Thin Film Transistor with Low-k Dielectric for Flexible Electronics
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Solution Overview
Problem
Current industrial designs for flexible 3C products face challenges in integrating flexible electronic elements, as organic materials, while improving flexibility, can lead to shortened service life.
Innovation Solution
A thin film transistor design incorporating a gate electrode, semiconductor layer, gate dielectric layer, first dielectric layer, source electrode, and drain electrode, where the first dielectric layer has a dielectric constant less than that of the gate dielectric layer, and is made of materials like polyimide or silsesquioxane polymer, ensuring flexibility while maintaining electrical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If organic materials are used to improve flexibility, then flexibility is improved, but service life is shortened
Solution Approach 1:
The patent employs a composite dielectric structure consisting of a gate dielectric layer (first material) and a first dielectric layer (second material) with different dielectric constants. This composite structure combines the advantages of both materials to achieve both flexibility and long service life, resolving the contradiction between using organic materials for flexibility versus their shorter service life.
Solution Approach 2:
The patent applies different dielectric materials in different regions of the device. The gate dielectric layer uses a material with higher dielectric constant for electrical performance, while the first dielectric layer uses a material with lower dielectric constant (less than 4) for flexibility. This local differentiation allows each region to optimize for its specific function.
2Reliability
If inorganic materials are used instead of organic materials, then service life is improved, but flexibility is reduced
Solution Approach 1:
The patent creates a composite dielectric system where inorganic gate dielectric material provides long service life and stability, while the organic first dielectric material with low dielectric constant provides flexibility. This composite approach allows the device to achieve both durability and bendability required for flexible 3C products.
Solution Approach 2:
Different regions of the dielectric structure use different materials optimized for their specific requirements. The gate dielectric layer uses inorganic material for reliability, while the first dielectric layer uses organic material for flexibility, allowing the overall device to achieve both service life and adaptability.
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 design enhances the flexibility of electronic elements while maintaining their electrical properties, suitable for use in flexible photoelectric devices, and does not significantly increase manufacturing costs or complexity.
Implementation Method 1
a dielectric constant of the first dielectric layer is less than a dielectric constant of the gate dielectric layer, and the dielectric constant of the first dielectric layer is less than 4 and greater than 0
Data Source
AI summary
A thin film transistor includes a gate electrode, a semiconductor layer, a gate dielectric layer, a first dielectric layer, a source electrode, and a drain electrode. The gate electrode is disposed on a substrate. The semiconductor layer is disposed on the substrate and overlaps with the gate electrode. The gate dielectric layer is disposed between the gate electrode and the semiconductor layer. The first dielectric layer is disposed on the substrate and covers two sides of the gate electrode or the semiconductor layer. The dielectric constant of the first dielectric layer is less than the dielectric constant of the gate dielectric layer, and the dielectric constant of the first dielectric layer is less than 4. The source electrode and the drain electrode are disposed on the substrate. The source electrode is separated from the drain electrode, and the source electrode and the drain electrode separately contact the semiconductor layer.