Substrate Coating via Gas-Assisted Fluid Distribution
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Solution Overview
Problem
In semiconductor device processing, the surface tension of fluids and trapped air in recesses formed by physical features on substrates prevent complete filling of these features during coating processes, leading to incomplete coverage and defects in device formation.
Innovation Solution
Introducing a gas that dissolves into the fluid and is introduced into the substrate environment, facilitating the distribution of the fluid and ensuring it fills the recesses, thereby enhancing the coating process and achieving uniform coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a fluid is applied to the substrate surface using conventional coating methods, then the coating process is simple and fast, but the fluid cannot completely fill the recesses due to surface tension and trapped air
Solution Approach 1:
The gas is introduced into the environment of the substrate surface before the fluid is applied. This preliminary action allows the gas to dissolve into the fluid and reduce surface tension in advance, enabling the fluid to completely fill the recesses when applied, without requiring complex post-processing steps.
Solution Approach 2:
A gas is introduced as an intermediary substance between the fluid and the recesses. The gas dissolves into the fluid and facilitates the distribution of the fluid into the recesses by reducing surface tension effects, acting as a mediator that enables complete filling without direct mechanical intervention.
2Productivity
If the fluid is applied quickly to maintain high productivity, then processing time is reduced, but air becomes trapped in recesses and prevents complete filling
Solution Approach 1:
The gas is introduced before fluid application to pre-condition the environment and the fluid itself. This allows the coating process to proceed quickly without sacrificing filling completeness, as the gas has already prepared the fluid to penetrate recesses effectively even at high processing speeds.
Solution Approach 2:
The physical-chemical parameters of the fluid are changed by dissolving gas into it, which modifies the surface tension and flow characteristics. This parameter change enables the fluid to maintain good distribution and complete filling even when applied rapidly, thus maintaining both productivity and precision.
3Manufacturing precision
If conventional coating methods are used without gas introduction, then the process is simple and fast, but the coating uniformity and quality are insufficient
Solution Approach 1:
The gas introduction step is performed before fluid application to pre-condition the system. This preliminary action ensures uniform coating quality by allowing the gas to dissolve into the fluid and eliminate surface tension barriers, while the entire process remains efficient due to the sequential rather than iterative nature of the steps.
Solution Approach 2:
The gas serves as an intermediary that improves coating uniformity by facilitating fluid distribution into recesses. Although an additional step is involved, the process remains relatively simple and fast because the gas introduction is a straightforward pre-treatment that enables subsequent rapid fluid application with superior uniformity.
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 allows for complete filling of recesses, improving the uniformity and quality of the coating, reducing processing times, and enhancing the efficiency of cleaning and etching processes, resulting in better device formation objectives.
Implementation Method 1
introducing a gas that dissolves into the fluid and is introduced into the substrate environment, facilitating the distribution of the fluid
Implementation Method 2
the surface tension of the fluid and because of air trapped in recesses formed by the physical features
Data Source
AI summary
Methods and systems for coating a substrate with a fluid are described. In an embodiment, a method may include receiving a substrate in a substrate processing unit, the substrate having one or more physical features formed on a surface of the substrate. The method may include introducing a gas into an environment of the surface of the substrate. Additionally, the method may include applying a fluid to the surface of the substrate, wherein the gas facilitates distribution of the fluid relative to the one or more physical features formed on the surface of the substrate. The method may further include controlling one or more processing parameters related to distribution of the fluid in order to achieve device formation objectives.