Organic Semiconductor Composition Electromigration Inhibitors

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Solution Overview

Problem

Existing organic thin film transistors face challenges in achieving high inter-electrode insulation reliability and mobility due to electromigration, particularly as electronic parts become compact and highly integrated, leading to insufficient performance when using antioxidant compositions like those disclosed in JP2004-88094A or JP2005-5582A.

Innovation Solution

An organic semiconductor composition is developed containing specific migration inhibitors represented by Formulas (I), (II), and (III), which inhibit electromigration by interacting with electrodes and reducing moisture absorption at the organic semiconductor layer interface, thereby maintaining mobility and enhancing insulation reliability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If antioxidant compositions (JP2004-88094A, JP2005-5582A) are used to inhibit oxidation and deterioration, then the organic semiconductor layer stability is improved, but the inter-electrode insulation reliability deteriorates due to electromigration

Engineering Contradiction:

Improveorganic semiconductor layer stabilityVSAvoidinter-electrode insulation reliability

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The patent introduces a migration inhibitor as an intermediary substance that specifically targets and prevents electromigration between electrodes. This mediator works alongside the antioxidant to provide dual protection: the antioxidant stabilizes the organic semiconductor layer against oxidation, while the migration inhibitor blocks metal ion migration paths, thereby resolving the contradiction between layer stability and insulation reliability

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent employs a composite composition containing both antioxidant and migration inhibitor substances. This composite material approach allows simultaneous achievement of oxidation resistance (from antioxidant) and electromigration prevention (from migration inhibitor), resolving the technical contradiction by combining multiple functional materials in a unified system

Inventive Principle:

Principle #40Composite materials

2Productivity

If metal wiring is miniaturized to achieve compact and highly integrated electronic parts, then the device integration is improved, but the inter-electrode insulation reliability deteriorates due to increased electromigration

Engineering Contradiction:

Improvedevice integrationVSAvoidinter-electrode insulation reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies preliminary anti-action by incorporating migration inhibitors into the organic semiconductor composition before device operation. This preventive measure creates a protective environment that counteracts electromigration effects before they can occur, enabling miniaturized wiring to maintain insulation reliability despite increased susceptibility to migration phenomena

Inventive Principle:

Principle #9Preliminary anti-action

3Stability of the object's composition

If conventional antioxidant compositions are used, then the organic semiconductor layer deterioration is inhibited, but the mobility deteriorates due to insufficient performance

Engineering Contradiction:

Improveorganic semiconductor layer stabilityVSAvoidcarrier mobility

Core Design Contradiction:

Stability of the object's compositionVSSpeed

Solution Approach 1:

The patent changes the chemical composition parameters by introducing migration inhibitors with specific molecular structures and concentrations. This parameter modification optimizes the balance between stability and mobility: the migration inhibitor prevents electromigration-induced degradation while maintaining charge carrier transport pathways, thereby improving mobility without sacrificing layer stability

Inventive Principle:

Principle #35Parameter changes

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 composition effectively inhibits electromigration, improving the insulation reliability and mobility of organic thin film transistors, enabling the production of high-performance electronic paper and display devices.

Implementation Method 1

reducing moisture absorption at the organic semiconductor layer interface

Methodology Applied

Scientific EffectMoisture absorption: Absorption (physical)

Data Source

PatentUS9882137B2Organic semiconductor composition, organic thin film transistor, electronic paper, and display device

Publication Date: 2018.01.30 FUJIFILM CORP

AI summary

The present invention provides an organic semiconductor composition which makes it possible to prepare an organic thin film transistor having excellent insulation reliability while inhibiting the deterioration of mobility, and to provide an organic thin film transistor prepared using the composition. Furthermore, the present invention provides electronic paper and a display device which contain the organic thin film transistor. The organic semiconductor composition according to the present invention contains an organic semiconductor material and at least one kind of migration inhibitor selected from a compound represented by the following Formula (I), a compound represented by the following Formula (II), and a compound represented by the following Formula (III).