Ionic Metal-Fluoride Thin Films via Plasma-Enhanced ALD
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Solution Overview
Problem
Existing thin film deposition methods, particularly in semiconductor manufacturing, face challenges in producing high-quality metal-fluoride thin films efficiently and cost-effectively, with issues such as impurities, non-homogeneous films, and increased manufacturing costs due to separate reaction chambers for ALD processes.
Innovation Solution
A plasma-enhanced atomic layer deposition method involving sequential exposure of substrates to metal-containing precursors and a plasma generated from oxygen- and fluorine-containing compounds, utilizing sputtering or reactive sputtering, to form ionic metal-fluoride thin films with reduced impurities and improved homogeneity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional ALD processes are used to deposit metal-fluoride thin films, then the films can be formed with controlled composition, but the films contain impurities and exhibit non-homogeneous properties
Solution Approach 1:
The patent changes the fundamental parameters of the deposition process by introducing plasma as an energy source and using sequential exposure to metal-containing precursors and fluorine-containing gases. This transforms the conventional thermal ALD process into a plasma-enhanced process that produces homogeneous ionic metal-fluoride films with reduced impurities through controlled radical reactions and surface reactions.
Solution Approach 2:
The patent replaces conventional thermal field-based ALD with plasma-based deposition, substituting thermal energy with plasma energy to drive the deposition process. This substitution enables more efficient and controlled formation of metal-fluoride films with improved homogeneity and reduced impurities through plasma-induced radical reactions.
2Manufacturing precision
If separate reaction chambers are used for ALD processes, then high-quality thin films can be produced, but manufacturing costs increase
Solution Approach 1:
The patent merges the ALD process with plasma generation capabilities into a single integrated reaction chamber system. By combining the metal-containing precursor delivery, fluorine-containing gas supply, and plasma generation functions within one chamber, the patent eliminates the need for separate reaction chambers while maintaining high thin film quality and reducing manufacturing costs.
3Device complexity
If plasma processes are integrated within existing ALD systems, then manufacturing costs are reduced, but process complexity increases
Solution Approach 1:
The patent designs the integrated system to perform multiple functions within a single reaction chamber: delivering metal-containing precursors, supplying fluorine-containing gases, generating plasma, and depositing thin films. This multi-functional design simplifies the overall system architecture while enabling cost-effective manufacturing of high-quality metal-fluoride thin films.
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 method produces high-quality, homogeneous ionic metal-fluoride thin films with reduced impurities and improved adhesion, density, and stoichiometry, reducing manufacturing costs by integrating plasma processes within existing ALD systems.
Implementation Method 1
a plasma generated from a mixture of process gases comprising one or more gaseous oxygen-containing compounds and one or more gaseous fluorine-containing compounds
Implementation Method 2
utilizing sputtering or reactive sputtering
Implementation Method 3
A first step results in some of the metal-containing precursor adsorbing on the substrate as an adsorbed metal-containing precursor
Implementation Method 4
The metal of the metal-containing precursor preferentially forms an ionic bond with fluorine over a covalent bond
Implementation Method 5
exposing the substrate to a plasma generated from a mixture of process gases comprising one or more gaseous oxygen-containing compounds
Data Source
AI summary
This disclosure relates to methods for depositing metal-fluoride thin films. In particular, process steps, precursors, and conditions are discussed herein for the formation of ionic metal-fluoride thin films. Barrier films composed of ionic metal-fluoride thin films are also discussed herein.