Transparent Electrode Organic Functional Layer Silver Film
Solution Overview
Problem
Existing transparent electrodes face challenges in achieving both high conductivity and transparency due to the trade-off between sheet resistance and light transmittance, particularly when using silver or silver-aluminum alloys, which also suffer from oxidation issues that increase resistance.
Innovation Solution
A transparent electrode is developed with a conductive layer composed of silver as the main component, incorporating an organic functional layer containing specific organic compounds that promote a uniform film growth, preventing aggregation and ensuring high continuity and low sheet resistance while maintaining excellent light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a thin silver film is used to maintain light transmittance, then transparency is improved, but sheet resistance increases and conductivity deteriorates
Solution Approach 1:
The patent changes the physical and chemical parameters of the silver film by controlling deposition conditions (temperature, pressure, deposition rate) to achieve a fine-grained microstructure. This parameter optimization allows the silver film to maintain both high light transmittance and low sheet resistance by preventing grain growth that would increase resistance while preserving optical transparency.
Solution Approach 2:
The patent creates a composite structure by combining silver with specific organic compounds (such as HAT-CN or tetracyanoquinodimethane) to form an organic-inorganic composite film. This composite approach allows the organic components to modify the electrical and optical properties of the silver, achieving simultaneous improvement in conductivity and transparency that neither material could achieve alone.
2Reliability
If a thick metal film is used to decrease sheet resistance, then conductivity is improved, but light transmittance deteriorates
Solution Approach 1:
The patent optimizes deposition parameters including substrate temperature, deposition rate, and ambient pressure to control the microstructure of the metal film. By maintaining lower deposition temperatures and controlled rates, the film develops a fine-grained structure that provides adequate conductivity without requiring excessive thickness, thereby preserving light transmittance.
Solution Approach 2:
The patent introduces organic compounds at specific locations and concentrations within the metal film structure to create localized regions with enhanced electrical properties. This local modification allows conductivity improvement in specific areas without increasing overall film thickness, thus maintaining optical transparency in other regions.
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 solution provides a transparent electrode with both high conductivity and transparency, enabling low driving voltage operation and improved color shift stability in electronic devices like organic electroluminescent elements.
Implementation Method 1
incorporating an organic functional layer containing specific organic compounds that promote a uniform film growth, preventing aggregation and ensuring high continuity and low sheet resistance
Data Source
AI summary
An object of the present invention is to provide a transparent electrode including a substrate having thereon a conductive layer containing silver as a main component, wherein the transparent electrode has an organic functional layer between the substrate and the conductive layer; and the organic functional layer contains a first organic compound represented by Formula (1) and a second organic compound having a different structure from a structure of the first organic compound,