Reverse Wafer Etching Chamber Layout to Prevent Contamination
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Solution Overview
Problem
As integrated circuits shrink, achieving uniformity and high-quality etching becomes crucial for faster wiring and higher circuit integration, but existing technologies struggle to prevent impurities and by-products from contaminating the wafer surface during the etching process.
Innovation Solution
A processing apparatus and method where the wafer is arranged in a reverse direction within the chamber, with the wafer surface facing the bottom surface of the chamber, and etching plasma is generated between the wafer carrier and the bottom surface of the chamber, preventing impurities and by-products from falling on the wafer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wafer is arranged in the conventional direction with the wafer surface facing upward in the chamber, then the etching process can be performed using standard equipment configuration, but impurities and by-products will fall on the wafer surface due to gravity causing contamination and defects
Solution Approach 1:
The patent applies inversion by arranging the wafer in reverse orientation with the wafer surface facing downward toward the bottom surface of the chamber instead of the conventional upward orientation. This inversion prevents impurities and by-products from falling on the wafer surface due to gravity, thereby eliminating contamination and improving processing quality without requiring fundamental changes to the etching process itself
2Manufacturing precision
If the wafer is arranged in reverse direction with surface facing bottom surface, then impurity contamination is prevented, but the equipment configuration and process setup become more complex
Solution Approach 1:
The patent simplifies the overall system by using the inversion principle to eliminate the need for complex impurity removal mechanisms. By simply reversing the wafer orientation, the system naturally prevents contamination through gravity, avoiding the need for additional filters, shields, or complex gas flow control systems that would otherwise be required
3Ease of manufacture
If conventional etching process is used with wafer surface facing upward, then the process setup is simple, but by-products settle on the wafer surface causing structural defects
Solution Approach 1:
The patent maintains ease of manufacture by using a straightforward wafer orientation change rather than complex process modifications. The inversion principle allows the etching chemistry and plasma generation to remain conventional while simply changing the wafer's physical orientation to prevent by-product settlement, thereby achieving both simple setup and high manufacturing precision
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 enhances the performance of the etching process, reduces pattern and structural defects, and improves overall processing quality by preventing contamination from impurities and by-products.
Implementation Method 1
etching plasma being generated between the wafer carrier and the bottom surface of the chamber
Implementation Method 2
at least one electrode is disposed on the chamber
Implementation Method 3
the wafer is etched through the etching gas
Implementation Method 4
an etching process is carried out by depositing a material layer on a surface of a substrate, followed by etching the material layer through a plasma
Data Source
AI summary
The present disclosure relates to a processing apparatus and a processing method, and the processing apparatus includes a chamber, a wafer carrier, at least one air inlet and at least one electrode, wherein the wafer carrier is extended into the chamber, the gas inlet is arranged around the chamber, and the electrode is disposed on the chamber.