Gate Capping Pattern Structure for Short-Circuit Isolation
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Solution Overview
Problem
Current semiconductor devices face challenges in achieving improved reliability and integration density due to limitations in capping pattern design and fabrication methods, which affect the performance and yield of semiconductor devices.
Innovation Solution
The semiconductor device incorporates a substrate with an active pattern, gate patterns, spacer patterns, capping patterns, and insulating patterns, where the capping patterns have a unique top surface, side surface, and rounded edge configuration, and an interlayer insulating layer, allowing for improved coverage and thickness variations to enhance device reliability and integration density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional capping pattern is used on gate structures, then fabrication is simpler, but device reliability deteriorates due to insufficient coverage and potential electric short circuits
Solution Approach 1:
The capping pattern is divided into multiple segments including a first capping pattern on the gate pattern, a second capping pattern on spacer patterns, and an insulating pattern connecting them. This segmentation allows each part to serve specific functions: the first capping pattern covers the gate electrode, the second capping pattern covers the spacer, and the insulating pattern provides electrical isolation, collectively improving reliability without requiring a single complex capping structure
Solution Approach 2:
An insulating pattern is introduced as an intermediary element between the first capping pattern and the second capping pattern. This insulating pattern extends from the first capping pattern to the second capping pattern, providing electrical isolation and preventing short circuits while connecting the two capping patterns into a unified structure that enhances overall device reliability
2Productivity
If integration density is increased, then productivity improves, but manufacturing precision deteriorates due to difficulties in forming precise contact patterns
Solution Approach 1:
The capping patterns and insulating patterns are formed in advance before contact hole formation. The first capping pattern is formed on the gate pattern, followed by spacer patterns, then the second capping pattern on the spacers, and finally the insulating pattern connecting them. This preliminary formation of protective and isolating structures creates well-defined landmarks and controlled interfaces that guide subsequent contact hole formation, enabling precise contact patterns even at high integration densities
Solution Approach 2:
Different regions of the structure are assigned different properties: the first capping pattern provides coverage on the gate, the spacer patterns provide structural support and spacing, the second capping pattern covers the spacers, and the insulating pattern provides electrical isolation. This local differentiation of properties allows each region to be optimized for its specific function, facilitating precise contact pattern formation in high-density configurations
3Reliability
If capping patterns are added to improve reliability, then device performance improves, but fabrication complexity increases
Solution Approach 1:
The first capping pattern, second capping pattern, and insulating pattern are merged into an integrated multi-layer structure. The insulating pattern extends from the first capping pattern to the second capping pattern, creating a unified configuration that provides both coverage and electrical isolation. This merging allows the structure to achieve improved reliability through multiple functional layers while being fabricated as an integrated unit, reducing the number of separate fabrication steps compared to implementing equivalent reliability improvements through multiple discrete components
Data Source
AI summary
A semiconductor device is disclosed. The semiconductor device may include a semiconductor substrate including a protruding active pattern, a first gate pattern provided on the active pattern and extended to cross the active pattern, a first capping pattern provided on a top surface of the first gate pattern, the first capping pattern having a top surface, a side surface, and a rounded edge, and a first insulating pattern covering the side surface and the edge of the first capping pattern. A thickness of the first insulating pattern on the edge of the first capping pattern is different from a thickness of the first insulating pattern on outer side surfaces of the spacer patterns.