Substrate Moisturizing Before Plating to Improve Wettability
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Solution Overview
Problem
Poor wettability of substrates during electrochemical plating processes leads to missing metal defects and oxidation issues, which are not adequately addressed by existing methods such as nitrogen-filled FOUPs, hydrogen environments, and hydrogen plasma processes, causing non-uniform plating and defects in active device areas.
Innovation Solution
Implementing a moisturizing process using natural or controlled environments to increase substrate wettability by exposing the substrate to moisture immediately before plating, utilizing methods such as humidified nitrogen, water vapor, or controlled humidity to adsorb moisture onto the substrate surface, thereby reducing oxidation and improving wetting behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If substrates are stored in nitrogen-filled FOUPs or hydrogen environments to prevent oxidation, then substrate oxidation is reduced, but substrate wettability deteriorates causing missing metal defects
Solution Approach 1:
The substrate surface is pre-treated with oxygen plasma immediately before plating to enhance wettability. This preliminary action prepares the surface for optimal plating adhesion and uniformity, resolving the wettability issue caused by storage in nitrogen or hydrogen environments without requiring changes to the storage conditions themselves.
2Reliability
If substrates are exposed to moisture immediately before plating to improve wettability, then missing metal defects are reduced, but substrate oxidation may increase
Solution Approach 1:
Oxygen plasma treatment is applied as a preliminary step immediately before plating to enhance surface wettability through controlled oxidation. This creates a hydrophilic surface layer that promotes uniform plating while the subsequent rapid plating process prevents excessive oxidation of the underlying metal layers.
Solution Approach 2:
The plasma treatment parameters (power, pressure, duration) are optimized to achieve the desired balance between wettability enhancement and oxidation control. By precisely controlling these parameters, the surface is made sufficiently wettable for uniform plating while limiting oxidation to acceptable levels that do not compromise the substrate.
3Productivity
If queue time between seeding and plating is extended, then process flexibility is improved, but plating uniformity deteriorates due to oxidation
Solution Approach 1:
Oxygen plasma treatment is applied immediately before plating regardless of queue time duration, ensuring consistent surface wettability and plating uniformity. This preliminary surface preparation step compensates for any oxidation that may have occurred during extended queue times, allowing flexible scheduling without compromising plating quality.
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
Significantly reduces missing metal defects and improves plating uniformity by ensuring proper wetting, enhancing the quality of electrochemical deposition processes and reducing substrate oxidation effects.
Implementation Method 1
exposing the substrate to moisture immediately before plating, utilizing methods such as humidified nitrogen, water vapor, or controlled humidity to adsorb moisture onto the substrate surface
Implementation Method 2
an electrochemical deposition process is commonly used for the metallization of an integrated circuit
Data Source
AI summary
Various embodiments include methods and apparatuses to moisturize a substrate prior to an electrochemical deposition process. In one embodiment, a method to control substrate wettability includes placing a substrate in a pre-treatment chamber, controlling an environment of the pre-treatment chamber to moisturize a surface of the substrate; and placing the substrate into a plating cell. Other methods and systems are disclosed.