Screen-Printed Etching for Nanowire Transparent Conductors
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Solution Overview
Problem
Current transparent conductors, such as metal oxide films and conductive polymers, face limitations in terms of mechanical fragility, high production costs, and difficulty in adhering to flexible substrates like plastics, while also requiring expensive patterning processes and having lower conductivity and higher optical absorption.
Innovation Solution
A patterned transparent conductor is developed using a conductive layer of metal nanowires coated on a substrate, where a screen-printable etchant formulation with acids, acid-resistant polymers, and polar solvents is applied to pattern the conductor, allowing for low-cost, high-throughput manufacturing and patterning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vacuum deposited metal oxide films are used, then optical transparency and electrical conductivity are achieved, but mechanical fragility and adhesion to flexible substrates worsen
Solution Approach 1:
The patent uses metal nanowires embedded in a polymer matrix to create a composite transparent conductor. The metal nanowires provide electrical conductivity while the polymer matrix provides mechanical flexibility and adhesion to flexible substrates, resolving the contradiction between electrical performance and mechanical strength
Solution Approach 2:
The patent changes the material parameters from traditional metal oxides to metal nanowires with specific dimensions (diameter 1-100 nm, length 1-100 μm) and controls the nanowire network density and interconnection to achieve desired conductivity while maintaining mechanical flexibility
2Reliability
If vacuum deposition process is used, then transparent conductor is formed, but manufacturing cost and process complexity increase
Solution Approach 1:
The patent replaces the vacuum deposition mechanical system with a solution-based coating process where metal nanowire suspensions are applied to substrates and dried to form conductive films, eliminating the need for expensive vacuum equipment and simplifying manufacturing
Solution Approach 2:
The patent uses inexpensive metal nanowire suspensions that can be applied via simple coating methods and dried to form functional layers, replacing expensive vacuum-deposited metal oxide films with a low-cost, high-throughput manufacturing approach
3Manufacturing precision
If photolithography patterning is used, then circuits are formed, but manufacturing cost and process complexity increase
Solution Approach 1:
The patent applies etchant formulations selectively to specific regions of the transparent conductor to create patterns with different conductivity levels, allowing circuit formation through localized modification rather than complete removal of material
Solution Approach 2:
The patent uses screen printing to deposit etchant formulations that selectively remove or modify metal nanowires in patterned regions, creating conductive and insulating areas through controlled chemical etching rather than photolithographic patterning
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
This solution provides transparent conductors with improved electrical, optical, and mechanical properties, enabling adaptability to various substrates and efficient patterning without the need for expensive processes, while maintaining optical clarity and conductivity.
Implementation Method 1
screen-printing an acidic etchant on the transparent conductor according to a pattern; and (3) providing a patterned transparent conductor by etching according to the pattern
Data Source
AI summary
A patterned transparent conductor including a conductive layer coated on a substrate is described. More specifically, the transparent conductor can be patterned by screen-printing an acidic etchant formulation on the conductive layer. A screen-printable etchant formulation is also disclosed.