Gate Isolation Layer Structure for Fin Transistor Diffusion Breaks
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Solution Overview
Problem
As semiconductor devices become more densely integrated, it is challenging to achieve the required transistor performance due to difficulties in realizing effective gate isolation and field insulating layers, leading to issues with transistor performance and reliability.
Innovation Solution
A semiconductor device design incorporating a substrate with active fins, field insulating layers, gate lines, and a gate isolation layer, along with spacers, is implemented to enhance gate isolation and diffusion break regions, optimizing the structure for improved performance in both PMOS and NMOS regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional FET structures with silicon oxide and polycrystalline silicon are used, then manufacturing simplicity is maintained, but transistor performance deteriorates due to increased integration density
Solution Approach 1:
The gate isolation structure is segmented into multiple functional layers: a gate isolation layer formed at the interface between the gate electrode and active fin, and separate field insulating layers positioned between adjacent active fins. This segmentation allows each layer to be optimized independently for its specific function, improving overall transistor performance while managing the complexity through modular design.
Solution Approach 2:
The gate isolation layer acts as an intermediary element between the gate electrode and the active fin region. It provides essential functions including electrical isolation, mechanical stress management, and interface quality improvement, thereby enhancing transistor performance without requiring complete redesign of the entire gate structure.
2Reliability
If gate isolation and field insulating layers are simplified, then manufacturing ease is improved, but gate line deterioration occurs leading to reduced reliability
Solution Approach 1:
The gate isolation layer is formed preliminarily during the gate stack formation process, before subsequent processing steps. This preliminary action ensures proper gate line isolation and protection are established early, preventing gate line deterioration in later manufacturing steps while integrating smoothly into the overall fabrication sequence.
3Productivity
If integration density is increased, then productivity is improved, but transistor performance deteriorates due to insufficient gate isolation
Solution Approach 1:
Different regions of the device are assigned different insulating structures with optimized properties: the gate isolation layer provides localized isolation and stress control at the gate- fin interface, while field insulating layers provide broader isolation between adjacent fins. This local quality optimization enables higher integration density while maintaining transistor performance through region-specific structural tailoring.
Data Source
AI summary
A semiconductor device includes a substrate having a first region and a second region, first active fins that extend in a first direction in the first region, second active fins that extend in the first direction in the second region, a first field insulating layer between the first active fins and that extend in a second direction, a second field insulating layer between the second active fins and extending in the second direction, a gate line that extends in the second direction on the second field insulating layer, the gate line linearly along with the first field insulating layer, a gate isolation layer between the first field insulating layer and the gate line, and gate spacers that extend in the second direction, the gate spacers in contact with both sidewalls of each of the first field insulating layer, the gate line, and the gate isolation layer.