Oxide Thin-Film Transistor Protection Layer for Light Stability
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Solution Overview
Problem
Oxide thin film transistors are sensitive to light, leading to photo-generated current carriers that can cause instability and affect their operation.
Innovation Solution
A thin film transistor design with a channel layer composed of tin, indium, and gallium, and a first protection layer containing praseodymium to absorb photo-generated electrons, reducing the impact of light irradiation and improving stability, along with a method for manufacturing this structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If an oxide thin film transistor is used to improve mobility and resolution, then the display device performance is improved, but the transistor becomes sensitive to light and generates photo-generated current carriers that affect stability
Solution Approach 1:
The active layer is segmented into multiple functional layers: a channel layer (IGZO) for carrier transport and protection layers (TiO2, SiO2) for light filtering. This segmentation allows the channel layer to maintain high mobility while the protection layers eliminate light sensitivity, resolving the contradiction between speed and reliability.
Solution Approach 2:
Protection layers consisting of TiO2 and SiO2 are introduced as intermediary layers between the light source and the channel layer. These intermediary layers filter harmful light wavelengths before they reach the sensitive oxide semiconductor, preventing photo-generated current carrier generation while allowing the channel layer to maintain its high mobility characteristics.
2Measurement precision
If the active layer is made of oxide semiconductor to achieve high mobility, then resolution is improved, but photo-generated current carriers are generated under light irradiation affecting transistor operation
Solution Approach 1:
TiO2 and SiO2 protection layers serve as intermediary filters that selectively block harmful light wavelengths from reaching the oxide semiconductor channel layer. This allows the channel layer to maintain its high resolution performance while the intermediary layers eliminate light sensitivity by absorbing or reflecting harmful radiation before it can generate photo-currents.
Solution Approach 2:
The active layer is constructed as a composite structure combining IGZO (for high mobility and resolution) with TiO2 and SiO2 (for light protection). This composite material approach allows the structure to simultaneously achieve high resolution through the IGZO channel while the TiO2/SiO2 components provide optical filtering to eliminate light sensitivity.
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 solution effectively shields the channel layer from light-induced instability, trapping photo-generated current carriers in the protection layer and enhancing the mobility and response speed of the thin film transistor.
Implementation Method 1
the first protection layer includes praseodymium used to absorb photo-generated electrons in the metal oxide semi-conductor and reduce a photo-generated current caused by light irradiation
Data Source
AI summary
The present disclosure relates to the field of display technologies, and in particular to a thin film transistor and a method for manufacturing the same, an array substrate and a display device. An active layer of the thin film transistor includes at least two metal oxide semi-conductor layers, the at least two metal oxide semi-conductor layers include a channel layer and a first protection layer, and metals in the channel layer include tin, and at least one of indium, gallium and zinc. The first protection layer includes praseodymium used to absorb photo-generated electrons from at least one of the channel layer and the first protection layer which is under light irradiation and reduce a photo-generated current caused by the light irradiation.