Thin-Film Deposition Spray Layout for Source-Reaction Gas Separation
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Solution Overview
Problem
Conventional spatially separated atomic layer deposition methods face issues with gas mixing due to inadequate separation of source and reaction gases, leading to particle generation and difficulty in forming dense thin films.
Innovation Solution
A thin film deposition apparatus with a spray unit that includes partition walls and alternating spray sections to separate and exhaust source and reaction gases, utilizing a purging action by the reaction gas to prevent mixing and enhance film formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If source gas and reaction gas are sprayed simultaneously without adequate separation, then deposition rate increases, but gas mixing occurs causing particle generation and poor film density
Solution Approach 1:
The deposition chamber is segmented into distinct source gas spray region and reaction gas spray region using partition walls. The source gas is sprayed in one section while the reaction gas is sprayed in a separate section, preventing direct mixing of the two gases. This spatial segmentation allows simultaneous spraying at high rates without compromising film density, as each gas maintains its designated zone until the deposition process completes.
2Reliability
If conventional air curtain is used to separate source gas and reaction gas, then some separation is achieved, but gas mixing still occurs due to inadequate separation
Solution Approach 1:
Partition walls are introduced as physical intermediaries between the source gas spray section and reaction gas spray section. These partition walls create a robust physical barrier that effectively separates the two gas streams, preventing mixing issues that plague air curtain methods. The partition walls serve as a reliable mediator that maintains gas separation without requiring complex flow control mechanisms.
3Reliability
If additional purging and exhaust configurations are added to prevent gas mixing, then gas separation improves, but device complexity increases
Solution Approach 1:
The partition walls simultaneously serve multiple functions: they separate the source gas and reaction gas zones, provide structural support for the spray nozzles, and guide the exhaust flow. By merging these functions into a single structural element, the design achieves effective gas separation without adding separate purging and exhaust configurations, thereby maintaining device simplicity while improving reliability.
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
Prevents gas mixing, eliminates the need for additional purging and exhaust configurations, and enables the formation of dense thin films by effectively separating and purging source and reaction gases.
Implementation Method 1
the second spray section is configured to spray a reaction gas and form a plasma on the one surface of the substrate
Implementation Method 2
physical vapor deposition (PVD), which utilizes physical collisions, such as sputtering
Data Source
AI summary
A thin film deposition apparatus includes: a support, which supports a substrate; and a spray unit including a first spray section and a second spray section arranged along a first direction parallel to a major surface of the support. In the spray unit, the first spray section is configured to spray a source gas onto one surface of the substrate and exhaust the source gas, and the second spray section is configured to spray a reaction gas onto the one surface of the substrate and form a plasma. The reaction gas sprayed from the second spray section flows over the one surface of the substrate and is exhausted through the first spray section.