Fluorinated Silyl Compound for Metal Electrode Work Function Modification
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Solution Overview
Problem
Existing surface modifiers for metal electrodes, such as thiols, are susceptible to impurities and storage instability, and reactive silanes are ineffective on metals with no surface oxide film, particularly gold, silver, copper, and platinum, limiting their ability to consistently change the work function effectively.
Innovation Solution
A reactive silyl compound with fluorinated hydrocarbon groups, represented by General Formula (1), is used to modify metal electrodes, increasing their work function by forming a self-assembled monolayer, even on metals without surface oxide films, and providing stability and solvent resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thiols are used as surface modifiers on metal electrodes, then the work function can be changed and durability is improved, but impurities cause defects in the monolayer and storage stability deteriorates
Solution Approach 1:
The patent changes the chemical structure parameter of the surface modifier from thiol to reactive silane compound with fluorinated hydrocarbon groups. This parameter change enables the formation of a self-assembled monolayer on metal electrodes without being affected by impurities, thereby maintaining monolayer quality while achieving the desired work function modification and durability improvement.
Solution Approach 2:
The patent replaces thiol-based surface modifiers (which require strict purity control and stable storage conditions) with reactive silane compounds that are more tolerant to impurities and have better storage stability. This substitution allows for more relaxed manufacturing conditions while maintaining reliable performance.
2Ease of operation
If reactive silanes are used as surface modifiers, then ease of operation is improved, but they are ineffective on metals without surface oxide films
Solution Approach 1:
The patent uses a composite molecular structure combining reactive silane groups (for bonding to metal surfaces) with fluorinated hydrocarbon groups (for work function modification). This composite structure enables the surface modifier to effectively interact with metals without oxide films while maintaining ease of operation and handling stability.
Solution Approach 2:
The patent modifies the chemical parameters of the silane compound by introducing fluorinated hydrocarbon groups, which changes the surface properties and enables effective work function modification on metal electrodes. This parameter change expands the adaptability to various metal surfaces including those without oxide films.
3Manufacturing precision
If thiol purification processes are performed to remove impurities, then manufacturing precision is improved, but separation difficulty increases due to similar molecular weights
Solution Approach 1:
The patent replaces thiol-based surface modifiers with reactive silane compounds that do not require stringent purification processes. The silane compounds are inherently more stable and less sensitive to impurities, thereby eliminating the need for complex purification steps while maintaining high manufacturing precision.
Solution Approach 2:
The patent changes the chemical class from thiol to reactive silane, which fundamentally alters the purification requirements. The silane compounds have different physical and chemical properties that make them easier to purify and handle, reducing manufacturing complexity while achieving the desired surface modification performance.
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 surface-modified metal electrodes exhibit increased work function, improved durability, and solvent resistance, with the method allowing for simple and effective industrial application.
Implementation Method 1
forming a self-assembled monolayer
Implementation Method 2
reactive silyl compound... into contact with a surface of a metal electrode
Data Source
AI summary
Provided are: a surface modifying agent for metal electrodes, which contains a reactive silyl compound represented by general formula (1); a metal electrode which is surface-modified by this surface modifying agent; and a method for producing a surface-modified metal electrode. Rf-X-A-SiR13-n(OR2)n (1) (In the formula, Rf represents an alkyl group having 1-10 carbon atoms or an aryl group having 6-10 carbon atoms which may have an alkyl substituent having 1-5 carbon atoms, wherein at least one hydrogen atom is substituted by a fluorine atom; X represents a single bond or a divalent group that is selected from among -O-, -NH-, -C(=O)O-, -C(=O)NH-, -OC(=O)NH- and - NHC(=O)NH-; A represents a linear, branched or cyclic divalent aliphatic hydrocarbon group having 1-10 carbon atoms, a divalent aromatic hydrocarbon group having 6-10 carbon atoms or a single bond; R1 represents a monovalent hydrocarbon group having 1-3 carbon atoms; R2 represents a monovalent hydrocarbon group having 1-3 carbon atoms, an acetyl group, a propanoyl group or a hydrogen atom; and n represents an integer of 1-3.)