Silver Etching Composition for Display Devices
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Solution Overview
Problem
Existing etching compositions for silver-containing thin films in display device manufacturing often result in excessive etching rates, CD-skew, and the generation of etching residues, which can lead to manufacturing defects and instability over time, particularly when dealing with silver alloys and metal oxides like indium tin oxide.
Innovation Solution
An etching composition comprising specific ratios of inorganic acid compounds, carboxylic acid compounds, sulfonic acid compounds, glycol compounds, nitrogen-containing dicarbonyl compounds, and metal-based oxidizers, which selectively etches silver-containing thin films while preventing excessive etching rates and CD-skew, and minimizing damage to adjacent metal layers like aluminum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional etching compositions are used for silver-containing thin films, then etching can be performed, but excessive etching rates and CD-skew occur leading to manufacturing defects
Solution Approach 1:
The patent modifies the chemical composition parameters of the etching solution by incorporating specific organic compounds (carboxylic acids, sulfonic acids, nitrogen-containing dicarbonyl compounds) in controlled concentrations alongside inorganic acids. This parameter adjustment optimizes the etching rate while maintaining precision, preventing excessive etching and CD-skew that occur with conventional compositions.
Solution Approach 2:
The patent creates a composite etching composition by combining multiple types of acids (inorganic and organic) and additives in specific ratios. This composite formulation works synergistically to control the etching process, achieving both acceptable etching rates and high manufacturing precision without the defects associated with single-component etchants.
2Manufacturing precision
If conventional etching compositions are used, then etching process can proceed, but etching residues are generated causing manufacturing defects
Solution Approach 1:
The patent converts the potential harm of residue generation into a benefit by using organic compounds that form soluble complexes with etched materials. The carboxylic acids, sulfonic acids, and nitrogen-containing dicarbonyl compounds bind to metal ions and byproducts, keeping them in solution rather than allowing precipitation as residues, thus eliminating the harmful effect.
Solution Approach 2:
The patent changes the chemical environment parameters by introducing organic acids and chelating agents that alter the solubility and reactivity of etching byproducts. This parameter modification ensures that etching residues are prevented from forming, achieving clean etching surfaces.
3Reliability
If etching is performed on silver-containing thin films, then pattern formation is achieved, but instability over time occurs reducing reliability
Solution Approach 1:
The patent ensures continuous stability by using a buffered etching composition where organic acids and chelating agents continuously maintain the chemical environment. This continuous action prevents degradation of etching performance over time, maintaining consistent results throughout the etching process and across multiple batches.
Solution Approach 2:
The patent incorporates compounds that provide chemical feedback by buffering pH changes and metal ion concentrations during etching. The nitrogen-containing dicarbonyl compounds and carboxylic acids act as buffers that respond to changes in the etching environment, maintaining stable conditions that prevent drift in etching performance over time.
4Productivity
If aggressive etching is used to achieve fast etching rates, then productivity increases, but damage to adjacent metal layers like aluminum occurs
Solution Approach 1:
The patent applies local quality by creating a selectively reactive etching composition that targets silver-containing films while being gentle on adjacent aluminum layers. The organic acids and chelating agents are specifically chosen to have higher affinity and reactivity with silver compounds, creating a localized chemical environment that etches silver rapidly while leaving aluminum intact.
Solution Approach 2:
The patent changes the chemical selectivity parameters by adjusting the types and concentrations of organic acids and additives. This parameter optimization creates a chemical environment where the etching rate for silver is high while the reactivity toward aluminum is suppressed, achieving fast etching without cross-contamination damage.
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 composition effectively controls etching rates, prevents etching residues, and maintains stability over time, reducing manufacturing defects and improving the reliability of display devices by selectively etching silver-containing thin films without damaging adjacent metal layers.
Implementation Method 1
an inorganic acid compound, a carboxylic acid compound, a sulfonic acid compound, a glycol compound, a nitrogen-containing dicarbonyl compound, a metal-based oxidizer
Implementation Method 2
a carboxylic acid compound, a sulfonic acid compound, a glycol compound, a nitrogen-containing dicarbonyl compound
Data Source
AI summary
An etching composition for a silver-containing thin film includes an inorganic acid compound, a carboxylic acid compound, a sulfonic acid compound, a glycol compound, a nitrogen-containing dicarbonyl compound, a metal-based oxidizer, and water.