Thin Film Transistor Dielectric Barrier Against Hydrogen Diffusion
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Solution Overview
Problem
Thin film transistors (TFTs) face challenges due to hydrogen diffusion, which alters the surface electronic states and transistor characteristics, leading to instability and performance shifts.
Innovation Solution
A hydrogen-blocking dielectric barrier layer is formed on the semiconducting metal oxide plates and optionally as a capping layer, preventing hydrogen diffusion and maintaining stable transistor characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thin film transistor is fabricated without a hydrogen-blocking barrier layer, then the manufacturing process is simpler and fewer materials are used, but hydrogen diffusion occurs which alters surface electronic states and shifts transistor characteristics
Solution Approach 1:
A hydrogen-blocking dielectric barrier layer is introduced as an intermediary component between the oxide semiconductor layer and the environment. This barrier layer prevents hydrogen diffusion into the semiconductor, thereby stabilizing transistor characteristics without complicating the overall device architecture or manufacturing process
Solution Approach 2:
The hydrogen-blocking barrier layer is formed in advance during the fabrication process, before the transistor is put into operation. This preliminary protective action prevents hydrogen contamination from occurring in the first place, ensuring long-term stability of the transistor characteristics
2Reliability
If a hydrogen-blocking dielectric barrier layer is added to prevent hydrogen diffusion, then transistor characteristic stability is improved, but the number of fabrication steps and materials increases
Solution Approach 1:
The barrier layer is designed with specific material composition and thickness parameters that optimize its hydrogen-blocking capability while maintaining compatibility with existing fabrication processes. By carefully controlling these parameters, the layer provides effective protection without requiring complex manufacturing procedures
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 hydrogen-blocking dielectric barrier effectively prevents hydrogen diffusion, maintaining consistent electronic states and transistor performance throughout the operational lifetime of the TFTs.
Implementation Method 1
A hydrogen-blocking dielectric barrier layer is formed on the semiconducting metal oxide plates and optionally as a capping layer, preventing hydrogen diffusion and maintaining stable transistor characteristics
Data Source
AI summary
A thin film transistor includes an insulating matrix layer including an opening therein, a hydrogen-blocking dielectric barrier layer continuously extending over a bottom surface and sidewalls of the opening and over a top surface of the insulating matrix layer, a gate electrode located within the opening, a stack of a gate dielectric and a semiconducting metal oxide plate overlying the gate electrode and horizontally-extending portions of the hydrogen-blocking dielectric barrier layer that overlie the insulating matrix layer, and a source electrode and a drain electrode contacting a respective portion of a top surface of the semiconducting metal oxide plate.