Organic Semiconductor Formulation for Screen Printing
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Solution Overview
Problem
Existing organic semiconductor (OSC) formulations for screen printing in organic electronic devices, such as OPVs and OPDs, often contain high viscosity additives that lead to poor film formation and charge transfer efficiency.
Innovation Solution
A novel OSC formulation comprising a p-type and an n-type OSC, dissolved in a solvent mixture of terpenes or terpenoids and aromatic or heteroaromatic solvents, which enables the formation of smooth photoactive OSC layers and well-defined patterns through printing methods like screen printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If high viscosity additives are used in OSC formulations for screen printing, then the formulation maintains paste-like consistency at rest, but film uniformity and charge transfer efficiency deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the solvent system by replacing traditional high viscosity additives with a specific mixture of aromatic solvents (e.g., o-dichlorobenzene, m-dichlorobenzene, p-dichlorobenzene) and aliphatic solvents (e.g., cyclohexanone, gamma-butyrolactone). This parameter change maintains the necessary paste-like consistency while improving film uniformity and charge transfer efficiency.
Solution Approach 2:
The patent uses a composite solvent system combining aromatic solvents and aliphatic solvents in specific ratios. This composite approach creates a formulation that exhibits shear-thinning behavior (paste-like at rest, fluid during printing) without requiring harmful high viscosity additives, thus resolving the contradiction between ease of operation and manufacturing precision.
2Stability of the object's composition
If high viscosity additives are used in OSC formulations, then the formulation remains stable at rest, but charge transfer efficiency deteriorates due to insulation paths
Solution Approach 1:
The patent changes the chemical parameters of the formulation by eliminating high viscosity additives and using a controlled mixture of aromatic and aliphatic solvents. This parameter change maintains formulation stability at rest while removing the creation of insulation paths, thereby improving charge transfer efficiency and device reliability.
3Ease of manufacture
If conventional solvent mixtures are used, then the formulation is easy to prepare, but film formation and pattern definition deteriorate
Solution Approach 1:
The patent specifies precise parameter ranges for the solvent mixture (e.g., aromatic solvent content of 20-80 wt%, specific boiling point ranges) that maintain ease of preparation while enabling excellent film formation and pattern definition during screen printing. The shear-thinning behavior achieved through this parameter optimization allows the formulation to be printed with sharp patterns and then stabilize into uniform films.
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 new formulation achieves improved film uniformity and charge transfer efficiency, minimizing insulation paths and enhancing the performance of organic electronic devices.
Implementation Method 1
dissolved in a solvent mixture of terpenes or terpenoids and aromatic or heteroaromatic solvents
Implementation Method 2
the solvent mixture should be evaporated upon drying (under heat and/or vacuum)
Data Source
AI summary
The invention relates to novel organic semiconductor (OSC) formulations, to their use for the preparation of OSC layers or OSC patterns in organic electronic (OE) devices, especially organic photovoltaic (OPV) devices, perovskite-based solar cell (PSC) devices, organic photo-detectors (OPD), organic field effect transistors (OFET) and organic light emitting diodes (OLED), and to OE, OPV, PSC, OPD, OFET and OLED devices comprising an OSC layer or OSC pattern prepared from these OSC formulations.