Rotatable Etching Cell With Sealed HF Wafer Chambers
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Solution Overview
Problem
Existing electrochemical etching processes for semiconductor wafers using hydrofluoric acid are hazardous for workers due to direct exposure risks and inefficient in handling and reuse of the etching solution, leading to increased waste and contamination risks.
Innovation Solution
A reaction chamber with a mesh cathode, anodes, and a sealable design allows for safe handling and reuse of hydrofluoric acid by enabling simultaneous etching of multiple wafers without direct worker contact, using a reversible seal and orientation to minimize exposure and waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional electrochemical etching processes are used with hydrofluoric acid, then semiconductor wafers can be etched, but worker exposure to harmful etching solutions increases
Solution Approach 1:
The reaction chamber is divided into multiple compartments, each capable of holding and etching separate semiconductor wafers. This segmentation allows the etching process to be distributed across multiple isolated chambers, reducing the risk of widespread exposure and enabling safer handling of multiple wafers simultaneously without increasing individual exposure risk
Solution Approach 2:
The patent introduces an intermediary sealed reaction chamber system that acts as a barrier between the hydrofluoric acid and workers. The chamber with removable lids and sealed compartments serves as an intermediary containment structure, allowing etching operations to proceed while physically isolating the harmful chemical from direct worker contact
2Manufacturing precision
If hydrofluoric acid solutions are used for electrochemical etching, then porous silicon structures can be produced, but chemical spills and contamination risks increase
Solution Approach 1:
The patent converts the harmful nature of hydrofluoric acid into a benefit by utilizing its etching capability to precisely create porous silicon structures while containing it within sealed chambers. The controlled electrochemical etching process transforms the potentially dangerous chemical into a precise manufacturing tool, producing high-quality porous structures while the containment system prevents spills and contamination
Solution Approach 2:
The patent extracts the hydrofluoric acid into sealed reaction chambers, isolating it from the external environment. By taking out the harmful chemical and confining it within controlled compartments with removable lids, the system maintains the necessary etching function while preventing chemical spills and contamination of the surrounding workspace
3Productivity
If multiple semiconductor wafers are etched simultaneously, then productivity increases, but the complexity of managing etching solutions increases
Solution Approach 1:
The reaction chamber is segmented into multiple compartments, each capable of independently holding and etching semiconductor wafers. This segmentation enables simultaneous processing of multiple wafers while maintaining relatively simple management of etching solutions, as each compartment can be independently sealed and accessed through removable lids
Solution Approach 2:
The reaction chamber design provides multi-functionality by enabling simultaneous etching of multiple wafers in different compartments while using the same etching solution. The chamber structure serves multiple purposes: containment, separation of wafers, and controlled access, thereby increasing productivity without proportionally increasing solution management complexity
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 solution reduces worker exposure to hydrofluoric acid, enhances process efficiency by allowing continuous etching with reusable solutions, and minimizes chemical spills and contamination.
Implementation Method 1
porous silicon structures can be produced by electrochemically (EC) etching crystalline silicon in a hydrofluoric (HF) acid solution
Implementation Method 2
The mesh cathode is electrically connected through the reaction chamber body to a DC power source
Data Source
AI summary
The present disclosure provides a reaction chamber, and methods of using the same, wherein the reaction chamber includes a mesh cathode, a first anode, a second anode, and a reaction chamber body, wherein the reaction chamber body is hollow and has a first opening and a second opening, where semiconductor wafers to be electrochemically etched can be sealed. One benefit of the reaction chamber and methods disclosed herein can be allowing for numerous etching operations to be performed with minimal or no contact of the operator with the etching solution, such as hydrofluoric acid.