Hydrogen-Blocking Layer for Flexible AMOLED Thin Film Transistors
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Solution Overview
Problem
Conventional methods for fabricating thin film transistors in flexible AMOLED displays face challenges in achieving sufficient hydrogenation effects while ensuring flexibility, due to the limited hydrogen atom supply from thin inorganic layers, leading to poor electron mobility and display performance.
Innovation Solution
A method involving the formation of a hydrogen-blocking layer on the capacitive insulating layer to prevent hydrogen diffusion, allowing for higher utilization of hydrogen atoms during hydrogenation treatment at lower temperatures, which enhances the hydrogenation effect and flexibility of the display apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the capacitive insulating layer and interlayer insulating layer are designed as thin inorganic layers to improve flexibility, then the flexibility of AMOLED display apparatus is improved, but the hydrogenation treatment effect deteriorates due to insufficient hydrogen atom supply
Solution Approach 1:
A hydrogen-blocking layer is introduced as an intermediary component between the capacitive insulating layer and the external environment. This layer acts as a mediator that controls hydrogen atom diffusion, preventing hydrogen loss while maintaining the thin-layer structure needed for flexibility. The hydrogen-blocking layer enables the thin inorganic layer structure to provide sufficient hydrogen for treatment without compromising device flexibility.
Solution Approach 2:
The hydrogen-blocking layer is formed in advance before the hydrogenation treatment process. This preliminary action prepares the structure to retain hydrogen atoms during subsequent high-temperature treatment, ensuring that hydrogen atoms remain available for the intended hydrogenation function rather than diffusing outward and being lost.
2Reliability
If high-temperature annealing is used to achieve hydrogenation treatment, then the hydrogenation effect is improved, but the flexibility and structural integrity of thin film structures deteriorates
Solution Approach 1:
The hydrogen-blocking layer serves as a protective cushion that prevents hydrogen atom loss during high-temperature annealing. By blocking hydrogen diffusion pathways, this layer cushions against the potential failure mode of hydrogen depletion, enabling the system to withstand high temperatures without compromising the hydrogenation effect or structural integrity.
3Length of stationary object
If the thickness of inorganic insulating layers is reduced to improve flexibility, then the flexibility is improved, but the amount of hydrogen atoms available for hydrogenation decreases
Solution Approach 1:
The structure is divided into layers with different functional qualities: the capacitive insulating layer provides hydrogen atoms locally, while the hydrogen-blocking layer provides a localized barrier function to prevent hydrogen loss. This local differentiation of functions allows the thin capacitive insulating layer to maintain its hydrogen supply capability despite reduced thickness, as the hydrogen-blocking layer compensates for potential hydrogen loss at the interface.
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 improves the hydrogenation efficiency, increasing the electron mobility of polysilicon thin film transistors and the overall display performance of flexible AMOLED devices by optimizing the use of hydrogen atoms, thereby enhancing the flexibility and performance of the display apparatus.
Implementation Method 1
the capacitive insulating layer providing hydrogen atoms for the hydrogenation treatment of the active layer and the gate insulating layer
Implementation Method 2
the hydrogen-blocking layer blocks the outwardly diffused hydrogen atoms during the high-temperature hydrogenation
Data Source
AI summary
The present application discloses a method for fabricating a thin film transistor including the steps of: sequentially forming an active layer, a gate insulating layer, a gate, and a capacitive insulating layer on a substrate, the gate insulating layer isolating the active layer from the gate; a hydrogen-blocking layer is formed on the side of the capacitive insulating layer facing away from the substrate, and the hydrogen-blocking layer covering the capacitive insulating layer; and performing hydrogenation treatment to the gate insulating layer and the active layer. The present application also discloses a thin film transistor and a display apparatus. In improving the flexibility of the AMOLED display apparatus while ensuring the hydrogenation effect of the polysilicon thin film transistor, the fabricated thin film transistor has high electron mobility, and the display apparatus has a good display performance.