IGZO TFT Array Substrate With Segmented Metal Contact Layer
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Solution Overview
Problem
Conventional TFT devices using indium gallium zinc oxide (IGZO) as a channel material face high electrical resistance in the conductorized area, leading to performance deterioration and potential failure due to long-time thermal annealing processes.
Innovation Solution
The array substrate design includes a metal contact layer with a conductive area on either side of an insulating area, corresponding to the channel area of the active layer, which improves conductivity and stability, and is oxidized to form a bridge connecting the source, drain, and active layer, while the insulating area can become part of the gate insulating layer, protecting the active layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal contact layer is completely conductorized to improve connectivity, then electrical conduction is enhanced, but stability of TFT device decreases due to thermal annealing effects
Solution Approach 1:
The metal contact layer is divided into functionally distinct conductive and insulating regions. The insulating area over the channel provides stability by preventing unwanted electrical interactions and thermal degradation in that region, while the conductive areas maintain necessary electrical connectivity at source/drain terminals.
Solution Approach 2:
The metal contact layer acts as an intermediary structure that mediates between the source/drain layers and the active layer. By having insulating area covering the channel region, it provides a stable barrier that prevents direct metal-semiconductor contact in the channel, thereby enhancing device stability while still allowing proper electrical connection through the conductive areas.
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 configuration reduces the electrical resistance of the conductorized IGZO area, enhances the stability of TFT devices, and prevents performance deterioration by improving the conductivity and protecting the active layer.
Implementation Method 1
a metal contact layer disposed on the active layer and including a conductive area and an insulating area... which is oxidized to form a bridge connecting the source, drain, and active layer
Data Source
AI summary
An array substrate, a manufacturing method thereof, and a display panel are provided. The array substrate includes an active layer, a metal contact layer, a gate insulating layer, a gate layer, a source/drain layer, and a pixel electrode, which are sequentially disposed on a substrate. An insulating area of the metal contact layer corresponds to a channel area of the active layer, and a conductive area of the metal contact layer is disposed at two sides of the insulating area. A source and a drain of the source/drain layer are individually connected to the conductive area. Therefore, a problem of relatively high electrical resistance of a conductorized IGZO area in conventional TFT devices can be solved.