Embedded Electrode Capacitor Structures for IC Scaling
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Solution Overview
Problem
Traditional capacitor designs face scaling issues such as increased resistance and reduced capacitance due to size reduction, leading to increased fabrication costs and reduced yield, especially in integrated circuits where smaller dimensions are required.
Innovation Solution
A method for fabricating a capacitor structure with first electrodes partially embedded within a second electrode, where the first electrodes are covered by a dielectric material and the second electrode is formed around them, physically separated by the dielectric, allowing for increased capacitance and reduced resistance while minimizing photolithographic mask steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the size of capacitor is reduced to increase density, then the area occupied by capacitor is reduced, but the resistance increases and capacitance decreases
Solution Approach 1:
The patent transitions from traditional planar capacitor geometry to a three-dimensional embedded structure where the first electrode is surrounded by the second electrode in multiple dimensions. This vertical and radial embedding approach increases the effective electrode surface area and dielectric interface without proportionally increasing the footprint area, thereby maintaining lower resistance while achieving higher density.
Solution Approach 2:
The capacitor structure implements nesting by placing the first electrode inside the second electrode, with the dielectric material surrounding the first electrode. This nested configuration maximizes the use of available space, increases the effective capacitance through greater electrode surface area, and reduces resistance by providing multiple conduction pathways, all within a compact footprint.
2Area of stationary object
If the size of capacitor is reduced to increase density, then the area occupied by capacitor is reduced, but the capacitance decreases
Solution Approach 1:
By moving from two-dimensional planar electrodes to three-dimensional embedded electrodes, the patent increases the effective surface area of the electrodes and the volume of the dielectric material. The first electrode is surrounded by the second electrode radially and vertically, creating multiple interfaces that contribute to higher capacitance within a smaller footprint area.
Solution Approach 2:
The patent employs composite material structures with the first electrode, second electrode, and dielectric material forming a multi-material system. The specific combination and arrangement of these materials optimize the capacitance by maximizing the dielectric volume and electrode surface area, achieving higher capacitance density without increasing the overall capacitor footprint.
3Ease of manufacture
If traditional capacitor designs are used, then fabrication process is simpler, but fabrication yield is reduced due to scaling problems
Solution Approach 1:
The patent merges the formation of the embedded electrode structure with existing fabrication processes. The first electrode is formed within the dielectric material using standard deposition and patterning techniques, and the second electrode is subsequently formed to surround the first electrode. This integrated approach achieves the complex three-dimensional structure without requiring separate, defect-prone fabrication steps, thereby maintaining fabrication simplicity while improving yield.
4Reliability
If MIM or MOM capacitor designs are used to address scaling problems, then capacitance and resistance are improved, but device complexity and fabrication cost increase
Solution Approach 1:
The patent achieves the performance benefits of complex MIM or MOM structures by implementing a three-dimensional embedded geometry. The first electrode is surrounded by the second electrode in multiple dimensions, creating effective multiple interfaces and dielectric layers without requiring the complex stacked or interdigitated geometries of traditional MIM/MOM capacitors. This simplifies the device structure while maintaining improved capacitance and resistance characteristics.
Data Source
AI summary
Capacitor structures having first electrodes at least partially embedded within a second electrode, and fabrication methods are presented. The methods include, for instance: providing the first electrodes at least partially within an insulator layer, the first electrodes comprising exposed portions; covering exposed portions of the first electrodes with a dielectric material; and forming the second electrode at least partially around the dielectric covered portions of the first electrodes, the second electrode being physically separated from the first electrodes by the dielectric material. In one embodiment, a method further includes exposing further portions of the first electrodes; and providing a contact structure in electrical contact with the further exposed portions of the first electrodes. In another embodiment, some of the first electrodes are aligned substantially parallel to a first direction and other of the first electrodes are aligned substantially parallel to a second direction, the first and second directions being different directions.