Donor-Acceptor Polymer Semiconductor Films for Stable Carrier Mobility

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Solution Overview

Problem

Existing organic semiconductor elements face challenges in achieving high carrier mobility with low mobility variation and excellent temporal stability under high temperature and high humidity conditions.

Innovation Solution

A specific organic semiconductor element with a donor-acceptor-type polymer having a constitutional repeating unit, represented by Formula 1, is used, which includes an electron donor unit and an electron acceptor unit, enhancing carrier conduction through intermolecular interactions and film uniformity, and is formulated into a compound with a molecular weight of 2,000 or greater.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional organic semiconductor materials are used, then device fabrication is simpler, but carrier mobility is low and temporal stability under high temperature and high humidity is poor

Engineering Contradiction:

Improvetemporal stability under high temperature and high humidityVSAvoidcomplexity of semiconductor material structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent employs donor-acceptor type copolymers that combine electron-donating units and electron-accepting units in a single polymer chain. This composite molecular structure enables simultaneous achievement of high carrier mobility and excellent temporal stability under high temperature and high humidity conditions, while maintaining ease of fabrication through solution processing

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent systematically varies molecular weight, degree of polymerization, and chemical structure parameters of the organic semiconductor materials. By optimizing these parameters, the invention achieves high carrier mobility and temporal stability without compromising fabrication simplicity

Inventive Principle:

Principle #35Parameter changes

2Reliability

If high carrier mobility is achieved through complex molecular structures, then mobility increases, but mobility variation and instability under harsh conditions worsen

Engineering Contradiction:

Improvecarrier mobility consistencyVSAvoidmolecular structure stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The donor-acceptor type copolymer structure creates a balanced molecular architecture where electron-donating and electron-accepting units work synergistically. This composite structure provides both high carrier mobility and consistent performance with reduced mobility variation, while maintaining structural stability under high temperature and high humidity conditions

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent introduces specific functional groups and structural motifs at localized positions within the polymer chain to enhance intermolecular interactions. This local optimization of molecular structure improves carrier transport while maintaining overall structural stability and reducing mobility variation across different devices

Inventive Principle:

Principle #3Local quality

3Productivity

If solution processing is used for mass production, then manufacturing efficiency increases, but control over film uniformity and mobility precision decreases

Engineering Contradiction:

Improvemass production efficiencyVSAvoidfilm uniformity control

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent optimizes solution processing parameters including solvent selection, coating speed, drying temperature, and molecular weight of the semiconductor material. These parameter optimizations enable precise control of film thickness and uniformity while maintaining high productivity through solution-based mass production processes

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The use of donor-acceptor type copolymers with tailored solubility characteristics enables effective solution processing. The composite molecular structure provides both high solubility for efficient coating and appropriate intermolecular interactions for forming uniform films with controlled mobility, achieving mass production efficiency without sacrificing manufacturing precision

Inventive Principle:

Principle #40Composite materials

Data Source

PatentEP3258513B1Organic semiconductor element, manufacturing method thereof, compound, organic semiconductor composition, organic semiconductor film, and manufacturing method thereof

Publication Date: 2023.09.13 FUJIFILM CORP

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AI summary

Objects of the present invention are to provide an organic semiconductor element in which carrier mobility is high, variation of mobility is suppressed, and temporal stability under high temperature and high humidity is excellent, and a manufacturing method thereof, to provide a novel compound suitable for an organic semiconductor, and to provide an organic semiconductor film in which mobility is high, variation of mobility is suppressed, and temporal stability under high temperature and high humidity is excellent, a manufacturing method thereof, and an organic semiconductor composition that can suitably form the organic semiconductor film. The organic semiconductor element according to the present invention is an organic semiconductor layer containing a compound having a constitutional repeating unit represented by Formula 1 and having a molecular weight of 2,000 or greater. (̵D-A)̵ (1)