Phase-Separated Dielectric Structure for Organic 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 desired electrical insulating properties and compatibility with semiconductor materials.
Innovation Solution
A phase-separated dielectric structure comprising a lower-k dielectric polymer and a higher-k dielectric polymer, where the lower-k polymer is in lower concentration near the semiconductor layer, fabricated using a single-step liquid deposition process that allows for phase separation during or after deposition, enhancing compatibility and reducing fabrication complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional silicon-based thin film transistor circuits are used, then high switching speeds and reliable performance are achieved, but fabrication cost and process complexity increase significantly
Solution Approach 1:
The patent changes the material parameters by transitioning from silicon-based semiconductors to organic/polymer semiconductors, and from conventional inorganic dielectrics to organic/polymer dielectrics. This material parameter change enables fabrication via solution processing at lower temperatures, significantly reducing process complexity while maintaining device functionality
Solution Approach 2:
The patent replaces the mechanical/physical vacuum deposition and high-temperature processing systems with liquid-based solution processing methods. This substitution allows deposition from liquid solutions at lower temperatures, simplifying the fabrication infrastructure required
2Ease of manufacture
If liquid-based deposition techniques are used for plastic/organic thin film transistors, then fabrication cost and complexity are reduced, but electrical insulating properties and material compatibility deteriorate
Solution Approach 1:
The patent employs composite dielectric structures combining multiple organic/polymer materials with different dielectric constants (k-values). By creating phase-separated morphologies where high-k regions provide electrical performance and low-k regions provide insulating properties, the composite structure achieves both ease of liquid-based manufacture and reliable electrical characteristics
Solution Approach 2:
The patent creates spatially varying dielectric properties within the gate dielectric layer by forming phase-separated regions with different k-values at different locations. High-k regions are positioned where electrical performance is critical, while low-k regions are positioned where electrical insulation is paramount, optimizing both properties simultaneously
3Ease of manufacture
If single-phase dielectric materials are used, then fabrication process is simple, but ability to accommodate both electrical insulating property and semiconductor compatibility deteriorates
Solution Approach 1:
The patent uses composite phase-separated dielectric structures combining materials with different dielectric constants. This composite approach allows simultaneous achievement of good electrical insulating properties (from low-k phases) and good compatibility with semiconductor materials (from high-k phases), which cannot be obtained from single-phase materials
Solution Approach 2:
The patent segments the dielectric material into distinct phases with different k-values, where each phase provides specific functionality. This segmentation allows the dielectric layer to simultaneously fulfill multiple contradictory requirements that a homogeneous single-phase material cannot satisfy
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 phase-separated dielectric structure improves device yield and performance by offering better electrical properties, achieving high mobility and current on/off ratio in thin film transistors, while simplifying the fabrication process and reducing costs.
Implementation Method 1
A phase-separated dielectric structure comprising a lower-k dielectric polymer and a higher-k dielectric polymer
Data Source
AI summary
An electronic device including in any sequence: (a) a semiconductor layer; and (b) a dielectric structure comprising a lower-k dielectric polymer and a higher-k dielectric polymer, wherein the lower-k dielectric polymer is in a lower concentration than the higher-k dielectric polymer in a region of the dielectric structure closest to the semiconductor layer.