Electrostatic Doping GNR TFET Tri-Gate Design
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Solution Overview
Problem
The physical limitations of Si-based transistors, such as quantum tunneling, hinder their ability to scale down further, preventing efficient switching between on and off states, which challenges the continuous improvement in computer performance as per Moore's law.
Innovation Solution
The Electrostatic Doping Based All Graphene Nanoribbon Tunnel Field Effect Transistor (TFET) with a tri-gate design, using Armchair Graphene Nanoribbons for the channel and electrodes, and a dielectric region, enables fast switching and high on/off current ratio with a scalable and chemically stable structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Si-based transistors are scaled down to continue Moore's law, then transistor density and computing performance improve, but quantum tunneling occurs and switching capability fails
Solution Approach 1:
The patent changes the material parameter from silicon to graphene nanoribbon, fundamentally altering the electrical properties. GNR's unique band structure and electrostatic doping characteristics enable continued scaling without quantum tunneling-induced switching failure, thus improving productivity while maintaining reliability
Solution Approach 2:
The patent replaces the conventional silicon-based field effect mechanism with an electrostatic doping mechanism in graphene nanoribbons. This substitution eliminates the quantum tunneling problem inherent in scaled silicon devices, allowing the transistor to maintain switching capability at smaller dimensions
2Stability of the object's composition
If additional encapsulation is added to protect the device structure, then chemical and mechanical stability improve, but device complexity and fabrication difficulty increase
Solution Approach 1:
The graphene nanoribbon material inherently provides its own chemical and mechanical stability without requiring external encapsulation layers. This self-protecting property eliminates additional structural components, thereby maintaining stability while reducing device complexity and fabrication difficulty
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 solution provides a fast switching speed and high on/off current ratio, allowing for continuous transistor size reduction while maintaining stability and simplicity in fabrication, effectively addressing the limitations of Si-based transistors.
Implementation Method 1
Electrostatic Doping Based All GNR Tunnel Field Effect Transistor
Implementation Method 2
the quantum tunneling occurs and the transistor would fail to switch between on and off states
Data Source
AI summary
The present invention disclose an Electrostatic doping (ED)-based graphene nanoribbon (GNR) tunneling field-effect transistor (TFET) with tri-gate design. This device uses hydrogen-passivated GNR heterojunction as a carrier path way and functions as a power switch providing a switching speed of ˜0.3 ps−1 an ION/IOFF ratio as high as 1014 with the on-state current in the order of 103 μA/μm. This disclosed invention consists of two electrode, two electrode extensions, six metallic gate regions, and six dielectric regions.