Capacitor Electrode Structure for High Density and Structural Integrity
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Solution Overview
Problem
As integrated circuit density increases, capacitors face challenges in maintaining high storage capacitance due to reduced horizontal dimensions, leading to structural integrity issues and increased electrical resistance, which can degrade read/write characteristics.
Innovation Solution
The design includes an elevationally inner capacitor electrode comprising a hollow and a non-hollow longitudinally-elongated conductive cylinder-like portion, with the non-hollow portion radially extending along the side surfaces of the hollow portion, and a capacitor insulator between the inner and outer electrodes, enhancing structural integrity and capacitance while minimizing electrical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the horizontal dimension of capacitors is reduced to increase density, then the storage capacitance decreases, but the structural integrity and electrical resistance worsen
Solution Approach 1:
The patent transitions from planar capacitor structures to three-dimensional structures by forming electrodes that extend vertically into openings in the support material. The inner electrode comprises multiple portions (first, second, and third portions) at different elevations, creating a vertical dimension that increases capacitance without reducing horizontal footprint. This dimensional change allows maintaining density while improving structural integrity through the opening walls that support the vertical electrode structures.
Solution Approach 2:
The patent implements a nested electrode configuration where an inner electrode is positioned within an opening formed in the support material, and an outer electrode surrounds the inner electrode. The inner electrode comprises multiple nested portions (first portion, second portion, third portion) at different elevations within the same vertical space. This nesting approach maximizes capacitive surface area within a compact volume, increasing density while maintaining structural support from the opening walls.
2Productivity
If the horizontal dimension of capacitors is reduced to increase density, then the storage capacitance decreases, but the electrical resistance increases
Solution Approach 1:
The patent introduces vertical dimensionality with electrodes extending through multiple elevation levels (first, second, and third portions of the inner electrode). This vertical arrangement creates multiple conductive pathways and increases the effective cross-sectional area for current flow, thereby reducing electrical resistance. The conductive material fills the vertical space within openings, providing redundant conduction paths that mitigate resistance increases associated with horizontal dimension reduction.
Solution Approach 2:
The patent employs composite electrode structures comprising multiple conductive material portions (inner electrode portions and outer electrode portions) with different spatial orientations and elevations. The inner electrode comprises first, second, and third portions that may have different material compositions or structures, creating a composite conductive system. This composite approach optimizes electrical resistance by combining materials with complementary conductive properties while maintaining the high-density vertical structure.
3Productivity
If the lateral thickness of capacitor electrodes is reduced to pack capacitors closer, then the capacitance surface area decreases, but the structural integrity worsens
Solution Approach 1:
The patent compensates for reduced lateral electrode thickness by extending electrodes vertically through multiple elevation levels. The inner electrode comprises first, second, and third portions positioned at different heights within the opening, creating a vertical structure that maintains structural integrity through the confining opening walls. This vertical extension provides sufficient capacitive surface area without requiring increased lateral dimensions, enabling tighter horizontal packing while maintaining strength through the opening support structure.
4Productivity
If the lateral thickness of capacitor electrodes is reduced to pack capacitors closer, then the capacitance surface area decreases, but the capacitance is lost
Solution Approach 1:
The patent implements a nested electrode configuration where the inner electrode (with its multiple portions) is positioned within an opening, and the outer electrode surrounds it. This nesting creates multiple capacitive interfaces: between the inner electrode portions and the support material opening walls, and between the inner and outer electrodes. The cumulative surface area of these nested interfaces compensates for the reduced lateral thickness, maintaining total capacitance while enabling higher packing density through vertical space utilization.
Data Source
AI summary
A capacitor includes an elevationally inner capacitor electrode, an elevationally outer capacitor electrode, and capacitor insulator between the elevationally inner and outer capacitor electrodes. The elevationally inner capacitor electrode comprises a hollow longitudinally-elongated conductive cylinder-like portion and a non-hollow longitudinally-elongated conductive cylinder-like portion electrically coupled with the hollow cylinder-like portion. The non-hollow cylinder-like portion is radially of and extends longitudinally along a longitudinal side surface of the hollow cylinder-like portion. Additional embodiments and aspects are disclosed.