Composite-Doped Ferroelectric Thin Films Against Dielectric Breakdown
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Solution Overview
Problem
Ferroelectric thin films made from Sc-doped aluminum nitride (Al1-xScxN) with Sc concentrations below 0.22 suffer from dielectric breakdown before reaching the coercive electric field, preventing the formation of stable ferroelectric thin films with sufficient thickness for practical applications.
Innovation Solution
A ferroelectric thin film represented by the chemical formula M1(1-X)M2XN, where M1 is aluminum (Al) or gallium (Ga), M2 is magnesium (Mg), scandium (Sc), ytterbium (Yb), or niobium (Nb), and X is within the range of 0 to 1, is developed. This formulation allows for the creation of thin films with higher ferroelectric properties and stability, even at lower Sc concentrations than previously thought to be effective.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the Sc concentration X in Al1-xScxN is lower than 0.22, then the dielectric breakdown occurs before the coercive electric field is reached, but the patent achieves stable ferroelectric properties at lower Sc concentrations by introducing additional dopants
Solution Approach 1:
The patent employs composite doping by combining Sc with at least one of Mg, Yb, or Nb in AlN-based ferroelectric thin films. This composite material approach allows the system to achieve stable ferroelectric properties at lower Sc concentrations (X ≤ 0.22) by leveraging the synergistic effects of multiple dopants, thereby preventing dielectric breakdown while maintaining ferroelectric stability.
Solution Approach 2:
The patent modifies the compositional parameters of the ferroelectric thin film by introducing additional dopants (Mg, Yb, Nb) alongside Sc. This parameter change enables the system to achieve the desired ferroelectric stability at lower Sc concentrations, fundamentally altering the material's electrical properties to prevent dielectric breakdown.
2Reliability
If a sufficient thickness (600 nm or more) of the ferroelectric thin film is not available, then the ferroelectric properties are insufficient and stability is compromised, but the patent achieves practical stability at thinner film thicknesses
Solution Approach 1:
The patent changes the compositional parameters by introducing composite doping with Sc and additional elements (Mg, Yb, Nb). This parameter modification enables the ferroelectric thin film to achieve practical stability at reduced thicknesses, eliminating the requirement for 600 nm or more thickness while maintaining sufficient ferroelectric properties.
Solution Approach 2:
The patent enhances the local quality of the ferroelectric thin film through targeted doping at specific compositional ratios. By optimizing the local distribution and concentration of Sc combined with Mg, Yb, or Nb dopants, the film achieves improved ferroelectric stability at thinner overall thicknesses, with the dopant-rich regions providing enhanced local ferroelectric activity.
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 new ferroelectric thin film exhibits significantly higher ferroelectric properties and stability compared to traditional Al1-xScxN films, enabling their use in practical applications without dielectric breakdown, even at thinner film thicknesses.
Implementation Method 1
Ferroelectric bodies (ferroelectric thin films), a kind of dielectric body, refer to a substance in which electric dipoles are aligned in the absence of an external electric field and directions of the dipoles can vary depending on the electric field
Implementation Method 2
Such ferroelectric bodies are a dielectric body having pyroelectric properties and piezoelectric properties in addition to ferroelectric properties
Implementation Method 3
Such ferroelectric bodies are a dielectric body having pyroelectric properties and piezoelectric properties in addition to ferroelectric properties
Data Source
AI summary
It is an object to provide a ferroelectric thin film having much higher ferroelectric properties than conventional Sc-doped ferroelectric thin film constituted by aluminum nitride and also having stability when applied to practical use, and also to provide an electronic device using the same.There are provided a ferroelectric thin film represented by a chemical formula M11-XM2XN, wherein M1 is at least one element selected from Al and Ga, M2 is at least one element selected from Mg, Sc, Yb, and Nb, and X is within a range of 0 or more and 1 or less, and also an electronic device using the same.