Wafer Bonding Humidity Range for Edge Bubble Prevention
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Solution Overview
Problem
As the semiconductor industry continues to reduce minimum feature sizes to increase integration density, challenges arise in maintaining reliable bonding processes for semiconductor substrates, particularly in controlling humidity to prevent edge bubble defects and non-bonded wafer edges.
Innovation Solution
A wafer bonding system is implemented that allows for the controlled bonding of semiconductor wafers in an environment with regulated humidity, using a surface treatment process to activate the wafer surfaces and a bonding process that maintains relative humidity within a specific range to enhance bonding quality and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional bonding processes are used without humidity control, then the bonding process is simpler and faster, but edge bubble defects and non-bonded wafer edges occur
Solution Approach 1:
The patent applies parameter changes by controlling the relative humidity environment during wafer bonding. Specifically, the bonding process is performed in a controlled humidity environment where the relative humidity is maintained between 20% and 70%, which optimizes the bonding quality and prevents edge bubble defects without requiring complex additional equipment
Solution Approach 2:
The patent uses water molecules as an intermediary substance in the bonding process. By controlling the humidity environment, water molecules facilitate the bonding between wafer surfaces, particularly at the edges, preventing non-bonded defects while maintaining a relatively simple process
2Productivity
If minimum feature sizes are reduced to increase integration density, then more components can be integrated into a given area, but bonding reliability deteriorates
Solution Approach 1:
The patent addresses the bonding reliability issue in high-density integration by changing the environmental parameter of relative humidity during bonding. By maintaining humidity between 20% and 70%, the process ensures reliable bonding even when minimum feature sizes are reduced, allowing continued increase in integration density without sacrificing bonding 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
The controlled humidity environment improves the bonding quality by reducing edge bubble defects and non-bonded wafer edges, thereby enhancing the reliability and consistency of semiconductor substrate formation for devices like nano-FETs.
Implementation Method 1
A wafer bonding system is implemented that allows for the controlled bonding of semiconductor wafers in an environment with regulated humidity
Implementation Method 2
using a surface treatment process to activate the wafer surfaces
Implementation Method 3
a bonding process that maintains relative humidity within a specific range to enhance bonding quality and stability
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.