Wafer Bonding Humidity Control for Nano-FET Substrate Quality
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Solution Overview
Problem
As the semiconductor industry continues to reduce minimum feature sizes, challenges arise in maintaining integration density and improving bonding quality between semiconductor wafers, particularly in forming high-quality semiconductor substrates for nano-FETs.
Innovation Solution
A wafer bonding system is employed to bond a first semiconductor wafer to a second semiconductor wafer in a controlled humidity environment, forming a semiconductor substrate suitable for nano-FETs. This system includes surface treatment and bonding processes to ensure optimal bonding quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If minimum feature sizes are reduced to improve integration density, then more components can be integrated into a given area, but bonding quality between semiconductor wafers deteriorates
Solution Approach 1:
The patent applies parameter changes by controlling the relative humidity environment during wafer bonding. Specifically, maintaining relative humidity between 20-70% (optimally 35-60% or 39-45%) during the bonding process improves bond quality and reduces defects like edge bubbles and non-bonded edges, thereby resolving the deterioration of bonding quality that occurs when minimum feature sizes are reduced for higher integration density.
2Device complexity
If conventional wafer bonding is performed without humidity control, then the bonding process is simpler, but edge bubble defects and non-bonded wafer edges increase
Solution Approach 1:
The patent introduces relative humidity as a controlled parameter during wafer bonding, maintaining it within 20-70% (optimally 35-60% or 39-45%). This parameter control significantly reduces edge bubble defects and non-bonded wafer edges, improving manufacturing precision while adding manageable complexity through humidity monitoring and control systems.
Solution Approach 2:
The patent implements feedback control by monitoring relative humidity during the bonding process and adjusting the environment accordingly. The system uses humidity sensors and control mechanisms to maintain humidity within the optimal range, ensuring consistent bonding quality and reducing defects through real-time feedback adjustment.
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
The controlled humidity environment improves bonding quality and run-to-run stability, reducing edge bubble defects and non-bonded wafer edges, thereby enabling the formation of high-quality semiconductor substrates for advanced nano-FETs.
Implementation Method 1
bonding a first semiconductor wafer to a second semiconductor wafer in a controlled humidity environment, forming a semiconductor substrate suitable for nano-FETs
Data Source
AI summary
A method of forming a semiconductor device includes loading a first wafer and a second wafer into a wafer bonding system. A relative humidity within the wafer bonding system is measured a first time. After measuring the relative humidity, the relative humidity within the wafer bonding system may be adjusted to be within a desired range. When the relative humidity is within the desired range, the first wafer is bonded to the second wafer.