Segmented Gate Structure With Separation Patterns for MOSFET Scaling
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Solution Overview
Problem
As semiconductor devices are scaled down, the operating characteristics of MOSFETs deteriorate, leading to defects and suboptimal electrical performance due to integration limitations.
Innovation Solution
The implementation of a semiconductor device design featuring gate structures with separation patterns that penetrate neighboring gate structures, aligned with each other, and a lower dielectric layer, which helps in preventing defects and improving electrical characteristics by facilitating better contact formation and pattern integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If MOSFETs are scaled down to maintain integration, then device density increases, but operating characteristics deteriorate and defects occur
Solution Approach 1:
The gate structure is divided into multiple gates with separation patterns between them. This segmentation allows each gate to be independently controlled and optimized, preventing the deterioration of operating characteristics while maintaining high device density through compact arrangement of multiple segmented gates.
Solution Approach 2:
The invention introduces vertical separation patterns that extend beneath the gate structures, creating a three-dimensional architecture. This dimensional change enables better isolation and control of individual gates while maintaining horizontal integration density, thus improving operating characteristics without sacrificing productivity.
2Area of stationary object
If gate structures are integrated closely to improve density, then area utilization increases, but pattern defects occur
Solution Approach 1:
Separation patterns are introduced as intermediary structures between adjacent gate structures. These patterns provide physical and electrical isolation, preventing pattern defects and interference between closely integrated gates while maintaining high area utilization through optimized spacing.
Solution Approach 2:
The separation patterns are strategically positioned only where needed between specific gate structures, providing localized isolation without affecting overall device density. This local quality approach maintains manufacturing precision by addressing pattern defects only at critical interfaces while preserving area utilization elsewhere.
3Reliability
If separation patterns are added to prevent defects, then reliability improves, but device complexity increases
Solution Approach 1:
The separation patterns are designed with varying depths and configurations that can be dynamically adjusted during fabrication. This allows the same basic separation pattern structure to serve multiple functions at different stages, improving contact formation quality without proportionally increasing overall device complexity.
Solution Approach 2:
The separation patterns serve multiple functions simultaneously: they provide electrical isolation between gates, define contact regions, and serve as etch stop layers. This multi-functionality improves reliability in contact formation while minimizing the increase in device complexity by using a single structural element for multiple purposes.
Data Source
AI summary
Disclosed are semiconductor devices and methods of fabricating the same. The semiconductor device includes a plurality of gate structures that are spaced apart from each other in a first direction on a substrate and extend in a second direction intersecting the first direction, and a plurality of separation patterns penetrating immediately neighboring ones of the plurality of gate structures, respectively. Each of the plurality of separation patterns separates a corresponding one of the neighboring gate structures into a pair of gate structures that are spaced apart from each other in the second direction. The plurality of separation patterns are spaced apart from and aligned with each other along the first direction.