Ferromagnetic Wafer Bonding for Precise Die Alignment
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Solution Overview
Problem
Existing wafer bonding techniques using air pressure and mechanical actuators result in imprecise control, leading to low-quality bonds, misalignment, and distortion, which affects the performance and lifespan of semiconductor devices.
Innovation Solution
Implementing ferromagnetic control by incorporating a layer of ferromagnetic material in the wafers and using electromagnets in the bonding device to generate precise magnetic fields for aligning and bonding the wafers, allowing for precise control of the bonding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If air pressure and mechanical actuators are used for wafer bonding control, then the bonding process can be initiated, but the alignment accuracy deteriorates to about 75 nm resulting in low-quality bonds and distortion
Solution Approach 1:
The patent replaces the mechanical actuator system with a magnetic field-based control system. Electromagnets generate controlled magnetic fields that interact with ferromagnetic material layers in the wafers, enabling precise positioning and bonding control without mechanical contact. This substitution eliminates the alignment inaccuracies and distortion associated with mechanical actuators while achieving superior alignment accuracy.
Solution Approach 2:
The patent introduces ferromagnetic material layers into the wafer structure, fundamentally changing the physical properties of the wafers. This parameter change enables the wafers to respond to magnetic field control, allowing for precise alignment and bonding control that was not achievable with traditional mechanical methods. The magnetic interaction provides fine-tunable control over the bonding process.
2Measurement precision
If air pressure and mechanical actuators are used for wafer bonding, then bonding can be achieved, but the control precision deteriorates leading to misalignment and distortion
Solution Approach 1:
The patent replaces mechanical actuation with electromagnetic control. The electromagnets provide precise, contactless control of the wafer positioning and bonding process through magnetic field interaction with ferromagnetic layers. This enables superior measurement and control precision compared to mechanical systems, eliminating misalignment and distortion issues.
3Ease of manufacture
If traditional mechanical bonding methods are used, then the device structure can be formed, but the lifespan deteriorates due to low-quality bonds
Solution Approach 1:
The patent modifies the wafer structure by incorporating ferromagnetic material layers, which fundamentally changes how bonding is achieved. This parameter change enables precise magnetic control during bonding, resulting in high-quality bonds that maintain device integrity and extend lifespan while preserving ease of manufacture through a controlled process.
Solution Approach 2:
By replacing mechanical bonding control with electromagnetic control, the patent achieves superior bond quality that enhances device lifespan. The magnetic field-based approach provides more uniform and precise bonding control, eliminating the distortion and misalignment that compromise device longevity in traditional mechanical methods.
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 achieves improved alignment accuracy of about 10 nm, resulting in higher-quality bonds and extended lifespan of semiconductor devices compared to traditional methods with 75 nm accuracy.
Implementation Method 1
controlling one or more magnetic fields, that interact with the layer of ferromagnetic material, to cause bonding of the first semiconductor device and the second semiconductor device
Implementation Method 2
the magnetic fields may be controlled to repel and/or attract the layer of ferromagnetic material, to thereby flex or bow the wafer to initiate and control bonding of the wafers
Data Source
AI summary
Implementations described herein relate to various semiconductor device assemblies. In some implementations, a semiconductor device assembly may include a first semiconductor die, a second semiconductor die in a stacked arrangement with the first semiconductor die, and a layer of ferromagnetic material disposed between the first semiconductor die and the second semiconductor die.