Transparent Electrode Wire Structure Coating
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Solution Overview
Problem
Existing transparent electrodes for organic electroluminescent devices, typically made with indium tin oxide, face challenges in achieving low resistance while maintaining high light transmission and smoothness, often requiring high-temperature processing and being costly.
Innovation Solution
A transparent electrode is manufactured using a transparent substrate with a thin wire structure of conductive material and a multi-layer transparent conductive layer formed through coating or printing, utilizing conductive materials like polythiophene and polyaniline derivatives to achieve low surface resistivity and high transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thick and uniform film of transparent electrode material is formed to obtain low resistance, then electrical conductivity is improved, but light transmission is decreased
Solution Approach 1:
The transparent electrode is divided into a wire structure (mesh, comb, or grid shape) and a transparent conductive layer. The wire structure provides the primary electrical conductivity path, allowing the transparent conductive layer to be thinner while maintaining low resistance, thus preserving light transmission.
Solution Approach 2:
The transparent electrode combines a metal wire structure with a transparent conductive layer made of materials such as polythiophene, polyaniline, or their derivatives. This composite structure achieves low resistance through the conductive materials while maintaining high light transmission through the transparent nature of both components.
2Reliability
If conventional transparent electrode materials like ITO are used to achieve low resistance, then electrical conductivity is improved, but manufacturing cost increases
Solution Approach 1:
The invention replaces expensive indium tin oxide (ITO) with cheaper alternative materials such as polythiophene, polyaniline, and their derivatives. These materials can be deposited as thinner films, reducing material costs while achieving comparable or sufficient electrical conductivity when combined with the wire structure.
Solution Approach 2:
The invention changes the material parameters by using organic conductive polymers instead of inorganic oxides, and adjusts the film thickness parameter to be thinner than conventional ITO films, achieving cost reduction while maintaining functional performance.
3Reliability
If conventional transparent electrode processes are used to achieve low resistance, then electrical conductivity is improved, but high temperature processing is required
Solution Approach 1:
The invention changes the processing temperature parameter by using organic conductive polymer materials that can be deposited and cured at lower temperatures compared to conventional ITO sputtering or evaporation processes, enabling manufacturing on temperature-sensitive substrates.
4Reliability
If a transparent conductive layer is formed over a thin wire structure, then conductivity is improved, but the wire structure's shape may affect the uniformity of the conductive layer
Solution Approach 1:
The wire structure is formed first as a preliminary step, providing a stable foundation that guides the subsequent deposition of the transparent conductive layer. This sequence ensures that the conductive layer conforms to the wire structure while maintaining uniform thickness through controlled deposition processes.
Data Source
AI summary
A transparent electrode includes a transparent substrate, a thin wire structure partially covering a surface of the transparent substrate and formed of a conductive material, and a transparent conductive layer formed on the transparent substrate to cover the thin wire structure. The transparent conductive layer is formed of two or more separately prepared layers.