Capacitor Electrode Supporter Curvature for Misalignment Margin
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Solution Overview
Problem
As semiconductor devices strive for higher integration density to meet the demands of high-speed and low-power electronic devices, they often face challenges in maintaining electrical characteristics and production yield, leading to potential deterioration in performance.
Innovation Solution
The semiconductor device incorporates a capacitor structure with a unique supporter design featuring curved sidewalls that surround an intervening electrode portion, enhancing the misalignment margin and preventing bridge disturbances between electrodes, while supporting lower electrodes with a capacitor insulating layer, thereby improving electrical connections and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If integration density of semiconductor devices is increased, then productivity and device miniaturization are improved, but electrical characteristics and production yield deteriorate
Solution Approach 1:
The supporter structure employs curved sidewalls instead of straight vertical walls, creating a tapered configuration that expands toward the top. This curvature prevents bridge disturbances between adjacent lower electrodes while maintaining compact footprint, thus improving reliability without sacrificing integration density
Solution Approach 2:
The capacitor structure is divided into distinct functional segments: lower electrodes, a supporter with curved sidewalls, a capacitor insulating layer, and an upper electrode. This segmentation allows each component to be optimized independently - the supporter curvature addresses bridge disturbance prevention while the insulating layer ensures electrical isolation, collectively improving electrical characteristics
2Volume of moving object
If integration density is increased, then device size is reduced, but misalignment between components occurs
Solution Approach 1:
The curved sidewalls of the supporter create a tapered geometry that provides increasing lateral separation between adjacent lower electrodes from bottom to top. This geometric design inherently compensates for alignment variations that occur during fabrication, maintaining proper spacing and preventing misalignment issues even as device size is reduced for higher integration density
Solution Approach 2:
The supporter structure exhibits varying properties at different heights - narrower at the bottom and wider at the top. This local variation in geometry is strategically designed to provide adequate clearance at critical interfaces while maintaining compact overall dimensions, thus preventing misalignment without increasing device footprint
Data Source
AI summary
A semiconductor device may include an active pattern, a capacitor contact structure electrically connected to the active pattern, and a capacitor structure electrically connected to the capacitor contact structure. The capacitor structure may include a first lower electrode and a second lower electrode that are adjacent to each other, a supporter supporting the first and second lower electrodes, a capacitor insulating layer covering the first and second lower electrodes, and an upper electrode on the capacitor insulating layer. The supporter may include a first supporter curved sidewall connected to the first lower electrode and the second lower electrode, and the upper electrode may include an intervening electrode portion enclosed by the supporter. The first supporter curved sidewall may be convex toward the intervening electrode portion.