Fluorine-Doped Gate Insulator Blocks Hydrogen Diffusion
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Solution Overview
Problem
The use of different metal materials in the metal gate layer for active-matrix organic light-emitting diodes (AMOLEDs) increases material requirements, processing complexity, and costs due to the need for multiple materials to prevent hydrogen atoms from entering the channel region, which affects the conductivity of metal oxide layers.
Innovation Solution
Doping the gate insulating layer above the channel region with fluorine atoms to block hydrogen diffusion, allowing hydrogen atoms to pass through other regions and form conductors, thereby simplifying the process and reducing costs by using a single metal for the metal gate layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If different metal materials are used in the metal gate layer to prevent hydrogen atoms from entering the channel region, then the semiconductor characteristics of the channel region are maintained, but the material requirements and processing complexity increase
Solution Approach 1:
The patent introduces a fluorine-containing inorganic layer as an intermediary barrier between the metal gate layer and the metal oxide semiconductor layer. This fluorine-containing layer acts as a selective diffusion barrier that prevents hydrogen atoms from entering the channel region while allowing the metal gate layer to be made of a single metal material, thereby reducing processing complexity while maintaining semiconductor characteristics
Solution Approach 2:
The patent changes the chemical composition parameter of the gate insulating layer by incorporating fluorine atoms to form a fluorine-containing inorganic layer. This parameter change creates a selective barrier with specific diffusion properties that blocks hydrogen atoms, replacing the need for complex multi-material gate structures
2Reliability
If different metal materials are used in the metal gate layer to prevent hydrogen diffusion, then the conductivity control is improved, but the manufacturing cost increases
Solution Approach 1:
The fluorine-containing inorganic layer serves as a cost-effective intermediary that provides the necessary hydrogen blocking function. This single-layer fluorine-containing barrier replaces the need for expensive multi-material gate structures, thereby reducing manufacturing costs while maintaining effective conductivity control in the channel region
Solution Approach 2:
By changing the chemical composition of the gate insulating layer to include fluorine, the patent creates a functional barrier that achieves conductivity control at lower manufacturing cost, eliminating the need for expensive multi-material metal gate layers
3Reliability
If multiple materials are used in the metal gate layer to block hydrogen atoms, then the semiconductor properties are preserved, but the material requirements increase
Solution Approach 1:
The fluorine-containing inorganic layer acts as a mediator that provides the hydrogen blocking function. This single fluorine-containing layer eliminates the need for multiple different metal materials in the gate structure, thereby reducing material requirements while preserving semiconductor properties through selective hydrogen diffusion blocking
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 maintains semiconductor characteristics in the channel region while allowing the metal oxide semiconductor to form conductors elsewhere, reducing material and processing costs while maintaining the electrical properties of thin film transistors.
Implementation Method 1
the gate insulating layer above the channel region comprises fluorine atoms, and other regions of the gate insulating layer do not comprise the fluorine atoms; performing a hydrogenation activation process, such that the metal oxide layer of the channel region maintains semiconductor characteristics due to diffusion of hydrogen atoms being blocked by the fluorine atoms
Implementation Method 2
the hydrogen atoms pass through other regions of the metal oxide layer except for the channel region to form a conductor
Data Source
AI summary
A method of fabricating an array substrate, an array substrate, a display panel, and a display device are provided. In an embodiment, a gate insulating layer above a channel region is doped with fluorine atoms. Since a fluorine-containing inorganic layer can absorb hydrogen atoms, it can block hydrogen atoms from diffusing downward into a metal oxide semiconductor, thereby avoiding affecting electrical properties of thin film transistors. Simultaneously, only a metal is required to use as a metal gate layer, which simplifies process and reduces production costs.