Metal Alkoxide Precursor for CVD Thin Film Stability
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Solution Overview
Problem
Tetrakis-dialkylamide compounds exhibit poor thermal stability and productivity issues in thin film production, while tetrakis-alkoxide compounds have inadequate decomposition during film deposition, limiting their effectiveness as precursors in CVD processes for titanium, zirconium, and hafnium-based thin films.
Innovation Solution
A metal alkoxide compound with a specific structure, represented by the general formula M(OR1 to R8)4, where each R is independently a hydrogen atom or a methyl group, and M is titanium, zirconium, or hafnium, offering improved thermal stability and decomposition properties, suitable for use in CVD processes such as ALD.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tetrakis-dialkylamide compounds are used as precursors, then metal atoms can be supplied for thin film formation, but thermal stability deteriorates and decomposition control becomes difficult
Solution Approach 1:
The patent changes the chemical parameters of the precursor by replacing dialkylamide ligands with specific alkoxide ligands (methoxide, ethoxide, isopropoxide, tert-butoxide) coordinated to titanium, zirconium, or hafnium centers. This parameter change in ligand type and metal center combination achieves both thermal stability and controlled decomposition at appropriate temperatures for CVD processes
Solution Approach 2:
The patent creates composite precursor molecules combining specific metal centers (Ti, Zr, Hf) with specific alkoxide ligands. These composite molecular structures exhibit synergistic properties where the metal-alkoxide combination provides both thermal stability during storage/transport and controlled decomposition during film deposition, resolving the contradiction between reliability and productivity
2Reliability
If tetrakis-alkoxide compounds are used as precursors, then thermal stability improves, but decomposition during film deposition becomes insufficient and productivity decreases
Solution Approach 1:
The patent applies local quality by selecting different alkoxide ligands (methoxide, ethoxide, isopropoxide, tert-butoxide) with specific local chemical properties around the metal center. Each ligand type provides localized electronic and steric effects that facilitate controlled decomposition at deposition temperatures while maintaining overall molecular thermal stability during handling
Solution Approach 2:
The patent changes the decomposition temperature parameter by selecting appropriate metal-alkoxide combinations. The specific parameter optimization allows decomposition to occur at controlled temperatures during CVD processes, ensuring both thermal stability during storage and sufficient reactivity during film formation, thereby resolving the productivity issue
3Manufacturing precision
If conventional precursors are used in CVD processes, then thin films can be formed, but composition control and film quality deteriorate due to inadequate decomposition
Solution Approach 1:
The patent optimizes the decomposition temperature parameter by selecting specific metal-alkoxide combinations that decompose at controlled temperatures during CVD processes. This parameter control ensures complete decomposition for pure film composition while maintaining productivity through efficient deposition rates, directly addressing both manufacturing precision and film quality requirements
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 alkoxide compound ensures favorable decomposition, thermal stability, and high vapor pressure, enhancing the production of titanium, zirconium, and hafnium-based thin films, particularly in CVD processes, with improved productivity and film quality.
Implementation Method 1
a vapor that is obtained by vaporizing the material for forming a thin film and contains the metal alkoxide compound
Implementation Method 2
the decomposition is easily progressed by thermal and/or chemical reaction
Implementation Method 3
the decomposition is easily progressed by thermal and/or chemical reaction
Implementation Method 4
chemical vapor deposition, or the like
Data Source
AI summary
A metal alkoxide compound represented by the following general formula (1),wherein each of R1 to R8 is independently a hydrogen atom or a methyl group; M is a titanium, a zirconium or a hafnium atom.