Selective Metal Oxide Deposition via Self-Assembled Monolayer Pretreatment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
As semiconductor device sizes decrease, the complexity and cost of manufacturing increase, and existing methods struggle with selective film deposition on different material surfaces, particularly in achieving precise patterned features and preventing metal oxide deposition on metal layers.
Innovation Solution
The method involves pretreating substrates with a reactant gas to form self-assembled monolayers (SAMs), allowing for selective deposition of metal oxide films on dielectric surfaces while preventing deposition on metal surfaces, using techniques like ALD and CVD, and utilizing a metal-containing catalyst layer with silanol gas to deposit SiO2 films without oxidizing or hydrolyzing agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional deposition methods are used, then film deposition occurs on all surfaces, but selective deposition on dielectric surfaces while preventing deposition on metal surfaces cannot be achieved
Solution Approach 1:
The patent applies preliminary action by forming self-assembled monolayers (SAMs) on metal surfaces before the deposition process. This pretreatment modifies the metal surface properties in advance, creating a barrier that prevents metal oxide deposition during subsequent deposition steps, while leaving dielectric surfaces unaffected and ready for selective film formation.
Solution Approach 2:
The self-assembled monolayers act as an intermediary layer between the metal surface and the deposition environment. These SAMs mediate the interaction by providing a chemically inert surface that resists metal oxide formation, thereby enabling selective deposition on dielectric surfaces without directly modifying the deposition process parameters.
2Manufacturing precision
If incubation time is extended on metal layers to prevent deposition, then selectivity improves, but processing time increases
Solution Approach 1:
By performing the SAM formation as a preliminary step before deposition, the metal surfaces are pre-conditioned to resist deposition. This eliminates the need for extended incubation times during the actual deposition process, as the selective barrier is already in place, thereby reducing total processing time while maintaining high selectivity.
3Manufacturing precision
If standard deposition conditions are used, then deposition occurs uniformly, but precise control over deposition location and thickness cannot be achieved
Solution Approach 1:
The patent applies local quality by creating surfaces with different chemical properties through selective SAM formation on metal surfaces only. This results in spatially varying deposition characteristics where dielectric surfaces promote film formation while metal surfaces with SAMs inhibit it, enabling precise control over deposition location without complex control systems.
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
This approach enhances selectivity in film deposition, improving line-to-line breakdown and electrical leakage performance by extending incubation times on metal layers and enabling fast deposition on dielectric surfaces, potentially reducing processing steps and costs.
Implementation Method 1
exposing the substrate to a reactant gas containing a molecule that forms self-assembled monolayers (SAMs) on the substrate
Implementation Method 2
exposing the substrate to a reactant gas containing a molecule that forms self-assembled monolayers (SAMs) on the substrate
Implementation Method 3
selectively depositing a metal oxide film on a surface of the dielectric layer relative to a surface of the metal layer by exposing the substrate to a deposition gas
Implementation Method 4
selectively depositing a metal oxide film on a surface of the dielectric layer relative to a surface of the metal layer by exposing the substrate to a deposition gas
Implementation Method 5
in the absence of any oxidizing and hydrolyzing agent, at a substrate temperature of approximately 150° C., or less, exposing the substrate to a process gas containing a silanol gas to selectively deposit a SiO2 film on the metal-containing catalyst layer
Data Source
AI summary
Embodiments of the invention provide methods for selective film deposition using a surface pretreatment. According to one embodiment, the method includes providing a substrate containing a dielectric layer and a metal layer, exposing the substrate to a reactant gas containing a molecule that forms self-assembled monolayers (SAMs) on the substrate, and thereafter, selectively depositing a metal oxide film on a surface of the dielectric layer relative to a surface of the metal layer by exposing the substrate to a deposition gas.