Semiconductor Gate Separation Layout for Finer Pattern Integration
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Solution Overview
Problem
The increasing demand for high-performance, high-speed, and multifunctional semiconductor devices necessitates improved integration, which requires finer patterns and narrower separation distances, posing challenges in manufacturing.
Innovation Solution
A semiconductor device design featuring parallel active regions, isolation layers, line structures, gate structures, and insulating separation patterns with specific side profiles to enhance integration and contact plug placement, allowing for efficient source/drain region connections and improved transistor regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the degree of integration is increased to meet high-performance demands, then device performance and functionality are improved, but manufacturing precision requirements worsen due to finer patterns and narrower separation distances
Solution Approach 1:
The isolation layer is segmented into multiple regions with different thicknesses (first thickness region and second thickness region), allowing different sections to serve different functional purposes. This segmentation enables the structure to accommodate finer patterns while maintaining manufacturability by providing appropriate isolation in critical areas.
Solution Approach 2:
The patent applies local quality by creating non-uniform isolation layer thickness across different regions. The first thickness region provides enhanced isolation where needed, while the second thickness region maintains standard isolation, allowing the device to achieve high integration without uniformly demanding extreme manufacturing precision across the entire structure.
2Quantity of substance
If finer patterns are implemented to increase integration density, then device capacity is improved, but manufacturing complexity and difficulty worsen
Solution Approach 1:
The isolation layer is prepared in advance with predetermined thickness variations before the fine pattern formation steps. This preliminary action of creating the multi-region isolation structure simplifies subsequent manufacturing steps by providing a ready-made framework that guides fine pattern deposition, reducing the overall manufacturing complexity despite the high integration density.
Solution Approach 2:
The patent introduces vertical dimensionality variation in the isolation layer thickness to solve the horizontal density problem. By varying the isolation layer thickness in the vertical dimension, the patent enables higher horizontal integration density without proportionally increasing manufacturing complexity, as the thickness variation can be achieved through standard deposition techniques.
3Area of stationary object
If narrower separation distances are used to increase integration, then device compactness is improved, but reliability worsens due to increased risk of defects and interference
Solution Approach 1:
The isolation layer provides locally optimized quality by having different thicknesses in different regions. The first thickness region provides enhanced isolation and defect resistance where devices are closely spaced, while the second thickness region maintains adequate isolation where spacing is larger, thereby maintaining reliability across the compact device structure.
Solution Approach 2:
The thicker first thickness region of the isolation layer acts as a cushioning layer that prevents defect propagation and electrical interference between closely spaced active regions. This beforehand cushioning is built into the structure during fabrication, providing built-in protection against reliability issues that would otherwise arise from narrow separation distances.
Data Source
AI summary
A semiconductor device includes first and second active regions parallel to each other and respectively extending in a first direction, an isolation layer between the first and second active regions, a first line structure and a second line structure overlapping the first and second active regions and the isolation layer, parallel to each other, and extending in a second direction, a first source/drain region on the first active region, and a second source/drain region on the second active region. The first line structure includes a first gate structure, a second gate structure, and a first insulating separation pattern between the first and second gate structures. The second line structure includes a third gate structure, a fourth gate structure, and a second insulating separation pattern between the third and fourth gate structures. The first and second insulating separation patterns are spaced apart from each other. The first insulating separation pattern has first and second side surfaces opposing each other, and third and fourth side surfaces opposing each other. At least one of the first and second side surfaces and at least one of the third and fourth side surfaces have different side profiles.