FinFET Filler Cell Stress Control for Transistor Speed
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Solution Overview
Problem
As semiconductor devices become highly integrated, it is challenging to achieve the required transistor performance, and there is a trade-off between high-performance and low-power goals, making it difficult to control the speed of cells like FinFETs effectively.
Innovation Solution
The integration of a filler cell with specific insulating structures and diffusion regions adjacent to standard cells, which applies compressive or tensile stress to FinFET regions, allowing for selective speed control of transistors by varying the width and arrangement of insulating structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If semiconductor devices are highly integrated, then device density increases, but transistor performance becomes difficult to achieve
Solution Approach 1:
The patent applies different stress conditions to different regions of the transistor channel by introducing filler cells with specific insulating structures adjacent to the standard cell. The first and second regions of the filler cell create localized stress fields that modify carrier mobility in specific areas, allowing high-density integration while maintaining performance through spatially varying material properties.
2Speed
If transistor speed is increased, then performance improves, but power consumption increases
Solution Approach 1:
The filler cell structure creates localized stress regions that enhance carrier mobility only where needed, rather than uniformly increasing speed across the entire device. This allows selective speed enhancement in critical paths while maintaining lower power consumption in non-critical areas, resolving the trade-off between speed and power.
3Speed
If cell speed is controlled, then performance optimization is achieved, but device complexity increases
Solution Approach 1:
The filler cell acts as an intermediary structure between standard cells, introducing stress-modifying insulating structures that control cell speed without requiring complex internal modifications to the standard cell design. This mediator approach enables performance optimization while keeping the base standard cell structure simple and reusable.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables selective speed control of transistors, improving performance by adjusting threshold voltages and enhancing the speed of FinFET regions, while ensuring design autonomy and applicability at various stages of integrated circuit design.
Implementation Method 1
applies compressive or tensile stress to FinFET regions, allowing for selective speed control of transistors by varying the width and arrangement of insulating structures
Data Source
AI summary
Provided is an integrated circuit. The integrated circuit includes: a first standard cell comprising a P-type Fin Field Effect Transistor (FinFET) region and an N-type FinFET region; and a filler cell adjacent to the first standard cell in a first direction and including a first region and a second region arranged in a second direction perpendicular to the first direction, wherein the first region includes a plurality of first insulating structures spaced apart from each other in the first direction, and the second region includes a second insulating structure having a width greater than that of at least one of the plurality of first insulating structures in the first direction, and one of the first region and the second region is arranged adjacent to the P-type FinFET region in the first direction and the other is arranged adjacent to the N-type FinFET region in the first direction.