Oxide Capacitor Vacancy Gradient for Tunable Charge Storage
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Solution Overview
Problem
Characterizing and controlling oxygen vacancies in metal oxides is challenging due to their dilute concentrations, which hinders the development of functional metal oxide devices, particularly in electronic and optical applications.
Innovation Solution
The formation of self-doped aluminum oxide dipoles by positive charged oxygen vacancies and electrons, facilitated by an oxygen deficiency-profile-thickness, creates a vacancy-gradient-film that enables active capacitors with tunable voltage-controlled supercapacitor performance, utilizing a two-layer interface comprising an Al2O3 insulating film and a vacancy-gradient-film with increasing vacancy concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If oxygen vacancies are introduced to create functional metal oxide devices, then the electrical and optical properties are improved, but the characterization and control become difficult due to dilute concentrations
Solution Approach 1:
The patent changes the concentration parameter of oxygen vacancies from dilute to high concentration by creating oxygen-deficient regions through controlled deposition processes. This transformation makes the vacancies detectable and controllable while maintaining their functional benefits for electrical and optical properties
Solution Approach 2:
The patent creates spatially non-uniform oxygen vacancy distributions with gradient profiles, where different regions of the metal oxide layer have different vacancy concentrations. This local variation enables both characterization (through measurable gradients) and functional performance (through optimized local properties)
2Power
If oxygen deficiency is increased to create plasmonic properties, then the capacitance and conductivity are improved, but the insulating properties deteriorate
Solution Approach 1:
The patent creates a multi-layer structure where different regions have different oxygen deficiency levels. The gradient profile ensures that regions with high capacitance (high vacancy concentration) are spatially separated from regions requiring insulating properties, allowing both functions to coexist in the same device
Solution Approach 2:
The patent creates a composite metal oxide structure with varying stoichiometry (AlOx where x varies spatially), combining regions of different electrical properties. This composite approach enables the overall structure to exhibit both high capacitance and adequate insulating performance through the synergistic arrangement of different compositional regions
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 results in plasmonic capacitors that exhibit insulator-to-conductor resistive switches and high capacitance, with oxygen vacancies acting as movable charges and confined electrons forming dipoles that respond to electrical fields, enhancing charge storage capabilities and enabling frequency and bias voltage-dependent transitions.
Implementation Method 1
Vacancy and confined electrons may form dipoles, acting like electric springs because vacancy can respond to an electrical field but confined electrons may not response to the electric field
Implementation Method 2
vacancy can respond to an electrical field but confined electrons may not response to the electric field
Implementation Method 3
The vacancy-gradient-film may cause a negative capacitance region to be created
Implementation Method 4
Active capacitors may form when vacancy concentration in a constant vacancy region reaches a critical concentration where vacancy hopping conduction may take place
Implementation Method 5
A function of a two-layer interface is described, comprising Al2O3'insulating' film and 'vacancy-gradient-film' with gradually increasing vacancy
Data Source
AI summary
A capacitor may comprise a substrate and a first electrically conductive electrode layer. A metal oxide layer may be deposited on at least one of the substrate or the first electrically conductive electrode layer. A proximal region of the metal oxide may comprise a stoichiometric, dielectric, oxygen vacancy-free portion of the metal oxide. The proximal region may be in communication with the first electrically conductive electrode layer. A distal region of the metal oxide may comprise a constant oxygen vacancy portion. The distal region may be in communication with a second electrically conductive electrode layer. The metal oxide may comprise a gradient region comprising a substantially stoichiometric metal oxide portion and a substantially constant oxygen vacancy portion. The gradient region may comprise an increasing oxygen vacancy gradient from the proximal region to the distal region. The second electrically conductive electrode layer may be deposited on the distal region.