Gate Line Isolation Structure for Semiconductor Device
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Solution Overview
Problem
The limitation in photolithography resolution for semiconductor devices restricts the formation of patterns with fine pitches, making it challenging to design integrated circuit devices with optimal gate line structures for varying transistor channel lengths.
Innovation Solution
The integrated circuit device employs a differentiated gate line isolation structure for each area, featuring gate lines with varying widths and curvatures, and isolation layers to accommodate different transistor channel lengths and densities, allowing for tailored isolation methods based on the process margin in each area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a uniform gate line isolation structure is used across the entire device, then the manufacturing process is simple, but the device performance degrades due to inability to accommodate varying transistor channel lengths and densities
Solution Approach 1:
The device is divided into first and second regions with different transistor characteristics. Each region employs a tailored gate line isolation structure: the first region uses a first gate isolation layer contacting the gate line, while the second region uses a second gate isolation layer spaced apart from the gate line. This segmentation allows optimization for different channel lengths and densities without requiring a completely different manufacturing process.
Solution Approach 2:
Different isolation structures are applied to different regions based on their specific requirements. The first region with longer channel lengths uses one isolation approach, while the second region with shorter channel lengths uses another. This local quality approach ensures each region receives the appropriate isolation structure for its transistor characteristics, improving overall device performance.
2Manufacturing precision
If photolithography is used for pattern formation, then the manufacturing process is straightforward, but the resolution limitation prevents formation of fine pitch patterns
Solution Approach 1:
The patent introduces a vertical dimension to the isolation structure by using gate isolation layers positioned at different heights and with different contact configurations. This dimensional approach allows fine pitch patterns to be formed in the horizontal plane while maintaining manufacturability through vertical structuring, effectively bypassing the photolithography resolution limit for horizontal feature sizes.
3Reliability
If gate isolation layer contacts the gate line in all regions, then the isolation is effective, but the device performance degrades in regions with different transistor characteristics
Solution Approach 1:
The isolation structure is made dynamic by allowing the gate isolation layer to assume different spatial relationships with the gate line depending on the region. In the first region, the isolation layer contacts the gate line, while in the second region, it is spaced apart. This dynamic configuration enables the same isolation layer structure to adapt to different transistor characteristics across the device.
Data Source
AI summary
An integrated circuit device includes an active area extending in a first direction on a substrate and a gate line extending in a second direction intersecting with the first direction to intersect with the active area. The gate line comprises a first sidewall and a second sidewall opposite to each other. The first sidewall has a convex shape. The second sidewall has a concave shape.