Coating Method for Uniform Substrate Coverage
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Solution Overview
Problem
Current coating methods face challenges in uniformly applying chemicals to substrates, especially those with depressions, leading to issues like 'film tear' and uneven film thickness, and struggle to effectively coat substrates with complex topographies.
Innovation Solution
A coating method involving a solvent supplying step where the substrate is rotated at controlled speeds and the solvent nozzle moves between central and peripheral positions to ensure uniform solvent distribution, followed by a chemical supplying step that utilizes the evenly spread solvent to apply the chemical uniformly, including into depressions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the substrate is at rest and solvent is dropped only to the center portion, then the solvent can be easily supplied, but the chemical cannot be uniformly applied to the entire substrate including peripheral portions
Solution Approach 1:
The substrate is rotated during the solvent supplying step at a controlled rotation speed, transforming the static coating process into a dynamic one. This rotation enables the solvent to be distributed uniformly across the entire substrate surface including peripheral portions, while maintaining ease of operation through automated rotation control
Solution Approach 2:
The solvent is supplied to the substrate before the chemical in a preliminary step, creating a uniform solvent layer that prepares the substrate surface. This preliminary solvent application ensures that when the chemical is subsequently applied, it can be uniformly distributed across the entire substrate including areas that would otherwise be difficult to reach
2Adaptability or versatility
If the substrate has depressions, then the chemical can enter some depressions, but it fails to enter other depressions uniformly causing film tear and uneven film thickness
Solution Approach 1:
Rotation of the substrate during solvent supply creates dynamic fluid motion that helps the solvent penetrate into depressions uniformly. The rotational motion generates centrifugal forces and fluid flow patterns that enable consistent chemical distribution into depression areas, preventing film tear and ensuring uniform film thickness
Solution Approach 2:
The rotation speed is controlled within a specific range to optimize the balance between centrifugal force and fluid penetration. By adjusting this parameter, the system achieves uniform chemical distribution into depressions while maintaining overall coating uniformity, resolving the contradiction between penetration and film thickness consistency
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 method ensures appropriate and uniform coating of substrates with chemicals, even on substrates with depressions, by using a controlled solvent distribution process that prevents uneven film thickness and enhances chemical penetration into all areas.
Implementation Method 1
a first step of rotating the substrate at a first rotation speed, moving a solvent nozzle between a central position above a center portion of the substrate and a peripheral position above a peripheral portion of the substrate, and dispensing the solvent from the solvent nozzle
Data Source
AI summary
A coating method of coating a substrate with a chemical includes a solvent supplying step and a chemical supplying step. In the solvent supplying step, a solvent is supplied to the substrate. After the solvent supplying step, the chemical is supplied to the substrate in the chemical supplying step. The solvent supplying step includes a first step. The first step causes the substrate to rotate at a first rotation speed, causes a solvent nozzle to move between a central position above a center portion of the substrate and a peripheral position above a peripheral portion of the substrate, and causes the solvent nozzle to dispense the solvent.