Semiconductor Reactor Part Holes with Segmented Coating Design
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Solution Overview
Problem
Semiconductor reactor parts, particularly those made of graphite, are prone to damage from reactive chemical species in processing chambers, leading to costly replacements and inadequate protection due to poor step coverage of protective coatings in holes with high aspect ratios.
Innovation Solution
A method involving the use of partially-formed gas dividers with strategically designed holes and a one-step chemical vapor deposition process to achieve good step coverage and mechanical integrity, where the aspect ratios of hole portions and passages are optimized to facilitate uniform coating deposition, using silicon carbide as the protective material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If holes with high aspect ratios are used in reactor parts, then gas distribution functionality is achieved, but protective coating coverage becomes inadequate
Solution Approach 1:
The hole structure is segmented into multiple portions with different aspect ratios. The first portion (entry region) has a lower aspect ratio to facilitate coating deposition, while the second portion (exit region) has a higher aspect ratio to achieve the desired gas distribution pattern. This segmentation allows each region to be optimized for its specific function.
Solution Approach 2:
Different regions of the hole are given different geometric properties. The entry region features a larger diameter and lower aspect ratio for coating accessibility, while the exit region has a smaller diameter and higher aspect ratio for functional performance. This local differentiation resolves the contradiction between coating coverage and gas distribution functionality.
2Reliability
If conventional coating processes are used on high aspect ratio holes, then process complexity increases, but protective coverage remains insufficient
Solution Approach 1:
The hole geometry is pre-designed with optimized aspect ratios in different regions before the coating process begins. The entry region is intentionally made accessible (lower aspect ratio) to allow coating material to reach all surfaces easily, eliminating the need for complex multi-step coating procedures while ensuring complete protective coverage.
3Productivity
If graphite reactor parts are exposed to reactive chemical species, then processing functionality is maintained, but part damage occurs
Solution Approach 1:
The reactor part uses a composite structure combining graphite (for thermal and electrical properties needed for processing) with a protective coating layer (for chemical resistance). The coating acts as a barrier between the graphite and reactive chemical species, allowing the graphite to maintain its processing functionality while being protected from chemical damage.
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
The solution provides adequate protection to reactor parts by ensuring complete coverage of protective coatings within holes, preventing damage from process gases and reducing the complexity and cost of the coating process, while maintaining mechanical integrity and uniform gas distribution.
Implementation Method 1
coating surfaces of the gas divider, including the surface of the holes, by chemical vapor deposition
Data Source
AI summary
Holes in semiconductor processing reactor parts are sized to facilitate deposition of protective coatings, such as by chemical vapor deposition at atmospheric pressure. In some embodiments, the holes each have a flow constriction that narrows the holes in one part and that also divides the holes into one or more other portions. In some embodiments, the aspect ratios of the one or more other portions are about 15:1 or less, or about 7:1 or less, and have a cylindrical or conical cross-sectional shape. The holes are coated with a protective coating, such as a silicon carbide coating, by chemical vapor deposition, including chemical vapor deposition at atmospheric pressure.