3D Capacitor Structure for DRAM Density and Performance
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Solution Overview
Problem
As integrated circuits (IC) continue to evolve, there is a persistent need for higher device density and operation speed, particularly in DRAMs, which requires the miniaturization of components like capacitors and transistors, posing challenges in maintaining performance and efficiency.
Innovation Solution
The semiconductor device design incorporates a three-dimensional structure for capacitors with increased vertical surface area, along with specific layering and dielectric materials to optimize the arrangement and connectivity of components, such as bit line stacks and gate features, to enhance miniaturization and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If capacitors are miniaturized to increase device density, then horizontal dimensions are reduced, but performance and efficiency may deteriorate
Solution Approach 1:
The patent transitions capacitor design from two-dimensional planar structures to three-dimensional vertical structures. By increasing the vertical surface area through stacked configurations and vertical electrode arrangements, the capacitor maintains adequate capacitance values while reducing horizontal footprint, thereby enabling higher device density without sacrificing performance
Solution Approach 2:
The patent implements nested capacitor structures where electrodes and dielectric layers are stacked vertically within a compact volume. Multiple capacitor elements are arranged in three-dimensional configurations, allowing one capacitor structure to be contained within or adjacent to another, maximizing space utilization and achieving high device density
2Area of stationary object
If three-dimensional capacitor structures are implemented to increase vertical surface area, then horizontal dimensions are reduced, but manufacturing complexity increases
Solution Approach 1:
The patent divides the capacitor structure into discrete, modular components including separate electrode layers, dielectric layers, and spacer elements. Each layer is formed through independent deposition and patterning steps, allowing complex three-dimensional structures to be built from simpler, standardized building blocks that can be manufactured using existing semiconductor fabrication processes
Solution Approach 2:
The patent employs preliminary formation of mandrel structures, spacers, and seed layers that guide subsequent deposition steps. These preliminary structures are removed or transformed in later steps, enabling precise control over the final three-dimensional capacitor geometry while using standard fabrication techniques
Data Source
AI summary
A semiconductor device includes a substrate, a gate feature, a gate spacer, and a dielectric layer. The gate feature is above the substrate and includes a gate electrode. The gate spacer is on a sidewall of the gate feature. The dielectric layer is in contact with the gate spacer and has a larger thickness than the gate electrode.