Plasma Etching Chamber Inner Wall Lift-Off Layer
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Solution Overview
Problem
In semiconductor device manufacturing, it is challenging to remove reactive products deposited along the inner wall of the etching apparatus due to their high boiling points, which complicates the cleaning process and affects the efficiency of the plasma etching process.
Innovation Solution
A method involving the formation of a lift-off layer along the inner wall of the processing chamber, composed of a removable material like carbon, which facilitates the removal of reactive products by creating a lift-off effect during the cleaning process, allowing for the easy removal of reactive products with high boiling points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If reactive products with high boiling points are deposited along the inner wall of the etching apparatus, then the etching process can proceed, but the cleaning process becomes difficult and time-consuming
Solution Approach 1:
A fluorocarbon-containing film is deposited on the inner wall of the etching apparatus before the etching process begins. This preliminary coating acts as a release layer that prevents reactive products from strongly adhering to the wall, enabling easy removal during cleaning without requiring excessive time or aggressive cleaning methods.
Solution Approach 2:
The fluorocarbon-containing film serves as an intermediary substance between the reactive products and the etching apparatus wall. This intermediate layer facilitates the removal of reactive products by providing a surface that allows easy detachment during the cleaning process, thereby reducing cleaning time while maintaining etching efficiency.
2Productivity
If reactive products with high boiling points are deposited along the inner wall of the etching apparatus, then the etching process can proceed, but the cleaning process becomes complex
Solution Approach 1:
The fluorocarbon-containing film is applied in advance to create a controlled surface chemistry that simplifies the cleaning process. This preliminary action transforms a complex cleaning challenge into a straightforward removal process, reducing the number of cleaning steps and chemicals required.
Solution Approach 2:
The fluorocarbon-containing film acts as a disposable protective coating that is easily removed during cleaning. This sacrificial layer simplifies the cleaning process by providing a uniform, easily removable surface that eliminates the need for complex multi-step cleaning procedures.
3Productivity
If reactive products with high boiling points are deposited along the inner wall of the etching apparatus, then the etching process can proceed, but damage to the etching apparatus may occur
Solution Approach 1:
The fluorocarbon-containing film provides a protective cushioning layer on the etching apparatus wall before reactive products are deposited. This preliminary protection prevents direct contact between the reactive products and the apparatus surface, reducing the risk of damage while maintaining etching productivity.
Solution Approach 2:
The fluorocarbon-containing film serves as a protective intermediary between the reactive products and the etching apparatus wall. This intermediate layer prevents harmful interactions while allowing the etching process to proceed, thereby protecting the apparatus integrity without compromising productivity.
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 removes reactive products with high boiling points, improving the cleaning efficiency and preventing damage to the etching apparatus, thereby enhancing the overall plasma etching process and semiconductor device manufacturing.
Implementation Method 1
processing a semiconductor substrate using a plasma etching apparatus
Implementation Method 2
forming a lift-off layer along an inner wall of the processing chamber with the semiconductor substrate loaded in the processing chamber; etching the uneasily-etched material and causing deposition of a reactive product of the uneasily-etched material along the lift-off layer; and cleaning, by removing the reactive product by removing the lift-off layer
Data Source
AI summary
A method of manufacturing a semiconductor device includes processing a semiconductor substrate using a plasma etching apparatus provided with a processing chamber. The semiconductor substrate has an uneasily-etched material formed thereabove and at least an upper layer film formed above the uneasily-etched material. The method includes etching the upper layer film after loading the semiconductor substrate into the processing chamber; forming a lift-off layer along an inner wall of the processing chamber with the semiconductor substrate loaded in the processing chamber; etching the uneasily-etched material and causing deposition of a reactive product of the uneasily-etched material along the lift-off layer; and cleaning, by removing the reactive product by removing the lift-off layer, the inner wall of the processing chamber after the semiconductor substrate is unloaded from the plasma etching apparatus.