Organic Semiconductor Compositions for High Mobility

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Solution Overview

Problem

Existing organic semiconductor compositions for OFETs face limitations due to low mobility values and the use of chlorinated solvents, which are environmentally harmful and not suitable for industrial printing processes, while high permittivity polymers are often associated with reduced mobility in these devices.

Innovation Solution

The development of organic semiconductor compositions combining polyacene compounds with organic binders having a permittivity between 3.4 and 8.0, allowing for high mobility values and solubility in non-chlorinated solvents, thereby overcoming the limitations of previous compositions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If high permittivity polymers are used in organic semiconductor compositions, then the compositions can be processed more easily, but the mobility values of the resulting devices are reduced

Engineering Contradiction:

ImproveprocessabilityVSAvoidmobility value

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent changes the permittivity parameter of the polymer binder from high (>3.3) to low (3.3 or less), which resolves the contradiction by maintaining processability while achieving high mobility values (≥1.0 cm²/Vs) that were previously unattainable with high permittivity polymers

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite material system combining polyacene compounds with low permittivity polymers, achieving a synergistic effect where the composite formulation enables both ease of manufacture and high device mobility, overcoming the limitations of individual components

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If chlorinated solvents are used in organic semiconductor compositions, then the solubility and processability are improved, but environmental harm and unsuitability for industrial printing increase

Engineering Contradiction:

ImprovesolubilityVSAvoidenvironmental harm

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent converts the harmful chlorinated solvents into beneficial non-chlorinated alternatives, achieving both environmental sustainability and adequate solubility for industrial printing processes, thereby eliminating harm while preserving manufacturing ease

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent changes the solvent type parameter from chlorinated to non-chlorinated, which eliminates environmental harm while maintaining the solubility and processability required for industrial applications through optimized formulation

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP3024039B1Organic semiconductor compositions

Publication Date: 2020.05.20 SMARTKEM LTD

Figure 1~4

AI summary

The present invention relates to organic semiconductor compositions and organic semiconductor layers and devices comprising such organic semiconductor compositions. The invention is also concerned with methods of preparing such organic semiconductor compositions and layers and uses thereof. The invention has application particularly in the field of displays such as organic field effect transistors (OFETS), integrated circuits, organic light emitting diodes (OLEDS), photodetectors, organic photovoltaic (OPV) cells, sensors, lasers, memory elements and logic circuits.