Nickel Cobalt Precursor Diazabutadiene Ligand Stability Reactivity
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Solution Overview
Problem
Current nickel and cobalt organometallic precursors for vapor deposition lack thermal stability and reactivity, leading to low thin-film growth rates and increased impurities, making them unsuitable for high-temperature applications in ALD and CVD processes.
Innovation Solution
Development of novel nickel and cobalt compounds using diazabutadiene ligands, which provide superior thermal stability and reactivity, reducing residue formation and enabling uniform thin-film deposition with improved step coverage and thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If alkoxide-based ligands are used as precursors, then the precursor structure is simple and easy to manufacture, but the thin-film growth rate is low due to low reactivity with oxidative reaction gases
Solution Approach 1:
The patent changes the ligand type from alkoxide to amido-based ligands, fundamentally altering the chemical parameters of the precursor. This parameter change increases reactivity with oxidative reaction gases, thereby improving thin-film growth rate while maintaining manufacturing feasibility through established synthesis routes.
Solution Approach 2:
The patent creates composite organometallic precursors by combining metal centers (Ni or Co) with specifically designed amido-based ligands containing alkyl groups. This composite structure achieves both high reactivity for fast film growth and thermal stability, resolving the contradiction between manufacturing simplicity and productivity.
2Productivity
If amido-based ligands are used as precursors, then the thin-film growth rate is improved, but thermal decomposition occurs at high temperatures of 200°C or more due to reactivity of the central metal with the alkyl group
Solution Approach 1:
The patent applies local quality by strategically placing electron-donating alkyl groups at specific positions on the amido-based ligand structure. This localized modification stabilizes the metal-ligand bond at high temperatures while preserving the high reactivity needed for fast thin-film growth, thus resolving the thermal decomposition issue.
Solution Approach 2:
The patent modifies the chemical parameters of the amido-based ligand by introducing electron-donating alkyl groups, which changes the electronic properties and steric environment around the metal center. This parameter change enhances thermal stability by strengthening the metal-ligand bond, preventing decomposition at temperatures above 200°C while maintaining high growth rates.
3Stability of the object's composition
If β-diketonate-based ligands are used as precursors, then the precursor structure is stable, but the volatility is low which limits vapor deposition efficiency
Solution Approach 1:
The patent changes the ligand class from β-diketonate to amido-based ligands with alkyl groups, fundamentally altering the physical and chemical parameters. This parameter change increases volatility by reducing the strength of intermolecular interactions, enabling efficient vapor deposition while maintaining structural stability through the robust metal-amido bond.
4Stability of the object's composition
If diamino-based ligands are used as precursors, then the ligand structure provides chelating stability, but the ligand dissociation rate is low due to interaction with reaction gas from the chelating structure
Solution Approach 1:
The patent changes the ligand type from diamino-based chelating ligands to amido-based ligands with alkyl groups. This parameter change modifies the coordination chemistry, allowing for controlled ligand dissociation rates that are optimized for vapor deposition processes while maintaining sufficient stability during storage and handling.
5Adaptability or versatility
If amino-alcohol-based ligands are used as precursors, then the ligand provides functional versatility, but the volatility is reduced and the melting point is raised which hinders vapor deposition
Solution Approach 1:
The patent changes the ligand class from amino-alcohol-based to amido-based ligands with alkyl groups, fundamentally altering the physical parameters. This parameter change increases volatility and lowers melting point by replacing hydrogen-bonding functional groups with hydrophobic alkyl-substituted amido groups, enabling efficient vapor deposition while retaining functional versatility through ligand design.
6Adaptability or versatility
If alkyl- and aryl-based ligands are used as precursors, then the ligand provides structural diversity, but the thermal stability is poor leading to decomposition
Solution Approach 1:
The patent creates composite ligand structures by combining the structural diversity of alkyl and aryl groups with the thermal stability of the amido functional group. This composite approach allows for varied molecular structures and properties while the amido moiety provides robust thermal stability, preventing decomposition and enabling high-temperature vapor deposition processes.
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 new compounds enable high-temperature thin-film deposition with reduced residue and improved film properties, suitable for ALD and CVD processes, enhancing the performance of thin-film characteristics and industrial applications such as fuel cells and secondary batteries.
Implementation Method 1
a vapor deposition compound enabling thin-film deposition through vapor deposition
Implementation Method 2
a vapor deposition compound enabling thin-film deposition through vapor deposition, and particularly to nickel and cobalt precursors capable of being applied to atomic layer deposition (ALD) or chemical vapor deposition (CVD)
Data Source
AI summary
The present invention relates to a vapor deposition compound enabling thin-film deposition through vapor deposition, and particularly to nickel and cobalt precursors capable of being applied to atomic layer deposition (ALD) or chemical vapor deposition (CVD) and having superior thermal stability and reactivity, and a method of preparing the same.