Fin Separation Insulating Structure for IC Short Prevention
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Solution Overview
Problem
There is a need for an integrated circuit (IC) device with fin field effect transistors that prevents shorts between adjacent conductive regions, which is challenging due to the downscaled nature of semiconductor devices requiring both fast operation speed and operational accuracy.
Innovation Solution
The IC device incorporates fin-shaped active areas with a fin separation insulating structure, including a lower insulating pattern and an upper insulating pattern with a convex rounded top surface, to prevent shorts between adjacent conductive regions. This structure extends in a direction intersecting the fin-shaped active areas, providing a wider upper insulating pattern that covers the chamfered corners and source/drain areas, ensuring a stable channel region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the transistor size is reduced to achieve downscaling, then the operation speed and integration density are improved, but the risk of shorts between adjacent conductive regions increases
Solution Approach 1:
The fin separation insulating structure is divided into two distinct patterns: a lower insulating pattern and an upper insulating pattern. This segmentation allows each layer to perform its specific function - the lower pattern provides base separation while the upper pattern extends to cover chamfered corners and prevent shorts, thereby maintaining reliability during downscaling
Solution Approach 2:
The insulating structure extends in the vertical dimension with the upper insulating pattern rising above the top surface of the fin-shaped active area. This vertical extension into the third dimension provides additional protection against shorts between adjacent conductive regions without occupying more horizontal space, enabling continued downscaling
2Ease of manufacture
If a simple insulating structure is used, then the manufacturing process is simplified, but it cannot effectively prevent shorts between adjacent conductive regions
Solution Approach 1:
The insulating structure is segmented into lower and upper patterns that can be formed using standard semiconductor manufacturing processes. Each layer is deposited and patterned separately, allowing for precise control and coverage of critical areas while maintaining compatibility with existing fabrication workflows
Solution Approach 2:
The upper insulating pattern is strategically positioned to cover only the chamfered corners and areas where shorts are most likely to occur. This localized approach provides enhanced protection precisely where needed without requiring complex structures throughout the entire device, balancing manufacturing simplicity with effective short prevention
3Productivity
If the fin separation area is reduced to increase transistor density, then the integration density is improved, but the stability of the channel region deteriorates
Solution Approach 1:
The upper insulating pattern extends vertically above the fin-shaped active area top surface, providing channel region stability in the vertical dimension. This allows the horizontal fin separation area to be minimized for higher density while the vertical extension maintains electrical isolation and structural stability of the channel region
Data Source
AI summary
An integrated circuit (IC) device includes a pair of fin-shaped active areas that are adjacent to each other with a fin separation area therebetween, the pair of fin-shaped active areas extend in a line, and a fin separation insulating structure in the fin separation area, wherein the pair of fin-shaped active areas includes a first fin-shaped active area having a first corner defining part of the fin separation area, and wherein the fin separation insulating structure includes a lower insulating pattern that covers sidewalls of the pair of fin-shaped active areas, and an upper insulating pattern on the lower insulating pattern to cover at least part of the first corner, the upper insulating pattern having a top surface at a level higher than a top surface of each of the pair of fin-shaped active areas.