Capacitor Electrode Lateral Support for Stability
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Solution Overview
Problem
Capacitor electrodes in deep openings are prone to toppling during fabrication and handling due to their tall and narrow structure, leading to instability and potential damage.
Innovation Solution
The use of a support material, such as dielectric materials like silicon dioxide or silicon nitride, that laterally supports the capacitor electrodes, preventing them from tipping or moving by contacting the tip ends of laterally projecting conductive materials, thereby enhancing stability and capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If capacitor electrodes are made tall and narrow to increase capacitance, then capacitance increases, but stability deteriorates causing toppling during fabrication and handling
Solution Approach 1:
The invention transitions from a purely vertical electrode structure to one that incorporates lateral support elements. The support material extends laterally from the opening sidewalls to contact and stabilize the electrode, adding a horizontal dimension to the structure that prevents toppling while maintaining the vertical height needed for capacitance.
Solution Approach 2:
The support material acts as an intermediary between the electrode and the opening structure. It provides lateral contact and stabilization to the electrode without directly becoming part of the electrode itself, allowing the electrode to maintain its tall, narrow configuration for high capacitance while being stabilized by the intermediate support structure.
2Quantity of substance
If most support material is etched away to enable radial sidewall surfaces for increased capacitance, then capacitance increases, but ease of manufacture deteriorates due to electrode toppling
Solution Approach 1:
The support material is prepared in advance with lateral extensions that will contact and stabilize the electrode during subsequent fabrication steps. This preliminary configuration of the support material prevents toppling during etching, transport, and deposition operations before the electrode is fully formed and stabilized.
Solution Approach 2:
The support material serves as a temporary intermediary structure that facilitates the fabrication process. It provides the necessary mechanical support during manufacturing operations, allowing the electrode to be formed without toppling, and can be selectively removed or retained depending on the final design requirements.
3Quantity of substance
If capacitor electrodes are made tall and narrow to increase capacitance, then capacitance increases, but reliability deteriorates due to toppling during transport and deposition
Solution Approach 1:
By adding lateral support elements in the horizontal dimension, the invention stabilizes the vertically-oriented tall electrode structure. This dimensional addition prevents toppling during transport and deposition operations, ensuring the electrode maintains its high-capacitance geometry throughout fabrication and operation.
Solution Approach 2:
The lateral support material is positioned beforehand to contact and stabilize the electrode before potential toppling can occur during transport or deposition. This preemptive support structure cushions against mechanical disturbances that would otherwise cause the tall, narrow electrode to topple and fail.
Data Source
AI summary
A device includes a capacitor that has first and second electrodes having a capacitor insulator there-between. The first electrode is elongated and extends elevationally. The first electrode has elevationally-extending first conductive material and has second conductive material that projects laterally outward from an elevationally-extending part of the first conductive material. The laterally-projecting second conductive material has a vertical thickness that is less than that of the elevationally-extending first conductive material. Support material laterally supports the capacitor and contacts a tip end of the laterally-projecting second conductive material.