Silicon Substrate Porosification Edge Uniformity
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Solution Overview
Problem
Existing porosification techniques for silicon substrates often result in non-uniform porous layers along the edges, leading to inefficiencies and additional costly steps in wafer formation, such as removing excess edges to achieve desired shape and size.
Innovation Solution
A method involving placing a silicon substrate between electrodes, with one electrode positioned within a threshold distance of the substrate's edges, allowing for a current to be conducted through the substrate, which enables substantially uniform porosification along the edges, using solutions like hydrofluoric acid and isopropyl alcohol.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional porosification techniques are used, then the silicon substrate can be processed, but the porous layer is non-uniform along the edges
Solution Approach 1:
The patent applies local quality by positioning electrodes at specific locations relative to the substrate edges (within a threshold distance) to create localized electric fields that enhance porosification uniformity at the edges. This targeted approach ensures uniform porous layer formation specifically where needed without requiring additional processing steps for edge removal.
2Manufacturing precision
If electrodes are positioned far from substrate edges, then the setup is simpler, but porosification is non-uniform along the edges
Solution Approach 1:
The patent changes the positional parameter of the electrodes, specifying they be placed within a threshold distance from the substrate edges. This parameter adjustment transforms the electric field distribution to achieve uniform porosification, balancing the need for precision with practical implementation feasibility.
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 ensures uniform porosification along the edges and surfaces of silicon substrates, reducing inefficiencies and costs associated with non-uniform porosification and edge removal processes.
Implementation Method 1
conducting a first current through the first silicon substrate, where placement of the first electrode within the threshold distance of the first edge allows for substantially uniform porosification along the first edge of the first silicon substrate
Data Source
AI summary
Forming a porous layer on a silicon substrate. Forming the porous layer can include placing a first silicon substrate in a solution, where a first electrode is within a threshold distance to an edge of the silicon substrate. It can further include conducting a first current through the silicon substrate, where the first electrode can be positioned relative to the edge allowing for substantially uniform porosification along the edge of the first silicon substrate.