Group 4 Metal Precursor Thermal Stability Vapor Deposition
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Solution Overview
Problem
There is a need for thermally stable Group 4 transition metal compounds suitable for vapor phase thin film deposition with controlled thickness and composition at high temperatures, as existing materials lack stability and precise control in these conditions.
Innovation Solution
The development of Group 4 transition metal-containing film forming compositions comprising precursors with the formula L2-M-C5R4-[(ER2)2—NR]—, where M is Ti, Zr, or Hf bonded in an η5 bonding mode to the Cp group, and E can be C, Si, or P, with specific ligands such as NR′2, OR′, amidinate, β-diketonate, or keto-iminate, to facilitate controlled deposition of high-quality films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing Group 4 metal compounds are used as precursors for vapor phase deposition, then deposition can be performed, but the compounds lack thermal stability and precise control at high temperatures
Solution Approach 1:
The patent modifies the molecular structure of Group 4 metal compounds by changing ligand parameters - specifically using cyclopentadienyl (Cp) ligands with C1-C4 hydrocarbon substituents and unique bridging structures. These parameter changes in molecular composition and structure enhance thermal stability while maintaining volatility, enabling reliable vapor phase deposition at high temperatures where existing compounds fail.
Solution Approach 2:
The invention creates composite molecular structures combining Group 4 metals (Ti, Zr, Hf) with organometallic ligands including cyclopentadienyl rings, hydrocarbon groups, and bridging moieties. This composite molecular design integrates multiple functional components that collectively provide both thermal stability and controlled volatility, resolving the contradiction between stability and deposition capability at high temperatures.
2Manufacturing precision
If conventional precursors are used, then deposition process can proceed, but precise control over film thickness and composition is not achieved
Solution Approach 1:
The patent achieves precise control over film thickness and composition by carefully adjusting molecular parameters of the precursor - including the type of hydrocarbon substituents (C1-C4 groups), the specific bridging structure, and ligand configuration. These parameter changes enable controlled decomposition and deposition rates, allowing precise film control while maintaining process simplicity through single-source precursor design.
3Reliability
If Group 4 metal compounds with high thermal stability are designed, then stability is improved, but volatility for vapor phase deposition may be reduced
Solution Approach 1:
The patent applies local quality by differentiating functional regions within the molecular structure: the cyclopentadienyl metal core provides thermal stability, while the hydrocarbon substituents (C1-C4 groups) and bridging structures are optimized for volatility and vapor phase transport. This spatial differentiation of molecular properties allows simultaneous achievement of both thermal stability and adequate volatility for deposition.
Solution Approach 2:
The invention balances stability and volatility by adjusting molecular parameters - specifically the size and type of hydrocarbon groups (methyl, ethyl, propyl, butyl options), the bridging moiety structure, and ligand configuration. These parameter changes fine-tune the relationship between thermal stability and vapor pressure, enabling compounds that are stable at deposition temperatures yet sufficiently volatile for effective vapor phase delivery.
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
These compositions enable the deposition of high-quality, thermally stable Group 4 transition metal films with precise control over thickness and composition, suitable for advanced semiconductor applications, including high-k dielectrics and diffusion barriers, by using vapor deposition processes like CVD and ALD.
Implementation Method 1
deposition of Group 4 transition metal-containing films on one or more substrates via vapor deposition processes
Implementation Method 2
deposition of Group 4 transition metal-containing films on one or more substrates via vapor deposition processes like CVD and ALD
Data Source
AI summary
Group 4 transition metal-containing film forming compositions are disclosed. The Group 4 transition metal-containing film forming compositions comprise Group 4 transition metal precursors having the formula L2-M-C5R4-[(ER2)2—NR]—, wherein M is Ti, Zr, or Hf bonded in an η5 bonding mode to the Cp group; each E is independently C, Si, B or P; each R is independently a hydrogen or a C1-C4 hydrocarbon group; and each L is independently a −1 anionic ligand selected from the group consisting of NR′2, OR′, Cp, amidinate, β-diketonate, or keto-iminate, wherein R′ is a H or a C1-C4 hydrocarbon group and adjacent R′s may be joined to form a hydrocarbyl ring; provided that at least one R on the Cp is C1 to C4. Also disclosed are methods of synthesizing and using the disclosed precursors to deposit Group 4 transition metal-containing films on one or more substrates via vapor deposition processes.