Thin Film Transistor Conductive Region for Interface and Current
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Solution Overview
Problem
The manufacturing process of oxide thin film transistors, such as indium gallium zinc oxide TFTs, is sensitive to acidic or alkaline etching solutions, leading to damage of the back interface characteristics and performance degradation, which is not addressed effectively by existing back-channel etching processes that increase complexity and cost.
Innovation Solution
A conductive region is introduced between the source and drain electrodes within the active layer, alleviating interface characteristic degradation and reducing channel length, thereby increasing on-state current through the formation of a conductive region using methods like plasma treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If back-channel etching process is used to improve interface characteristics, then manufacturing complexity and cost increase
Solution Approach 1:
The patent extracts the harmful etching process from the manufacturing flow by introducing a conductive region that is spaced apart from the source and drain electrodes, eliminating the need for back-channel etching while preserving interface characteristics
Solution Approach 2:
The conductive region acts as an intermediary element between the source and drain electrodes, providing a pathway to improve interface characteristics without requiring direct contact with the electrodes or additional etching steps
2Ease of manufacture
If conventional active layer structure is used, then manufacturing process is simple, but channel length is long resulting in low on-state current
Solution Approach 1:
The patent segments the channel region by introducing a conductive region spaced apart from the electrodes, effectively dividing the channel into multiple sections and reducing the effective channel length to increase on-state current while maintaining manufacturing simplicity
Solution Approach 2:
The conductive region is positioned locally within the active layer at a specific spacing from the electrodes, creating a localized modification that reduces channel length without requiring complex manufacturing changes
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 enhances interface performance, decreases channel length, and increases on-current of the thin film transistor while simplifying the manufacturing process and reducing costs compared to etch-stop layer processes.
Implementation Method 1
A conductive region is introduced between the source and drain electrodes within the active layer, alleviating interface characteristic degradation and reducing channel length, thereby increasing on-state current
Implementation Method 2
performing a conduction treatment on a portion of the active layer to allow the portion to become a conductive region... the conduction treatment comprises performing a plasma treatment on the active layer
Data Source
AI summary
A thin film transistor includes an active layer, a source electrode and a drain electrode. The active layer includes a conductive region and the conductive region is between the source electrode and the drain electrode and is spaced apart from at least one of the source electrode and the drain electrode.