3D Thin-Film Capacitor Structure for Higher Breakdown Voltage
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Solution Overview
Problem
Current capacitors, including supercapacitors, lack sufficient energy density and breakdown voltage to effectively replace battery storage, and face challenges in scalability and mass production, limiting their integration into renewable energy systems and electronic circuits.
Innovation Solution
Employing atomic layer deposition (ALD) to create thin-film capacitors with high dielectric constant materials like TiO2, ZrO2, and Al2O3, and incorporating three-dimensional structures with well-interconnected pores to enhance capacitance and reduce diffusion paths, while using plasma-assisted ALD to lower deposition temperatures and improve film quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If thin-film capacitors with high dielectric constant materials are used, then capacitance and energy density are improved, but manufacturing complexity increases
Solution Approach 1:
The patent changes the dielectric constant parameter by selecting materials with higher ε values (TiO2, ZrO2, HfO2, Al2O3) to increase capacitance and energy density. This material parameter change directly addresses the contradiction by improving energy storage capacity while the ALD process maintains manufacturability through precise thin-film control
Solution Approach 2:
The patent transitions from conventional planar capacitor structures to three-dimensional architectures with well-interconnected pores. This dimensional change increases the effective surface area for charge storage without proportionally increasing the footprint, thereby improving energy density while maintaining reasonable manufacturing complexity through scalable fabrication processes
2Reliability
If breakdown voltage is increased, then reliability is improved, but energy density decreases
Solution Approach 1:
The patent employs composite material structures combining high dielectric constant materials (TiO2, ZrO2, HfO2, Al2O3) with conductive electrodes in a metal-insulator-metal configuration. This composite approach enables simultaneous achievement of high breakdown voltage (reliability) and high energy density by optimizing the interface properties and material combinations
Solution Approach 2:
The patent applies different material properties to different regions of the capacitor structure. The dielectric layer uses high-k materials for voltage withstand, while the electrodes use highly conductive materials for charge storage. This local optimization of material properties resolves the contradiction between breakdown voltage and energy density
3Quantity of substance
If three-dimensional structures with well-interconnected pores are used, then capacitance increases, but manufacturing precision requirements increase
Solution Approach 1:
The patent utilizes porous three-dimensional structures with well-interconnected pores to dramatically increase the effective surface area for charge storage. The porous architecture provides numerous interfaces for capacitance enhancement while the ALD process naturally conforms to the complex 3D geometry, depositing uniform thin films within the pores without requiring excessive manufacturing precision
4Manufacturing precision
If plasma-assisted ALD is used to lower deposition temperature, then film quality improves, but process complexity increases
Solution Approach 1:
The patent employs plasma-assisted atomic layer deposition where the plasma phase enables low-temperature deposition of high-quality dielectric films. The plasma activation allows precursor reactions at reduced temperatures, producing uniform, pinhole-free films with excellent step coverage. This phase transition approach improves film quality while the modular ALD process maintains reasonable process complexity
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
Enhances capacitance and energy density, providing capacitors with improved breakdown voltage and scalability, enabling their use in battery replacement and renewable energy storage applications.
Implementation Method 1
Employing atomic layer deposition (ALD) to create thin-film capacitors with high dielectric constant materials like TiO2, ZrO2, and Al2O3
Implementation Method 2
using plasma-assisted ALD to lower deposition temperatures and improve film quality
Data Source
AI summary
A capacitor comprising a nanostructured conductive electrode, having a 3D surface area at least 10 times a planar area of the nanostructured conductive electrode, a counter-electrode, a dielectric layer disposed between the nanostructured conductive electrode and the counter-electrode conformed to the nanostructured conductive material, and a stabilizing film adjacent to the dielectric layer, comprising a plurality of different layers formed by atomic layer deposition, including an insulating layer type and a semiconducting layer type. The stabilizing layer increases a breakdown voltage of the capacitor, without significantly altering the capacitance. The stabilizing layer comprises doublets of atomic layer deposition films insulating and/or semiconductive films having closely matched Gibbs free energy.