Thiazole-Containing Organic Semiconductor Polymer for OTFTs
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Solution Overview
Problem
Current organic thin film transistors (OTFTs) face challenges in achieving high charge carrier mobility and low blocking leakage current, particularly with thiophene-based polymers, which limit their application in electronic devices due to inferior performance compared to small molecular materials and require costly vacuum processes.
Innovation Solution
A composition containing thiazole rings and hetero or arylene groups is integrated into the polymer main chain, enhancing charge carrier mobility and reducing leakage current, allowing for the formation of an organic semiconductor polymer that can be used as an active layer in OTFTs, processed through methods like screen printing or spin coating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If thiophene-based polymer is used as organic semiconductor material, then solution processing is enabled with reduced cost, but charge carrier mobility is limited to 0.01-0.02 cm2/Vs
Solution Approach 1:
The patent applies composite materials by integrating both p-type semiconductor units (thiophene, hetero arylene, arylene) and n-type semiconductor units (thiazole rings) into a single copolymer structure. This composite approach at the molecular level allows the material to exhibit enhanced charge carrier mobility (0.1-1.0 cm2/Vs) while maintaining solution processability, resolving the contradiction between ease of manufacture and device performance reliability.
2Reliability
If pentacene crystals are used to achieve high charge carrier mobility of 3.2-5.0 cm2/Vs, then mobility is improved, but vacuum processing is required which increases cost and complexity
Solution Approach 1:
The patent replaces the mechanical vacuum deposition process with a solution-based processing method. By designing copolymer materials that can be dissolved and applied through printing or spin-coating techniques, the invention achieves high charge carrier mobility (0.1-1.0 cm2/Vs) without requiring vacuum equipment, thereby substituting complex mechanical processing with simpler chemical solution processing.
3Reliability
If regioregular poly(3-hexylthiophene) (P3HT) is used, then charge carrier mobility increases to about 0.01 cm2/Vs, but blocking leakage current increases to about 10^-9 A or more
Solution Approach 1:
The patent applies local quality by incorporating n-type semiconductor units (thiazole rings) at specific positions within the copolymer chain among the p-type units. This localized modification of the polymer structure creates regions with different electronic properties that work together to reduce blocking leakage current while maintaining or enhancing charge carrier mobility, addressing the harmful effect of leakage current in conventional P3HT materials.
Data Source
AI summary
Disclosed herein is a composition containing hetero arylene or arylene showing a p-type semiconductor property in addition to thiophene showing a p-type semiconductor property and thiazole rings showing a n-type semiconductor property at a polymer main chain, an organic semiconductor polymer containing the composition, an organic active layer containing the organic semiconductor polymer, an organic thin film transistor (OTFT) containing the organic active layer, an electronic device containing the OTFT, and a method of preparing the same. The composition of example embodiments, which is used in an organic semiconductor polymer and contains thiazole rings, may exhibit increased solubility to an organic solvent, coplanarity, processability and an improved thin film property.