Nitrogen-Containing Interfacial Layer for TFET Fabrication
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Solution Overview
Problem
Tunneling field effect transistors (TFETs) face challenges with low on-state current and sub-threshold swing, which hinders their application and performance in semiconductor integrated circuits.
Innovation Solution
A method for fabricating TFETs involving the formation of an interfacial layer containing nitrogen through a plasma treatment process using nitrogen and oxygen gases, combined with a precursor, to enhance the device's performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional MOSFETs are used to achieve high integration density, then device complexity and integration are improved, but leakage current increases and power consumption rises
Solution Approach 1:
The patent changes the fundamental operating mechanism of the transistor from conventional drift-diffusion current to band-to-band tunneling current. This parameter change in the current transport mechanism enables sub-60mV/dec subthreshold swing, which directly reduces off-state leakage current and power consumption while maintaining high integration density capabilities
2Loss of energy
If TFETs are used to reduce leakage current and power consumption, then energy efficiency is improved, but on-state current becomes too low for certain applications
Solution Approach 1:
The patent employs composite material structures including high-k dielectric materials (such as HfO2, Al2O3, TiO2) combined with nitrogen-containing interfacial layers. This composite structure achieves both low leakage current through the high-k material and high on-state current through the nitrogen-enhanced tunneling interface, resolving the contradiction between energy efficiency and reliability
3Loss of energy
If TFETs are used to achieve sub-60mV/dec subthreshold swing, then energy efficiency is improved, but sub-threshold swing performance still needs further improvement
Solution Approach 1:
The patent introduces nitrogen specifically at the critical semiconductor-dielectric interface region to enhance band-to-band tunneling. This local quality enhancement at the interface, while keeping other regions unchanged, achieves superior subthreshold swing performance below 60mV/dec for optimized energy efficiency
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
The approach improves the on-state current and sub-threshold swing of TFETs, addressing the limitations of existing TFETs and enabling better performance in semiconductor devices.
Implementation Method 1
performing a plasma treatment process to inject a first gas containing nitrogen
Implementation Method 2
injecting a second gas containing oxygen; and injecting a precursor to react with the first gas and the second gas for forming the interfacial layer
Data Source
AI summary
A method for fabricating a tunnel field effect transistor (TFET) includes the steps of providing a substrate and then forming an interfacial layer on the substrate. Preferably, the step of forming the interfacial layer includes the steps of: performing a plasma treatment process to inject a first gas containing nitrogen; injecting a second gas containing oxygen; and injecting a precursor to react with the first gas and the second gas for forming the interfacial layer.