Useful Layer Thickness Uniformity via Fracture Wave Control
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Solution Overview
Problem
Existing methods for transferring a useful layer onto a support substrate result in periodical patterns of variation in thickness due to interactions between the fracture wave and acoustic vibrations, requiring complex setups like absorbing elements to mitigate these patterns.
Innovation Solution
Initiating the fracture wave in a central area of the embrittlement plane and controlling its propagation speed to confine interactions with acoustic vibrations to a peripheral area, thereby limiting pattern formation to one part of the useful layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an absorbing element is added to detect and dissipate acoustic waves, then the formation of periodical patterns in the useful layer is prevented, but the complexity of the transfer method increases
Solution Approach 1:
The patent extracts and eliminates the absorbing element from the system by changing the fracture wave initiation location to the central area, thereby removing the need for additional components while maintaining uniform layer thickness
Solution Approach 2:
The patent applies preliminary action by strategically positioning the fracture wave initiation in the central area of the embrittlement plane before the fracture occurs, which preemptively prevents acoustic wave interactions that would cause thickness variations
2Manufacturing precision
If the fracture wave propagation speed is increased, then the interaction time with acoustic vibrations is reduced, but the control precision required increases
Solution Approach 1:
The patent changes the parameter of fracture wave propagation speed to a high value, which reduces the interaction time with acoustic vibrations and confines pattern formation to the peripheral area, thereby achieving uniform thickness in the central useful layer
Solution Approach 2:
The patent segments the useful layer into a central area (free of patterns) and a peripheral area (where patterns are confined), achieving functional separation that ensures uniformity where needed
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 effectively reduces periodical patterns of variation in thickness to a peripheral area, achieving uniformity in the useful layer's thickness by controlling the fracture wave's speed and initiation point, ensuring a simpler and more efficient transfer method.
Implementation Method 1
acoustic vibrations are emitted upon the initiation and/or the propagation of the fracture wave. The interaction between the fracture wave and such acoustic vibrations results in the forming of periodical patterns of variation in the thickness of the formed useful layer
Implementation Method 2
forming an embrittlement plane by implanting light species into a first substrate
Implementation Method 3
applying a heat treatment for embrittling the assembly to be fractured
Data Source
AI summary
Substrates may include a useful layer affixed to a support substrate. A surface of the useful layer located on a side of the useful layer opposite the support substrate may include a first region and a second region. The first region may have a first surface roughness, may be located proximate to a geometric center of the surface, and may occupy a majority of an area of the surface. The second region may have a second, higher surface roughness, may be located proximate to a periphery of the surface, and may occupy a minority of the area of the surface.