Phase-Separated Dielectric Structure for Thin Film Transistors
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Solution Overview
Problem
Conventional silicon-based thin film transistor circuits are costly and complex to fabricate, making them unsuitable for large-area devices and low-end applications, while existing dielectric materials for plastic/organic thin film transistors lack desirable electrical insulating properties and compatibility with semiconductor materials.
Innovation Solution
A phase-separated dielectric structure is fabricated using a dielectric composition of lower-k and higher-k dielectric materials, which are not phase-separated prior to liquid deposition, allowing for a single-step process that forms a dielectric structure with a high overall dielectric constant, suitable for thin film transistors, and includes a hydrophobic lower-k dielectric material and a polar higher-k dielectric material, enhancing compatibility and electrical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional silicon-based thin film transistor circuits are fabricated using photolithographic processes, then high switching speeds and reliable performance are achieved, but fabrication cost and process complexity increase significantly
Solution Approach 1:
The patent changes the processing parameters from high-temperature vacuum photolithography to low-temperature liquid-based processing. The dielectric composition is processed at temperatures below the degradation point of the organic semiconductor, enabling fabrication of functional TFTs without requiring complex high-temperature vacuum equipment
Solution Approach 2:
The patent replaces expensive silicon-based materials and complex photolithographic equipment with cheaper organic semiconductor materials and simple liquid-based processing techniques. The dielectric composition uses inexpensive lower-k and higher-k dielectric materials that can be processed using basic laboratory equipment
2Ease of manufacture
If liquid-based patterning and deposition techniques are used to fabricate thin film transistors, then fabrication cost and process complexity are reduced, but suitable dielectric materials with both good electrical insulating property and compatibility with semiconductor materials are difficult to find
Solution Approach 1:
The patent creates a composite dielectric material by combining lower-k dielectric material and higher-k dielectric material in a single composition. The lower-k dielectric material provides compatibility with organic semiconductor materials, while the higher-k dielectric material enhances electrical insulating properties. This composite approach allows both requirements to be satisfied simultaneously
Solution Approach 2:
The dielectric composition is segmented into two functional components: lower-k dielectric material for interface compatibility and higher-k dielectric material for electrical insulation. This segmentation allows each component to fulfill its specific function while working together in the same layer
3Ease of manufacture
If a single dielectric layer is used, then fabrication process is simple, but it is difficult to accommodate both good electrical insulating property and compatibility with semiconductor materials
Solution Approach 1:
The single dielectric layer is formulated as a composite material containing both lower-k dielectric material for semiconductor compatibility and higher-k dielectric material for electrical insulation. This composite structure provides both required properties within one layer, maintaining process simplicity while achieving reliable electrical performance
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 process enables the fabrication of thin film transistors with improved electrical performance and reduced manufacturing complexity, achieving high mobility and on/off ratio, while being cost-effective and compatible with semiconductor materials.
Implementation Method 1
causing phase separation of the lower-k dielectric material and the higher-k dielectric material to form a phase-separated dielectric structure comprising a first phase and a second phase
Data Source
Figure 1~2
Figure 3~4
AI summary
A process for fabricating an electronic device including: depositing a layer comprising a semiconductor; liquid depositing a dielectric composition comprising a lower-k dielectric material, a higher-k dielectric material, and a liquid, wherein the lower-k dielectric material and the higher-k dielectric material are not phase separated prior to the liquid depositing; and causing phase separation of the lower-k dielectric material and the higher-k dielectric material to form a phase-separated dielectric structure wherein the lower-k dielectric material is in a higher concentration than the higher-k dielectric material in a region of the dielectric structure closest to the layer comprising the semiconductor, wherein the depositing the layer comprising the semiconductor is prior to the liquid depositing the dielectric composition or subsequent to the causing phase separation.