Cyclic Amine SAM for Work Function Matching
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Solution Overview
Problem
Existing organic electronic devices face challenges in matching the work functions of metal or metal oxide electrodes with organic electronic materials, and there is a need for suitable self-assembled monolayers to modify these electrodes for improved compatibility and performance.
Innovation Solution
A self-assembled monolayer comprising a moiety of general formula (I) is used to modify metal or metal oxide electrodes, allowing for the adjustment of their work functions and enhancing the compatibility with organic electronic materials, which includes specific functional groups and aromatic rings to improve charge injection and transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal or metal oxide electrodes are used in organic electronic devices, then good electrical conductivity is achieved, but mismatch of work functions with organic electronic materials occurs
Solution Approach 1:
The patent changes the chemical composition and molecular structure parameters of the electrode surface by introducing self-assembled monolayers with specific functional groups (carboxylic acid, hydroxyl, amine) to adjust the work function of metal electrodes, making it compatible with organic electronic materials
Solution Approach 2:
The patent introduces self-assembled monolayer molecules as intermediary layers between metal electrodes and organic electronic materials. These monolayers act as mediators that bridge the work function mismatch, enabling effective charge transfer and improving device performance
2Reliability
If self-assembled monolayers are introduced to modify electrode work function, then work function compatibility is improved, but device structure complexity increases
Solution Approach 1:
The patent utilizes self-assembled monolayers that automatically organize and assemble on metal surfaces without requiring complex external assembly processes. The molecules self-organize into ordered monolayer structures through spontaneous adsorption, simplifying the manufacturing process despite the added functional layer
Solution Approach 2:
The patent employs ultra-thin self-assembled monolayer films (typically 1-3 nm thick) that provide the necessary work function modification while maintaining structural simplicity and not significantly increasing the overall device complexity
3Reliability
If conventional thiol compounds are used for gold electrode modification, then work function adjustment is achieved, but adhesion and charge injection performance are insufficient
Solution Approach 1:
The patent designs composite molecular structures combining thiol anchor groups for gold surface binding with aromatic ring systems and various functional groups (carboxylic acid, hydroxyl, amine) to simultaneously achieve strong adhesion, appropriate work function, and improved charge injection performance
Solution Approach 2:
The patent applies different functional groups at different positions within the monolayer molecule: thiol groups at the electrode interface for strong adhesion, aromatic rings in the middle for structural stability and charge transport, and polar functional groups at the organic material interface for work function adjustment and improved charge injection
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 self-assembled monolayer effectively modifies the surface properties of metal or metal oxide electrodes, enhancing the performance of organic electronic devices by improving charge injection and transport, and allowing for better layer deposition and compatibility with organic materials.
Implementation Method 1
the metal (or metal oxide) electrodes may be covered with a self-assembled monolayer (SAM) of suitable molecules
Data Source
AI summary
The present invention relates to a cyclic amine surface modifier. In addition the present invention also relates to organic electronic devices comprising such cyclic amine surface modifier.