Solvent-Processable Thin-Layer Chemical Transistor Fabrication
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional thin-layer field-effect transistors (TFTs) face defects and high manufacturing costs due to processing steps like patterning and etching, which are exacerbated by the need for larger display sizes and finer image definitions in liquid crystal displays and other flat displays.
Innovation Solution
A thin-layer chemical transistor with a metal/solid electrolyte/semiconductor structure is developed, using organic solvent-soluble compounds for both the solid electrolyte and semiconductor layers, which allows for defect minimization and cost reduction through solvent-based fabrication processes like ink jet printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional metal-base semiconductors are used in TFT manufacturing with photoresist processing steps, then TFTs can be formed for integrated circuits and liquid crystal displays, but small defects are introduced due to patterning and etching processes
Solution Approach 1:
The patent replaces conventional mechanical/chemical processing methods (photoresist patterning, etching) with a printing-based deposition method. The TFT structure is formed by sequentially printing metal layer, organic semiconductor layer, and encapsulation layers onto the substrate, eliminating the need for photoresist processing steps that cause defects.
Solution Approach 2:
The patent changes the manufacturing approach from subtractive processing (etching) to additive processing (printing/deposition). This fundamental parameter change in the manufacturing methodology eliminates the harmful effects of photoresist processing while maintaining TFT functionality.
2Manufacturing precision
If the number of TFTs is increased to achieve larger display size and finer image definition, then display performance is improved, but the probability of defects in TFT manufacture increases
Solution Approach 1:
By replacing photoresist-based patterning with direct printing deposition, the patent eliminates the source of defects that becomes more problematic when manufacturing larger numbers of TFTs for high-resolution displays.
Solution Approach 2:
The printing method allows for direct formation of TFT structures without requiring additional photoresist processing steps, reducing the overall process complexity and defect probability as display size and resolution increase.
3Ease of manufacture
If photoresist processing steps are used for patterning and etching, then TFTs can be manufactured, but manufacturing cost increases due to process complexity
Solution Approach 1:
The patent substitutes the complex multi-step photoresist processing sequence with a simpler printing-based deposition process, directly forming the TFT structure through sequential material deposition.
Solution Approach 2:
The patent extracts and removes the photoresist processing steps from the manufacturing process, eliminating the associated complexity and cost while retaining the essential TFT fabrication capability through printing methods.
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 eliminates the need for photoresist processing, reduces defect probability, and lowers manufacturing costs while maintaining a switching speed suitable for paper and flat panel displays.
Implementation Method 1
a solid electrolyte layer containing a specific polymer having a high ionic conductivity between the metal and semiconductor layers
Implementation Method 2
using organic solvent-soluble compounds to form the solid electrolyte and semiconductor layers
Data Source
AI summary
In a thin-layer chemical transistor having a metal/solid electrolyte/semiconductor structure, the materials of which the solid electrolyte and semiconductor layers are made comprise organic solvent-soluble compounds. The transistor can be fabricated solely by solvent processes, typically printing techniques including ink jet printing.