Organic Optoelectronic Layer Transfer for Stable Non-Fullerene Films

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Solution Overview

Problem

Conventional organic thin film optoelectronic devices face challenges in stability and reproducibility due to solvent penetration and interlayer mixing during the wet process of spin coating, especially when forming photosensitive layers with non-fullerene acceptors.

Innovation Solution

The dry decal process is introduced to form a photosensitive layer thin film using a non-fullerene acceptor, where a second layer composition containing a donor and an acceptor is coated on a mediator and then transferred onto a first layer in a dry condition, optimizing the formation process to improve stability and reproducibility.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If spin coating is used to form a photosensitive layer, then the layer can be formed through a simple wet process, but solvent penetration damages the lower thin film and causes instability

Engineering Contradiction:

Improveease of forming photosensitive layerVSAvoidstability of device structure

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

A mediator layer is introduced between the lower thin film and the photosensitive layer. The mediator prevents direct contact between the solvent and the lower thin film, thereby preventing solvent penetration and damage. The photosensitive layer is formed on the mediator through spin coating, while the mediator acts as a barrier to protect the underlying structure.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The device structure is segmented into distinct layers: the lower thin film, the mediator layer, and the photosensitive layer. This segmentation isolates the photosensitive layer formation process from the lower thin film, allowing the wet process to be applied without damaging the underlying structure.

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If spin coating is used with heterojunction structure, then the photosensitive layer can be formed with donor and acceptor materials, but material deflection occurs due to density and surface energy differences

Engineering Contradiction:

Improveability to form heterojunction structureVSAvoiduniformity of material distribution

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The mediator layer serves as an intermediary substrate that controls the deposition of donor and acceptor materials. By adjusting the surface energy of the mediator, uniform nucleation and growth of both materials are achieved, preventing deflection and ensuring homogeneous distribution throughout the photosensitive layer.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The mediator layer provides locally optimized surface properties that promote uniform material deposition. The surface energy of the mediator is specifically tuned to accommodate both donor and acceptor materials, ensuring consistent local quality across the entire photosensitive layer formation process.

Inventive Principle:

Principle #3Local quality

3Reliability

If non-fullerene acceptor is used in photosensitive layer, then photo-responsivity can be improved, but the existing coating process causes instability and requires additional thermal treatment

Engineering Contradiction:

Improvephoto-responsivity of deviceVSAvoidprocess complexity and additional treatment

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The mediator layer enables stable formation of non-fullerene acceptor-based photosensitive layers without requiring additional thermal treatment. The mediator provides a controlled interface that ensures proper adhesion and morphology, eliminating the need for post-deposition thermal processing steps.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The surface energy parameters of the mediator are optimized to match the non-fullerene acceptor materials, enabling stable film formation at lower temperatures. This parameter optimization allows the photosensitive layer to be formed with improved stability without requiring high-temperature thermal treatment.

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

This method enhances the stability and reproducibility of the photosensitive layer formation, minimizes interfacial resistance, improves charge flow, and increases photo-responsivity by effectively separating and collecting charges formed by incident light.

Implementation Method 1

forming a second layer of thin film on a first layer by moving the second layer composition coated on the mediator onto the first layer

Methodology Applied

Scientific EffectDry decal process:

Data Source

PatentUS20250031561A9Method for manufacturing organic optoelectronic device and organic optoelectronic device manufactured thereby

Publication Date: 2025.01.23 CHUNG ANG UNIV IND ACADEMIC COOP FOUND

AI summary

Disclosed is a method for manufacturing an organic optoelectronic device, the method including: coating a second layer composition on a mediator; and forming a second layer of thin film on a first layer by moving the second layer composition coated on the mediator onto the first layer, wherein the second layer composition contains a donor and an acceptor and the acceptor includes a non-fullerene compound.