Polyamine Quaternary Ammonium Hydroxide for Safe Etching
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Solution Overview
Problem
Current ammonium hydroxides used in etching, cleaning, and pattern developing for electronic devices are toxic, odor-prone, and can decompose to form colored solutions, necessitating the development of safer alternatives that maintain effectiveness.
Innovation Solution
A quaternary ammonium hydroxide solution is created by reacting a polyamine with an organic oxirane, offering high reactivity, low toxicity, and minimal odor, with adjustable reactivity for specific applications on metallic and dielectric surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tetramethylammonium hydroxide is used for etching, cleaning, and pattern developing, then high effectiveness is achieved, but high toxicity to the nervous system occurs
Solution Approach 1:
The patent changes the chemical structure parameters of the ammonium hydroxide by using polyamines with specific molecular weights (100-500 Da) and reacting them with oxirane compounds to form quaternary ammonium hydroxides with modified properties that reduce toxicity while maintaining effectiveness
Solution Approach 2:
The patent creates composite quaternary ammonium hydroxide compounds by combining polyamines with oxirane compounds, resulting in a new class of chemicals that integrates the beneficial properties of both components while eliminating the harmful toxicity associated with traditional tetramethylammonium hydroxide
2Object-affected harmful factors
If choline hydroxide is used as an alternative to tetramethylammonium hydroxide, then low toxicity is achieved, but serious odor problems and decomposition into colored solutions and precipitates occur
Solution Approach 1:
The patent modifies the chemical parameters by using polyamines with specific molecular weights and structures that prevent the odor and decomposition problems associated with choline hydroxide, while maintaining the low toxicity benefit
Solution Approach 2:
The patent develops quaternary ammonium hydroxides that are stable and do not decompose into colored solutions and precipitates like choline hydroxide, providing a more durable and reliable alternative that maintains its properties throughout use
3Reliability
If traditional ammonium hydroxides are used for cleaning and processing, then effective removal of chemical residues is achieved, but toxic and flammable characteristics are present
Solution Approach 1:
The patent changes the chemical composition parameters by using polyamines with specific molecular weights (100-500 Da) that create quaternary ammonium hydroxides with reduced toxicity and flammability while maintaining cleaning effectiveness
Solution Approach 2:
The patent replaces the traditional harmful chemical system with a new quaternary ammonium hydroxide system that achieves the same cleaning function through different chemical mechanisms that are safer and more environmentally friendly
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 quaternary ammonium hydroxide solution effectively removes chemical residues from surfaces, is non-toxic and odor-free, and can be tailored for various reaction rates and surface types, enhancing the safety and efficiency of electronic device manufacturing processes.
Implementation Method 1
a quaternary ammonium hydroxide solution comprising a reaction product of (i) a polyamine and (ii) an organic oxirane
Data Source
AI summary
The present disclosure provides a quaternary ammonium hydroxide solution comprising a reaction product of a polyamine and an organic oxirane. The quaternary ammonium hydroxide solution may be used in various applications, such as in removing chemical residue from a metal or dielectric surface.