Ferroelectric Transistor Fabrication With Defect-Free Channel Layer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for forming ferroelectric layers in transistors often damage the channel layer due to plasma bombardment, leading to defects and degradation in current on/off ratio, which compromises transistor performance.
Innovation Solution
A non-plasma deposition process is used to form the ferroelectric layer, reducing plasma-induced defects and allowing for subsequent annealing to remove defects, ensuring a substantially defect-free channel layer and improved transistor performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If plasma deposition process is used to form ferroelectric layer, then deposition efficiency is improved, but channel layer is damaged due to plasma bombardment causing defects and degradation in current on/off ratio
Solution Approach 1:
The harmful plasma bombardment component is extracted and removed from the deposition process. The patent specifically eliminates the plasma step while retaining the beneficial ferroelectric layer formation through non-plasma deposition methods, thereby preventing channel layer damage while maintaining deposition efficiency
Solution Approach 2:
An intermediary approach is introduced by using non-plasma deposition methods (such as atomic layer deposition or chemical vapor deposition) as a mediator between the need for efficient ferroelectric layer formation and the requirement to protect the channel layer from plasma-induced damage
2Ease of manufacture
If plasma deposition process is used, then ferroelectric layer formation is achieved, but defects are introduced in channel layer leading to performance degradation
Solution Approach 1:
The patent converts the harmful effect of plasma by completely avoiding its use. Instead of trying to mitigate plasma damage, the invention adopts non-plasma deposition techniques that inherently prevent channel layer damage while still achieving high-quality ferroelectric layer formation, thus turning the potential harm into a benefit by eliminating the source of damage
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 approach prevents degradation of the current on/off ratio and ensures the performance of the second transistor by reducing defects and enhancing the integrity of the channel layer.
Implementation Method 1
A non-plasma deposition process is used to form the ferroelectric layer, reducing plasma-induced defects
Implementation Method 2
allowing for subsequent annealing to remove defects, ensuring a substantially defect-free channel layer
Data Source
AI summary
A transistor includes an insulating layer, a source region, a drain region, a channel layer, a ferroelectric layer, an interfacial layer, and a gate electrode. The source region and the drain region are respectively disposed on two opposite ends of the insulating layer. The channel layer is disposed on the insulating layer, the source region, and the drain region. The ferroelectric layer is disposed over the channel layer. The interfacial layer is sandwiched between the channel layer and the ferroelectric layer. The gate electrode is disposed on the ferroelectric layer.