Organic Transistor Compound for High Carrier Mobility
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Solution Overview
Problem
Existing organic semiconductor compounds used in transistors exhibit low carrier mobility and solubility, making them unsuitable for high-performance organic transistors, as they require high crystallinity for charge transport over long distances and solubility in organic solvents for film formation.
Innovation Solution
A compound with a condensed cyclic skeleton, specifically a π-conjugated polymer or pendant-type polymer with specific substituents, is used in the semiconductor active layer, enhancing carrier mobility and solubility by optimizing the molecular arrangement and intermolecular interactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic semiconductor compounds are used in transistors, then device fabrication is simpler, but carrier mobility is low and transistor performance is poor
Solution Approach 1:
The patent modifies the molecular structure parameters of organic semiconductor compounds by introducing specific substituents (Formula W) with controlled carbon atom numbers (4-20) and types (alkyl, alkoxy, aryl, heteroaryl groups). This parameter optimization simultaneously improves carrier mobility and solubility, resolving the contradiction between performance and manufacturability
Solution Approach 2:
The patent creates composite molecular structures combining a core condensed cyclic skeleton (Formula 1) with specific substituent groups (Formula W). This composite approach achieves both high carrier mobility through the conjugated core and high solubility through the tailored substituents, enabling excellent transistor performance with simplified fabrication
2Reliability
If high crystallinity compounds are used to achieve long-distance charge transport, then carrier mobility improves, but solubility in organic solvents decreases
Solution Approach 1:
The patent applies local quality by differentiating the functional roles of different molecular regions: the condensed cyclic skeleton (Formula 1) provides high crystallinity and carrier mobility, while the specific substituent groups (Formula W) provide solubility. This localized functional assignment resolves the contradiction between mobility and solubility
Solution Approach 2:
The patent segments the molecule into distinct functional domains: a rigid conjugated core for charge transport and flexible substituent groups for solvation. This segmentation allows each part to optimize its local properties without compromising the other, achieving both high mobility and solubility
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 compound achieves high carrier mobility and solubility, leading to improved transistor performance with reduced threshold voltage shift and enhanced chemical stability, allowing for effective and long-lasting transistor operation.
Implementation Method 1
When voltage is applied to the source and drain electrodes, holes or electrons are injected into the organic semiconductor layer and transported to the other side
Implementation Method 2
By applying voltage to the gate electrode, the concentration of holes or electrons in the organic semiconductor layer is controlled, thereby controlling the on-state current
Data Source
Figure 1~2
AI summary
Provided are an organic transistor containing a compound, which is represented by the following formula, results in high carrier mobility when being used in a semiconductor active layer of the organic transistor, and exhibits high solubility in an organic solvent, in a semiconductor active layer; a compound; an organic semiconductor material for a non-light-emitting organic semiconductor device; a material for an organic transistor; a coating solution for a non-light-emitting organic semiconductor device; and an organic semiconductor film for a non-light-emitting organic semiconductor device (X is O, S, or Se; each of p and q is an integer of 0 to 2; each of R1 to R10, Ra, and Rb is hydrogen, halogen, or -L-R; one of R1 to R10, Ra, and Rb is -L-R; in a case where at least one of R5 or R6 is -L-R, L is an ethenyl group or an ethynyl group; L is a specific divalent linking group; and R is an alkyl group, a cyano group, a vinyl group, an ethynyl group, an oxyethylene group, an oligo-oxyethylene group in which a repetition number v of an oxyethylene unit is equal to or greater than 2, a siloxane group, an oligosiloxane group having two or more silicon atoms, or a trialkylsilyl group).