Pressurization-Type Metal Monoatomic Layer Deposition
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Solution Overview
Problem
Current methods for manufacturing nano-scale semiconductor devices face limitations in achieving high uniformity and low surface roughness due to high-temperature processing, which can degrade devices and hinder further miniaturization.
Innovation Solution
A pressurization type method and apparatus that involves sealing a chamber to maintain high pressure for metal precursor gas adsorption onto a substrate, followed by purging and reaction gas dosing to form elementary metal, with controlled pressure and temperature conditions to achieve high surface coverage and low surface roughness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-temperature processing is used to manufacture nano-scale semiconductor devices, then device fabrication can be achieved, but device performance deteriorates due to high-temperature heat and surface roughness increases
Solution Approach 1:
The patent changes the pressure parameter from conventional low-pressure conditions to high-pressure conditions (0.1-100 Torr) during metal precursor gas dosing. This parameter change enables the process to be conducted at low temperatures (below 200°C) while achieving high surface coverage and uniformity, thereby resolving the contradiction between manufacturing precision and temperature requirements
Solution Approach 2:
The patent utilizes the phase transition behavior of metal precursor gases under high-pressure conditions to enhance adsorption efficiency onto the substrate. The high-pressure environment facilitates the transition of metal precursor molecules into an adsorbed state on the substrate surface, enabling complete monolayer formation at low temperatures and preventing aggregation
2Manufacturing precision
If conventional ALD technique is used, then nano-scale thin layer deposition with good uniformity is achieved, but surface roughness increases and aggregation occurs
Solution Approach 1:
The patent employs a pressurization-type atomic layer deposition (PS-ALD) technique that replicates and enhances the conventional ALD process by introducing high-pressure conditions. This copying approach with modified parameters achieves complete monolayer coverage and prevents aggregation, thereby improving surface roughness while maintaining layer uniformity
Solution Approach 2:
The patent performs preliminary high-pressure dosing of metal precursor gas before the actual deposition reaction. This preliminary action ensures complete and uniform adsorption of metal precursors across the entire substrate surface, creating a uniform monolayer that prevents subsequent aggregation and reduces surface roughness
3Productivity
If device size is reduced through scaling down, then device integration is improved, but device performance deteriorates due to high-temperature heat generation
Solution Approach 1:
The patent changes the pressure parameter to high-pressure conditions, which fundamentally alters the deposition mechanism to enable low-temperature processing. This parameter change allows for continued device scaling and integration improvement without the harmful high-temperature heat generation that plagues conventional approaches
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 enables the formation of elementary metal with high uniformity and low surface roughness, suitable for nano-scale semiconductor devices, while preventing aggregation and maintaining process temperatures below 200°C.
Implementation Method 1
increasing a pressure in the chamber by providing a metal precursor gas consisting of metal precursors, thereby adsorbing the metal precursors onto the substrate
Implementation Method 2
providing a reaction gas to reduce the metal precursors adsorbed on the substrate to elementary metal
Data Source
AI summary
A pressurization type method for manufacturing elementary metal may include a metal precursor gas pressurization dosing operation of, in a state where an outlet of a chamber having a substrate is closed, increasing a pressure in the chamber by providing a metal precursor gas consisting of metal precursors, thereby adsorbing the metal precursors onto the substrate, a main purging operation of purging a gas after the metal precursor gas pressurization dosing operation, a reaction gas dosing operation of providing a reaction gas to reduce the metal precursors adsorbed on the substrate to elementary metal, after the main purging operation, and a main purging operation of purging a gas after the reaction gas dosing operation.