Semiconductor FinFET Gate Isolation via Dummy Fin and Capping Pattern
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current semiconductor devices face challenges in scaling and reliability due to the complexity of multi-gate transistor structures, particularly in effectively separating gate structures and maintaining electrical isolation during the fabrication process.
Innovation Solution
The semiconductor device incorporates a dummy fin type pattern and a capping pattern with a separation part that electrically separates the gate structures, along with an insulating liner and interlayer insulating film, to enhance reliability and scalability by minimizing damage during the gate cut process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a multi-gate transistor structure is used to increase integration density, then scaling capability is improved, but device complexity increases
Solution Approach 1:
The gate structure is divided into multiple gates (first gate structure and second gate structure) that are electrically separated by the dummy fin type pattern and capping pattern with separation part. This segmentation allows independent control of each gate while maintaining high integration density through the three-dimensional multi-gate configuration.
2Productivity
If gate structures are closely spaced to increase density, then integration density is improved, but electrical isolation becomes difficult to maintain
Solution Approach 1:
A dummy fin type pattern with a capping pattern including a separation part is introduced as an intermediary structure between the first gate structure and second gate structure. This intermediary provides effective electrical isolation through the insulating liner and separation part, preventing electrical interference while allowing the gates to be closely spaced for high density.
3Reliability
If gate cut is performed to separate gate structures, then electrical separation is improved, but damage to surrounding structures increases
Solution Approach 1:
The dummy fin type pattern and capping pattern with separation part are formed in advance before the gate cut process. This preliminary action creates a pre-defined separation path that guides the gate cut, ensuring clean separation of gate structures while minimizing damage to surrounding structures such as the insulating liner and interlayer insulating film.
4Reliability
If insulating liner is extended along trench sidewalls to enhance isolation, then electrical isolation is improved, but manufacturing complexity increases
Solution Approach 1:
The insulating liner serves multiple functions: it provides electrical isolation between the gate structures and the dummy fin type pattern, lines the trench sidewalls to define the separation geometry, and protects underlying structures during subsequent processing steps. This multi-functionality achieves enhanced isolation without proportionally increasing manufacturing complexity.
Data Source
AI summary
A semiconductor device including a first fin type pattern and a second fin type pattern which protrude from a substrate and are spaced apart from each other to extend in a first direction, a dummy fin type pattern protruding from the substrate between the first fin type pattern and the second fin type pattern, a first gate structure extending in a second direction intersecting with the first direction, on the first fin type pattern, a second gate structure extending in the second direction, on the second fin type pattern, and a capping pattern extending in the second direction, on the first gate structure and the second gate structure, wherein the capping pattern includes a separation part which is in contact with an upper surface of the dummy fin type pattern, and the dummy fin type pattern and the separation part separate the first gate structure and the second gate structure.