Antireflective Substrate Holder for Catalytic CVD
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Solution Overview
Problem
In catalytic CVD techniques, substrates are prone to overheating due to radiant ray absorption, leading to degraded film quality, which is a common issue in forming films for semiconductor devices and solar cells.
Innovation Solution
A catalytic CVD equipment with a substrate holder featuring an antireflective film and concave-convex structure on the holding face to reduce radiant ray reflection and absorption, allowing for controlled substrate temperature within a preferred range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a substrate is used in catalytic CVD technique, then a deposited film can be formed on the substrate, but the substrate surface is adversely affected due to overheating from radiant ray absorption
Solution Approach 1:
An antireflective film is introduced as an intermediary layer between the substrate and the radiant ray from the catalytic wire. This film absorbs or blocks the radiant ray, preventing it from being reflected back to the substrate and causing overheating. The antireflective film thus mediates the harmful interaction between the radiant ray and the substrate, allowing film deposition to proceed without substrate damage.
Solution Approach 2:
The antireflective film, which would normally be considered an additional layer or complexity, actually converts the harmful radiant ray reflection into a beneficial effect by absorbing the radiant energy. The film that might seem like an extra step or complication becomes the solution that protects the substrate and improves film quality by preventing overheating.
2Object-affected harmful factors
If an antireflective film is added to the holder, then substrate overheating is prevented, but device complexity increases
Solution Approach 1:
The holding face of the substrate holder is modified by changing its optical parameters - specifically, an antireflective film is applied to change the reflectivity characteristic. This parameter change (from reflective to antireflective) allows the holder to absorb radiant ray and prevent substrate overheating, while the modification is achieved through a relatively simple film application process rather than complex structural redesign.
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 effectively prevents substrate overheating, enabling the formation of high-quality deposited films and solar cells by maintaining the substrate temperature within an optimal range.
Implementation Method 1
a radiant ray (such as an infrared ray or a visible ray, for example) is ejected from the catalytic wire, and a substrate absorbs the radiant ray by itself, and is thereby heated
Implementation Method 2
a substrate holder featuring an antireflective film and concave-convex structure on the holding face to reduce radiant ray reflection and absorption
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
In a catalytic CVD equipment 100, a holder 300 includes an antireflective structure for preventing reflection of a radiant ray that is ejected from the catalytic wire 11 toward the side of the substrate 200.