Substrate Humidification Control for Plating Wettability
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Solution Overview
Problem
In semiconductor device fabrication, the oxidation of the surface metal during electrochemical deposition leads to increased resistivity, non-uniformity, and 'missing metal' defects due to poor wettability, which existing methods struggle to prevent effectively.
Innovation Solution
A method involving a controlled humidification environment to moisturize the substrate surface with water vapor, optimizing relative humidity, pressure, and temperature conditions to improve wettability without condensation, followed by electroplating, using sensors and a throttle valve for precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the substrate surface is exposed to water vapor to improve wettability, then the plating quality improves, but condensed water may form on the surface causing defects
Solution Approach 1:
The patent applies parameter changes by precisely controlling temperature, relative humidity, and pressure parameters during the water vapor exposure process. By optimizing these parameters, the substrate surface achieves improved wettability for better plating quality while preventing the formation of condensed water that would cause defects.
Solution Approach 2:
The patent implements feedback control through sensors that monitor temperature, relative humidity, and pressure in real-time. This feedback mechanism allows the system to adjust the water vapor exposure conditions dynamically, ensuring that the substrate receives sufficient moisture for good wettability while preventing excessive moisture that would lead to condensation and plating defects.
2Manufacturing precision
If traditional humidification methods are used to moisturize the substrate, then wettability improves, but the process window is limited and defects increase
Solution Approach 1:
The patent expands the process window by implementing control over multiple parameters simultaneously - temperature, relative humidity, and pressure. This multi-parameter control approach provides greater flexibility and reliability compared to traditional single-parameter humidification methods, allowing the process to maintain stable wettability improvement across varying conditions.
Solution Approach 2:
The patent introduces dynamic control through real-time monitoring and adjustment of humidification parameters. The system can adaptively respond to changes in substrate conditions and environmental factors, maintaining optimal wettability enhancement while preventing defects through continuous parameter optimization.
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 enhances wettability, reduces defects, and expands the process window for electrochemical plating, ensuring consistent and efficient material deposition on semiconductor substrates.
Implementation Method 1
exposing an active surface of the substrate in the humidification environment to water vapor under conditions based on the relative humidity data, whereby the active surface of the substrate may be humidified without substantially forming condensed water on the active surface
Implementation Method 2
electroplating a material onto the active surface of the substrate
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 humidification environment, controlling the humidification environment to moisturize a surface of the substrate; and placing the substrate into a plating cell. Other methods and systems are disclosed.