Inductively Coupled Plasma Metal Window Segmentation
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Solution Overview
Problem
Conventional inductively coupled plasma processing apparatuses face challenges in handling larger-sized substrates due to the brittleness of dielectric windows, making it difficult to scale up the processing chamber effectively.
Innovation Solution
The use of a metal window made of a nonmagnetic and conductive material, such as aluminum, between the high frequency antenna and the processing chamber, which is insulated and divided into sections to accommodate larger substrates, allowing for improved plasma processing capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a dielectric window made of quartz glass or ceramic is used, then plasma processing can be performed, but the window cannot be scaled up due to brittleness
Solution Approach 1:
The dielectric window is divided into multiple smaller sections rather than using a single large piece. This segmentation allows each section to maintain structural integrity while collectively covering a larger area, resolving the contradiction between window area and strength.
Solution Approach 2:
The material properties of the window are changed by transitioning from dielectric materials (quartz glass or ceramic) to nonmagnetic conductive materials (such as aluminum). This parameter change enables both larger area and maintained strength, as metallic materials have different mechanical properties that favor larger structures.
2Area of moving object
If the target substrate is scaled up in size, then processing capacity increases, but the dielectric window becomes difficult to manufacture and install
Solution Approach 1:
Dividing the window into multiple smaller sections makes each section easier to manufacture, transport, and install. The segmented structure allows standard manufacturing processes to be applied to smaller, more manageable pieces that can be assembled to cover large substrate areas.
Solution Approach 2:
Changing from dielectric to conductive nonmagnetic materials fundamentally alters the manufacturing parameters. Metallic materials offer better ductility, formability, and joining characteristics, making large-area windows significantly easier to manufacture compared to brittle dielectric materials.
3Area of stationary object
If a metal window made of nonmagnetic and conductive material is used, then larger substrates can be accommodated, but the window must be insulated from the processing chamber body
Solution Approach 1:
An insulating layer is introduced as an intermediary between the conductive metal window and the processing chamber body. This intermediary layer (such as a dielectric coating or insulation layer) allows the metal window to be electrically isolated while maintaining thermal and structural connection, enabling large area windows without excessive 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
This configuration enables the handling of larger substrates by providing a harder and more processable window, allowing for the generation of high-density plasma and improved plasma processing efficiency, including uniform gas distribution and temperature control.
Implementation Method 1
a high frequency antenna for forming an inductive electric field in the processing chamber
Implementation Method 2
a metal window made of a nonmagnetic and conductive material is formed between the high frequency antenna and the processing chamber while being insulated from a main body which forms the processing chamber
Data Source
AI summary
An inductively coupled plasma processing apparatus includes a processing chamber for accommodating a target substrate to be processed and performing plasma processing thereon, a mounting table provided in the processing chamber for mounting thereon the target substrate, a processing gas supply system for supplying a processing gas into the processing chamber and a gas exhaust system for exhausting the inside of the processing chamber. Further, in the inductively coupled plasma processing apparatus, a high frequency antenna is provided to form an inductive electric field in the processing chamber and a first high frequency power supply is provided to supply a high frequency power to the high frequency antenna. A metal window made of a nonmagnetic and conductive material is formed between the high frequency antenna and the processing chamber while being insulated from a main body which forms the processing chamber.