3D MIM Capacitor Stack for High Density Energy Storage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current metal-insulator-metal (MIM) capacitors face challenges in miniaturization due to parasitic capacitances and limited capacitance density, which hinders further miniaturization of electronic devices, and existing discrete capacitor technologies struggle to meet the demand for lower height and cost-effectiveness.
Innovation Solution
A MIM energy storage device comprising vertically grown conductive nanostructures with a conformal layered stack of alternating electrode and conduction-controlling layers, optimized for increased energy storage capacity and reduced parasitic effects, using carbon nanofibers for enhanced conductivity and surface area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional MIM capacitor structures are used, then manufacturing is simpler, but capacitance density is limited and parasitic capacitances increase
Solution Approach 1:
The patent transitions from planar 2D capacitor structures to vertically grown 3D nanostructures (carbon nanofibers, nanotubes, or nanowires) that extend perpendicular to the substrate. This dimensional change increases the effective surface area and capacitance density without increasing the footprint area, directly resolving the contradiction between capacitance density and structure complexity.
Solution Approach 2:
The patent employs porous or hollow nanostructure geometries (such as carbon nanotubes with hollow cores or porous nanofiber networks) that provide high surface area-to-volume ratios. The porous structure increases the effective capacitance area while maintaining compact dimensions, thereby improving capacitance density without proportionally increasing structural complexity.
2Quantity of substance
If vertically grown nanostructures are used to increase capacitance density, then energy storage capacity improves, but parasitic capacitances from field oxide and random growth increase
Solution Approach 1:
The patent applies local quality by providing conformal coating of conduction-controlling layers (dielectric materials) that precisely follow the contours of each vertically grown nanostructure. This localized conformal coating ensures uniform dielectric properties at each contact point with the substrate, eliminating parasitic capacitances from field oxide while maintaining high energy storage capacity through the vertical nanostructure geometry.
Solution Approach 2:
The patent implements preliminary action by performing conformal dielectric coating and planarization processes before final device assembly and operation. The conduction-controlling layers are deposited conformally onto the nanostructures, and any non-conformal growth or parasitic elements are removed or planarized in advance, preventing parasitic capacitances from affecting device performance during operation.
3Reliability
If discrete capacitor components are used, then power management is improved, but device area and mass fraction increase
Solution Approach 1:
The patent merges the capacitor structure with the semiconductor device substrate by vertically growing nanostructures directly from the substrate surface and integrating conduction-controlling layers conformally. This merging eliminates the need for separate discrete capacitor components, reducing device area and mass fraction while maintaining effective power management functionality through the integrated high-density capacitor structure.
Solution Approach 2:
The patent implements multi-functionality by using the same vertically grown nanostructure array to serve both as the capacitor electrodes and as the structural framework for the entire device. The conduction-controlling layers provide both dielectric isolation and conductive pathways, enabling the structure to perform multiple functions (energy storage, electrical connection, and structural support) simultaneously, thereby reducing the need for additional separate components.
4Object-affected harmful factors
If more conduction-controlling layers are added to reduce parasitics, then parasitic effects decrease, but manufacturing complexity increases
Solution Approach 1:
The patent applies self-service by using conformal coating processes that automatically adapt to the three-dimensional geometry of the vertically grown nanostructures. The conduction-controlling layers deposit conformally onto the nanostructure surfaces without requiring manual alignment or complex patterning steps, enabling precise parasitic reduction while maintaining manufacturing simplicity through self-aligning conformal deposition processes.
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 solution achieves higher energy storage capacity per unit area, reduced parasitic effects, and cost-effectiveness, enabling compact and reliable energy storage components suitable for advanced electronic devices.
Implementation Method 1
each even-numbered electrode layer in the layered stack is electrically conductively connected to the nanostructures; and each odd-numbered electrode layer in the layered stack is electrically conductively connected to any other odd-numbered electrode layer in the layered stack
Implementation Method 2
a bottom conduction-controlling layer conformally coating each nanostructure in the plurality of electrically conductive vertical nanostructures; and a layered stack comprising alternating conduction-controlling layers and electrode layers conformally coating the bottom conduction-controlling layer
Implementation Method 3
using carbon nanofibers for enhanced conductivity and surface area
Data Source
AI summary
A MIM energy storage device comprising a bottom electrode; a plurality of electrically conductive vertical nanostructures; a bottom conduction-controlling layer conformally coating each nanostructure in the plurality of electrically conductive vertical nanostructures; and a layered stack of alternating conduction-controlling layers and electrode layers conformally coating the bottom conduction-controlling layer, the layered stack including at least a first odd-numbered electrode layer at a bottom of the layered stack, a first odd-numbered conduction-controlling layer directly on the first odd-numbered electrode layer, and a first even-numbered electrode layer directly on the first odd-numbered conduction-controlling layer. Each even-numbered electrode layer in the layered stack is electrically conductively connected to the bottom electrode; and each odd-numbered electrode layer in the layered stack is electrically conductively connected to any other odd-numbered electrode layer in the layered stack.