Organic Semiconductor Composition with Siloxane Surfactant
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Solution Overview
Problem
Existing organic semiconductor compositions fail to achieve optimal mobility and temporal stability, which are crucial for applications in flexible electronics such as organic transistors in liquid crystal displays and RFID tags.
Innovation Solution
A specific organic semiconductor composition incorporating a condensed polycyclic aromatic group with a sulfur, nitrogen, or selenium atom, combined with two organic solvents and a surfactant having an organic siloxane moiety, where the solvents' solubility parameters differ by at least 2 MPa1/2, enhancing the mobility and stability of the organic semiconductor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic semiconductor compositions are used, then the device can be manufactured with standard materials, but the mobility and temporal stability of the organic semiconductor are insufficient
Solution Approach 1:
The patent uses a composite material system consisting of an organic semiconductor compound combined with a specific surfactant (having an organic siloxane moiety with the formula -O-SiR1). This composite approach allows the surfactant to modify the semiconductor's properties at the molecular level, improving temporal stability and mobility without requiring complex device structures. The surfactant-semiconductor combination creates a stable complex that maintains performance over time.
Solution Approach 2:
The patent changes the chemical parameters of the organic semiconductor composition by introducing a surfactant with specific molecular characteristics (organic siloxane moiety). This parameter change at the molecular level fundamentally alters the semiconductor's temporal stability and mobility properties, transforming it from a conventional unstable material to a high-performance stable material suitable for flexible electronics.
2Ease of manufacture
If the organic semiconductor composition is simplified, then the manufacturing process becomes easier, but the mobility and stability performance deteriorates
Solution Approach 1:
The surfactant acts as an intermediary substance between the organic semiconductor compound and the environment (oxygen, moisture). It forms a protective interface that prevents degradation of the semiconductor, thereby improving temporal stability and mobility. This intermediary approach maintains manufacturing simplicity while achieving high performance, as the surfactant can be easily incorporated into existing fabrication processes.
3Reliability
If high-performance organic semiconductor materials are used to improve mobility and stability, then the device performance increases, but the composition becomes more complex and difficult to manufacture
Solution Approach 1:
The surfactant provides self-service functionality by automatically forming a protective complex with the organic semiconductor compound during the manufacturing process. This self-organizing behavior occurs without requiring additional processing steps or complex equipment, thereby improving mobility and temporal stability while maintaining ease of manufacture. The surfactant essentially self-assembles around the semiconductor molecules to create a stable configuration.
Data Source
Figure 1~2
AI summary
An object of the present invention is to provide an organic semiconductor composition from which an organic semiconductor having excellent mobility and temporal stability is obtained, and an organic semiconductor element having an organic semiconductor formed of the organic semiconductor composition. An organic semiconductor composition of the present invention includes an organic semiconductor which has a condensed polycyclic aromatic group having 4 or more rings, among which 2 or more rings contain at least one atom selected from the group consisting of a sulfur atom, a nitrogen atom, a selenium atom, and an oxygen atom, and has a structure selected from the group consisting of a benzene ring, a naphthalene ring, and a phenanthrene ring as a partial structure in the condensed polycyclic aromatic group, an organic solvent A, an organic solvent B, and a surfactant having an organic siloxane moiety represented by -O-SiR1R2-, and in a case where an SP value of the organic solvent A is denoted by SP(A) and an SP value of the organic solvent B is denoted by SP(B), SP(B) - SP(A) ≥ 2 MPa1/2 is satisfied.