Flexible Electrode Protection in Substrate Processing
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Solution Overview
Problem
Conventional substrate processing apparatuses with flexible electrodes experience vertical deformation due to heat and long-term use, leading to non-uniform plasma distribution and film thickness variations across semiconductor wafers.
Innovation Solution
The substrate processing apparatus incorporates flexible electrodes protected by bent tubes with tip ends extending beyond the bent portions, reducing vertical deformation and maintaining consistent plasma generation across vertically stacked substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If flexible electrodes are used to accommodate thermal expansion and movement, then ease of operation is improved, but electrode length stability deteriorates due to deformation from heat and long-term use
Solution Approach 1:
The protecting tube is designed with a bent portion (curved structure) instead of a straight configuration. This curvature allows the protecting tube to flex and accommodate the natural deformation of the flexible electrode during thermal cycling and long-term use, while the electrode tip extends beyond the bent portion to maintain its functional position and length stability.
2Ease of operation
If the electrode length is allowed to vary due to flexibility, then ease of operation is improved, but film thickness uniformity deteriorates because plasma distribution becomes non-uniform
Solution Approach 1:
The protecting tube acts as an intermediary element between the flexible electrode and the processing environment. It provides mechanical protection and structural guidance, allowing the electrode to flex without compromising the uniform positioning required for consistent plasma distribution and film thickness across the substrate.
3Manufacturing precision
If the electrode tip is positioned higher to ensure plasma generation, then film formation is improved, but electrode deformation from friction with protecting tube worsens
Solution Approach 1:
The bent portion of the protecting tube creates a curved pathway that reduces friction between the electrode and the tube wall. This curvature allows the electrode to extend to the necessary height for proper plasma generation while minimizing contact friction that would otherwise cause deformation and length instability.
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 design ensures consistent film formation and improved uniformity across semiconductor wafers by preventing electrode shortening and maintaining plasma density, thereby enhancing film quality and reducing vertical deformation of electrodes.
Implementation Method 1
substrate processing apparatus which forms a film on a semiconductor wafer utilizing plasma-excited processing gas
Data Source
AI summary
Disclosed is a substrate processing apparatus, including: a processing chamber to accommodate a plurality of substrates therein in such a way that the substrate are vertically stacked; a gas supply system to supply processing gas into the processing chamber; an exhaust system to exhaust an atmosphere from the processing chamber; at least a pair of electrodes made of flexible member extending in a stacking direction of the substrates to activate the processing gas; and protecting tubes to accommodate the electrodes therein, wherein each of the protecting tubes is provided with a bent portion at a higher position than an uppermost substrate, and a tip end of each of the electrodes is located on a tip end side of each of the protecting tubes over the bent portion.