Superhydrophobic Layer for Thin Film Transistor Channel Protection
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Solution Overview
Problem
Existing thin film transistors face challenges in preventing channel corrosion during the etching process, particularly for oxide thin film transistors, where an etch barrier layer is necessary to protect the channel from etchant damage.
Innovation Solution
A superhydrophobic layer with multi-level nanostructures is integrated on the active layer, serving as an ohmic contact and etch barrier, which prevents etchant adhesion and damage by its physical structure, allowing for stable formation of source and drain without affecting their formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an etch barrier layer is added to protect the channel from etchant damage, then channel protection is improved, but device complexity increases
Solution Approach 1:
The superhydrophobic layer is formed on the active layer and serves multiple functions: it acts as an etch barrier layer to protect the channel from etchant damage, and simultaneously serves as an ohmic contact layer to reduce contact resistance between the source/drain electrodes and the active layer. This multi-functional design eliminates the need for separate etch barrier and ohmic contact layers, thereby reducing device complexity while maintaining channel protection.
2Reliability
If a separate etch barrier layer is used, then channel protection is improved, but manufacturing process complexity increases
Solution Approach 1:
The patent combines the etch barrier layer and ohmic contact layer into a single integrated layer structure. The superhydrophobic layer is formed directly on the active layer through a unified process, merging two previously separate manufacturing steps into one. This integration simplifies the manufacturing process while ensuring both channel protection and good ohmic contact properties.
3Ease of manufacture
If the superhydrophobic layer is made from the same material as the active layer, then manufacturing is simplified, but material functionality must be optimized
Solution Approach 1:
The patent utilizes surface parameter changes rather than material composition changes to achieve the desired functionality. By creating multi-level nanostructures on the surface of the active layer material, the superhydrophobic properties are achieved through topographical modification. This approach maintains material consistency for ease of manufacture while the precise nanostructure formation provides the necessary surface precision for both etch barrier and ohmic contact functions.
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 superhydrophobic layer effectively prevents channel corrosion during etching, simplifies the manufacturing process, and enhances ohmic contacts, offering a more robust and efficient thin film transistor design.
Implementation Method 1
the superhydrophobic layer includes a plurality of multi-level nanostructures protruding from the surface of the active layer
Implementation Method 2
forming a conductive layer covering the superhydrophobic layer, the conductive layer being attached onto the superhydrophobic layer
Data Source
AI summary
A thin film transistor, a manufacturing method thereof, an array substrate, and a display panel are provided. The thin film transistor includes a semiconductor layer, a source and a drain. The semiconductor layer includes an active layer and a superhydrophobic layer. The active layer includes a source contact, a drain contact and a channel portion. The source corresponds to the source contact, and the drain corresponds to the drain contact. The superhydrophobic layer is disposed on a surface of the active layer proximal to the source and the drain. The superhydrophobic layer includes a plurality of multi-level nanostructures protruding from the surface of the active layer, and the superhydrophobic layer at least covers a channel portion of the active layer.