Multi-Region Gate Stack Layout for Mixed Threshold Voltage Transistors
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Solution Overview
Problem
The increasing demand for high-performance, high-speed, and multifunctional semiconductor devices requires improved electrical characteristics, particularly in transistor design, where existing technologies face challenges in scaling down transistors while maintaining effective operating voltages and integration.
Innovation Solution
The semiconductor device incorporates a substrate with multiple regions, each featuring distinct gate structures composed of specific dielectric and conductive layers, including different elements and materials in the gate dielectric layers to achieve varying threshold voltages and operating voltages, allowing for diverse transistor configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transistors are scaled down to increase integration density, then device integration increases, but maintaining effective operating voltages and electrical characteristics becomes difficult
Solution Approach 1:
The patent applies local quality by forming different gate dielectric layers with different materials and properties in different regions of the semiconductor device. Specifically, a first gate dielectric layer with first electrical properties is formed in a first region, while a second gate dielectric layer with second electrical properties is formed in a second region, allowing each region to be optimized for its specific function while maintaining overall device integration
Solution Approach 2:
The patent segments the gate dielectric structure into multiple distinct layers (first gate dielectric layer, second gate dielectric layer, third gate dielectric layer) with different materials and properties. This segmentation allows independent optimization of each layer's thickness and composition to achieve desired threshold voltages and operating characteristics for different transistor types in the same device
2Adaptability or versatility
If multiple transistor types with different voltage requirements are integrated, then device functionality increases, but device complexity increases
Solution Approach 1:
The patent implements local quality by assigning different gate dielectric material compositions to different functional regions. The first gate dielectric layer contains a first material with specific dielectric properties for low-voltage operation, while the second gate dielectric layer contains a second material with different properties for high-voltage operation, enabling multifunctionality without requiring entirely separate device structures
Solution Approach 2:
The patent achieves universality by creating a unified semiconductor device structure that can perform multiple functions through regional variations in gate dielectric properties. The same basic transistor architecture is used across different regions, but the varying gate dielectric materials enable the device to handle both low-voltage and high-voltage operations within a single integrated structure
Data Source
AI summary
A semiconductor device includes a substrate having a first, a second, a third, and a fourth region; a first gate structure in the first region and including a first gate dielectric layer, and a first, a second, and a third conductive layer; a second gate structure in the second region and including a second gate dielectric layer, and the second and the third conductive layer; a third gate structure in the third region and including a third gate dielectric layer, and the second and the third conductive layer; and a fourth gate structure in the fourth region and including the second gate dielectric layer, and a fourth and the third conductive layer. The first gate dielectric layer includes a material of the second gate dielectric layer and a first element, and the third gate dielectric layer includes a material of the second gate dielectric layer and a second element.