Low Toxicity Organic Amines for Semiconductor Processing
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Solution Overview
Problem
Current semiconductor processing and cleaning compositions often rely on tetramethylammonium hydroxide (TMAH), a highly toxic compound, for which safer alternatives are needed to reduce toxicity and improve processing efficiency.
Innovation Solution
Development of compounds of Formula I and Formula II, which can serve as substitutes for TMAH in semiconductor processing, offering reduced toxicity and versatility as catalysts or phase transfer agents, and are used in compositions for electronics processing, cleaning, and degreasing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If TMAH is used in semiconductor processing, then processing effectiveness is maintained, but toxicity increases
Solution Approach 1:
The patent modifies the chemical structure of TMAH by changing parameters such as replacing methyl groups with other alkyl groups (ethyl, propyl, butyl), introducing hydroxyl groups, and varying the degree of quaternization to create compounds with reduced toxicity while maintaining processing effectiveness. This is evident in the systematic exploration of Formula I and Formula II compounds with different R groups and substitution patterns.
Solution Approach 2:
The patent creates composite amine structures combining different functional groups (amine, ammonium, hydroxyl, ether) within single molecules to achieve both low toxicity and high processing effectiveness. The compounds integrate multiple functional moieties that work synergistically to provide the desired performance characteristics.
2Object-affected harmful factors
If alternative compounds to TMAH are developed, then toxicity is reduced, but processing performance may be compromised
Solution Approach 1:
The patent systematically varies chemical parameters including alkyl chain length (C1-C6), hydroxyl group positions, and amine-to-ammonium ratios to optimize both toxicity reduction and processing efficiency. The embodiments demonstrate that specific parameter ranges achieve superior performance in cleaning and etching operations.
Solution Approach 2:
The developed compounds serve multiple functions simultaneously: they act as cleaning agents, etchants, and process control agents in semiconductor manufacturing. The amine and ammonium groups provide both surfactant properties for cleaning and chemical reactivity for etching, eliminating the need for separate processing steps.
3Object-affected harmful factors
If TMAH is replaced with alternative compounds, then safety is improved, but versatility in applications may be reduced
Solution Approach 1:
The patent describes compounds that can be used across multiple semiconductor processing applications including photoresist stripping, metal etching, oxide removal, and surface cleaning. The structural diversity within Formula I and Formula II allows tailoring compounds for specific applications while maintaining a unified chemical framework.
Solution Approach 2:
The patent introduces specific functional groups at strategic positions within the molecular structure to enhance performance for particular applications. For example, hydroxyl groups at specific positions improve cleaning efficacy, while certain alkyl substitutions enhance etching selectivity, allowing localized optimization of properties.
Data Source
AI summary
Tertiary amine and quaternary ammonium compounds of Formula I and/or Formula II are provided. The present technology also provides compositions that include one or more of the compounds that may be useful for electronics processing (e.g., semiconductor processing composition), cleaning, stripping, degreasing, or a combination of two or more thereof. The compounds of Formula I and/or Formula II may be useful as a low toxicity substitute for tetramethylammonium hydroxide.