Carbon Allotrope Semiconductor Active Layer for Thin-Film Transistors
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Solution Overview
Problem
Current thin-film transistors in display devices face challenges with electron mobility, leakage current, and on/off ratio, particularly in active-matrix addressing schemes, where materials like amorphous silicon, oxide semiconductors, and polycrystalline silicon have limitations in terms of performance and cost-effectiveness.
Innovation Solution
Incorporating a carbon allotrope, such as reduced graphene oxide, unoxidized graphene, or graphene nanoribbons, dispersed within a semiconductor material to form domains within the active layer of thin-film transistors, which improves charge mobility and maintains a low on/off ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If amorphous silicon is used as the active layer material, then the deposition process is simplified and production cost is reduced, but electron mobility is low (0.5 cm²/Vs)
Solution Approach 1:
The patent uses a composite material consisting of oxide semiconductor particles dispersed in a binder resin matrix. This composite structure combines the high electron mobility of oxide semiconductors with the processability of binder resins, achieving both manufacturing ease and high electron mobility (>10 cm²/Vs) in the active layer of thin-film transistors.
2Reliability
If oxide semiconductor is used as the active layer material, then electron mobility is improved, but production cost increases and device characteristics deteriorate due to high leakage current
Solution Approach 1:
The patent creates a composite active layer material where oxide semiconductor particles are dispersed in a binder resin. This composite structure maintains the high electron mobility of oxide semiconductors while the binder resin matrix suppresses leakage current, resolving the contradiction between improved electron mobility and reduced leakage current.
Solution Approach 2:
The patent applies local quality by having oxide semiconductor particles concentrated in specific regions for high mobility pathways, while the binder resin provides the surrounding matrix that suppresses leakage. This spatial differentiation of functions allows simultaneous achievement of high electron mobility and low leakage current.
3Reliability
If polycrystalline silicon is used as the active layer material, then electron mobility is improved, but manufacturing complexity and production cost increase
Solution Approach 1:
The patent uses a composite material system where oxide semiconductor particles provide high electron mobility comparable to polycrystalline silicon, while the binder resin enables simpler solution-based processing. This eliminates the complex high-temperature crystallization processes required for polycrystalline silicon while maintaining high electron mobility.
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 carbon allotrope-semiconductor composition enhances electron mobility and prevents a decrease in the on/off ratio, leading to improved performance and durability of thin-film transistors in display devices.
Implementation Method 1
Each domain is formed by chemical bonding between the carbon atoms in the carbon allotrope.
Implementation Method 2
The carbon allotrope-semiconductor composition enhances electron mobility and prevents a decrease in the on/off ratio, leading to improved performance and durability of thin-film transistors in display devices.
Data Source
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AI summary
Carbon allotropes, a thin-film transistor array substrate comprising the same, and a display device comprising the same are disclosed. The thin-film transistor array substrate comprising a substrate, a gate electrode on the substrate, a gate insulating film on the gate electrode, an active layer positioned on the gate insulating film and comprising a semiconductor material and a plurality of carbon allotropes, and a source electrode and a drain electrode that make contact with the active layer.