Multi-Threshold Semiconductor Stacks With Variable Insulator Thickness
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Solution Overview
Problem
Current semiconductor devices with single threshold voltages have limited applicability and performance, as they cannot efficiently cater to diverse electronic applications requiring varying switching speeds and power consumption levels.
Innovation Solution
A semiconductor device with multiple threshold voltages is designed by stacking semiconductor layers with different insulating thicknesses and dopant configurations, allowing for distinct threshold voltages and functions, and incorporating stress regions to enhance carrier mobility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single threshold voltage is used in semiconductor devices, then the device structure is simple and manufacturing is easier, but the applicability and performance are limited for diverse electronic applications
Solution Approach 1:
The semiconductor device is divided into multiple stacks (first stack, second stack, third stack), each with different insulating thicknesses to achieve different threshold voltages. This segmentation allows the device to provide multiple threshold voltage levels for diverse electronic applications while maintaining a systematic structure.
Solution Approach 2:
Different regions of the semiconductor device have different insulating thicknesses (first insulating stack with thickness T1, second insulating stack with thickness T2, third insulating stack with thickness T3), creating local variations in threshold voltage. This enables each region to be optimized for specific functions requiring different switching characteristics.
2Productivity
If multiple threshold voltages are implemented with different insulating thicknesses, then applicability and switching performance are improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent implements a dynamic multi-threshold voltage architecture where different stacks can be selectively activated based on operational requirements. The varying insulating thicknesses (T1 < T2 < T3) create a range of threshold voltages that can be dynamically selected to optimize switching speed for different application scenarios.
3Speed
If multiple threshold voltages are implemented with different insulating thicknesses, then switching speed and performance are improved, but power consumption may increase due to additional structures
Solution Approach 1:
The patent changes the insulating thickness parameter across different stacks to create a progression of threshold voltages. By adjusting the thickness parameter (T1, T2, T3), the device can optimize switching speed for high-performance applications while providing lower threshold options for power-sensitive applications, enabling energy-speed tradeoff optimization.
Data Source
AI summary
The present application discloses a semiconductor device including a substrate; a first semiconductor stack having a first threshold voltage and comprising a first insulating stack positioned on the substrate; a second semiconductor stack having a second threshold voltage and comprising a second insulating stack positioned on the substrate; and wherein the first threshold voltage is different the second threshold voltage; a thickness of the first insulating stack is different from a thickness of the second insulating stack.