases rapidly under high electric fields
Solution Approach 1:
The patent systematically varies the compositional parameters of the ferroelectric material, specifically the Zr/Ti ratio and dopant concentration, to optimize permittivity stability. By adjusting these parameters, the material achieves enhanced resistance to permittivity degradation under high electric fields while maintaining a relatively straightforward perovskite crystal structure suitable for device fabrication.
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 relaxor-ferroelectric materials effectively maintain high permittivity and stability under high electric fields, improving the dielectric performance and temperature stability compared to conventional ferroelectric materials like BaTiO3, making them suitable for use in capacitors and other electronic devices.
Implementation Method 1
a ferroelectric material having a first polarization characteristic; and a plurality of regions spaced apart from each other, the plurality of regions having a second polarization characteristic different from the first polarization characteristic
Implementation Method 2
the capacitance of the capacitor may be determined according to the permittivity of a dielectric used in the capacitor
Implementation Method 3
The ferroelectric material having the first polarization characteristic and the plurality of regions may have different response characteristics with respect to alternating current (AC) sweeping
Data Source
AI summary
A relaxor-ferroelectric material, a method of synthesizing the same and a device including the relaxor-ferroelectric material are provided. The relaxor-ferroelectric material includes a ferroelectric material having a first polarization characteristic. The ferroelectric material having the first polarization characteristics includes a plurality of regions having a second polarization characteristic and spaced apart from each other, and the first polarization characteristic and the second polarization characteristic are different from each other. The ferroelectric material having the first polarization characteristics and the plurality of regions have different response characteristics with respect to alternating current (AC) sweeping. The plurality of regions may include a solid solution.