Acetone Dimethylhydrazone Metal Complexes for CVD and ALD
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Solution Overview
Problem
Current metal precursors for gas-phase thin-film deposition methods, such as CVD and ALD, face issues with thermal stability, volatility, synthetic accessibility, and high carbon and impurity incorporation rates, making them unsuitable for high deposition rates and precise metallization of substrate surfaces.
Innovation Solution
Development of metal complexes with acetone dimethylhydrazone ligands that are designed to be volatile, stable at higher temperatures, and easily synthesizable, featuring specific metal atoms and ligands that facilitate reductive elimination, thereby improving their suitability for gas-phase thin-film methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If thermally stable metal complexes are used as precursors, then the precursors can be stored and handled easily, but the deposition rates are limited and decomposition temperatures are too high
Solution Approach 1:
The patent modifies the ligand parameters by introducing acetone dimethylhydrazone with specific steric and electronic properties, changing the thermal stability parameter to achieve optimal balance between stability and reactivity. This allows the precursor to decompose at lower temperatures with higher rates, resolving the contradiction between thermal stability and deposition rate.
2Quantity of substance
If known metal precursors are used, then metal deposition can be achieved, but carbon and impurity incorporation rates are excessively high
Solution Approach 1:
The patent applies local quality by designing the acetone dimethylhydrazone ligand with specific local chemical environments that favor metal release while minimizing carbon incorporation. The ligand structure creates localized reaction zones that promote clean metal deposition, reducing harmful impurity incorporation while maintaining effective metal delivery.
3Ease of manufacture
If precursors with weakly-bound ligands are used, then ligand separation is easy, but the complexes are unsuitable for ALD processes due to preferred separation of only weakly-bound ligands
Solution Approach 1:
The patent employs dynamics by designing ligands with tunable binding strengths that can adapt to different process conditions. The acetone dimethylhydrazone ligand exhibits dynamic binding characteristics that allow controlled separation - strong enough for stable precursor formation but weak enough for clean ligand removal during ALD, ensuring both ease of manufacture and process reliability.
4Quantity of substance
If synthesis routes for metal precursors involve many steps or harsh conditions, then the precursors can be produced, but synthetic accessibility is too low and yields are reduced
Solution Approach 1:
The patent applies preliminary action by pre-synthesizing the acetone dimethylhydrazone ligand through a simple, high-yield route before complex formation. This preliminary preparation allows the subsequent metal complex synthesis to proceed in fewer steps with milder conditions, improving overall synthetic accessibility and yield while maintaining adequate precursor production.
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 metal complexes achieve high volatility, stability, and low impurity incorporation, enabling efficient and precise metallization of substrate surfaces with reduced decomposition temperatures and improved synthetic accessibility, making them suitable for industrial-scale production.
Implementation Method 1
The precursors should decompose exothermically under typical conditions of gas-phase thin-film methods—in particular, at elevated temperatures
Implementation Method 2
Complexes of acetone dimethylhydrazone ligands with other metals can undergo an unwanted reductive elimination of the acetone dimethylhydrazone ligands
Data Source
AI summary
Metal complexes of formula (I) are described:[M(L1)x(L2)y(hydra)z]n formula (I)wherein:M=metal atom having an atomic number selected from the ranges a) through c):a) 12, 21 to 34, with the exception of 30,b) 39 to 52, with the exception of 48,c) 71 to 83, with the exception of 80,L1=neutral or anionic ligand, with x=0 or 1,L2=neutral or anionic ligand, with y=0 or 1,(hydra)=acetone dimethylhydrazone monoanion, with z=1, 2, or 3,n=1 or 2, andthe total charge of the complex is 0.