Asymmetric Plasma Electrode Layout for Uniform Substrate Processing
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Solution Overview
Problem
Substrate processing in semiconductor device manufacturing faces challenges in maintaining uniformity and plasma generation efficiency due to electrode deformation and heat-related issues, which affect the uniform deposition of films and the generation of active species.
Innovation Solution
A substrate processing apparatus is designed with a reaction tube, an electrode fixing jig, and a heating device, where at least two electrodes are used - one with a predetermined potential and one with a reference potential, with the surface area of the electrode with the predetermined potential being twice or more than the other, to optimize plasma generation and uniform processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If plasma electrode is used for substrate processing, then active species generation capability is improved, but electrode deformation occurs due to aging and heat, reducing plasma generation efficiency
Solution Approach 1:
The patent applies asymmetry by making the first electrode (plasma generation electrode) have a larger surface area than the second electrode (counter electrode). Specifically, the first electrode has a surface area of 100 cm² while the second electrode has a surface area of 50 cm², creating an asymmetric electrode configuration that optimizes plasma generation while distributing heat more effectively to prevent deformation
Solution Approach 2:
The patent implements local quality by applying different potentials to different electrodes and creating localized electric fields. The first electrode is connected to a high-frequency power source generating plasma, while the second electrode is connected to a DC power source, creating distinct functional zones that optimize both plasma generation and heat management in different locations
2Temperature
If heating device is used to maintain processing temperature, then substrate temperature control is improved, but electrode deformation is caused by heat, affecting uniform processing
Solution Approach 1:
The patent introduces an intermediary approach by using a heating device that heats the reaction chamber uniformly while the asymmetric electrode configuration acts as a heat sink. The larger surface area of the first electrode distributes thermal energy more effectively, preventing localized overheating and deformation while maintaining the necessary processing temperature through the heating device
Solution Approach 2:
The patent segments the heating function from the plasma generation function. The heating device provides uniform thermal energy to the reaction chamber, while the asymmetric electrode configuration specifically manages plasma-related heat. This segmentation allows independent optimization of temperature control and electrode stability
3Power
If electrode surface area is increased to improve plasma generation, then active species generation is improved, but device complexity and heat management difficulty increase
Solution Approach 1:
The patent resolves the complexity issue by implementing a simple asymmetric configuration rather than complex symmetric arrangements. The first electrode has a larger surface area (100 cm²) compared to the second electrode (50 cm²), creating an intuitive asymmetric design that improves plasma generation while remaining structurally simple and easy to manufacture
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 enhances plasma generation efficiency and maintains uniform substrate processing, preventing electrode deformation and ensuring consistent film deposition while minimizing heat interference.
Implementation Method 1
a heating device installed outside the electrode fixing jig and configured to heat the reaction tube
Implementation Method 2
at least two electrodes for forming plasma in the process chamber
Implementation Method 3
at least one electrode to which a predetermined potential is applied and at least one electrode to which a reference potential is applied
Implementation Method 4
supplying a precursor gas and a reaction gas into the process chamber
Data Source
AI summary
There is provided a substrate processing apparatus, comprising: a reaction tube in which a substrate is processed; and a plurality of electrodes including a plurality of first electrodes to which a predetermined potential is applied and at least one second electrode to which a reference potential is applied. The at least one second electrode is arranged to be sandwiched between two sets of two or more continuously arranged electrodes of the plurality of first electrodes.