CVD Susceptor Testing via Transparent Conductive Layer
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Solution Overview
Problem
Existing methods for testing a susceptor in chemical vapor deposition (CVD) apparatuses require reducing the chamber temperature, which is time-consuming and can lead to susceptor contamination, taking over 48 hours and potentially damaging the equipment.
Innovation Solution
A method involving a substrate with a transparent conductive layer is used to determine susceptor normalcy by measuring surface resistance across the layer, allowing for quick assessment without temperature reduction, using indium tin oxide, zinc oxide, or aluminum zinc oxide layers, and determining normalcy based on uniformity within a 15% deviation range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the chamber temperature is reduced and quartz glass is inserted to test the susceptor, then the temperature measurement accuracy is improved, but the testing time increases significantly and the susceptor may become polluted
Solution Approach 1:
A transparent conductive layer is introduced as an intermediary substance between the susceptor and the measurement system. This layer allows electrical resistance measurement to indirectly indicate susceptor temperature and uniformity without requiring direct temperature sensing or chamber opening, thus saving time and preventing contamination
Solution Approach 2:
The mechanical process of opening the chamber and inserting physical temperature sensors is replaced by an electrical resistance measurement method. The transparent conductive layer's resistance changes with temperature, providing a non-contact, non-intrusive way to assess susceptor conditions
2Measurement precision
If the chamber is opened to insert quartz glass for testing, then the temperature can be measured, but the susceptor becomes polluted and the equipment complexity increases
Solution Approach 1:
The transparent conductive layer serves as a mediator that enables temperature assessment without direct contact between external measurement tools and the susceptor. The layer is deposited on the susceptor surface and its electrical properties reflect the thermal state, eliminating the need to open the chamber
Solution Approach 2:
Instead of directly measuring the susceptor's temperature through physical contact, the patent creates a thermal copy or proxy by depositing a transparent conductive layer whose resistance characteristics mirror the susceptor's temperature distribution, allowing indirect measurement
3Reliability
If the susceptor temperature is periodically checked by reducing chamber temperature, then the susceptor normalcy can be determined, but the productivity decreases due to extended testing time
Solution Approach 1:
The transparent conductive layer remains on the susceptor during normal operation, allowing continuous or periodic resistance measurements to be taken without interrupting the deposition process or requiring chamber opening, thus maintaining continuous productive operation while monitoring susceptor health
Solution Approach 2:
The transparent conductive layer itself serves dual purposes: it functions as part of the deposition structure and simultaneously acts as a temperature sensor through its resistance properties. This self-service capability eliminates the need for separate testing procedures that would reduce productivity
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 approach enables rapid and efficient determination of susceptor normalcy, reducing testing time significantly and preventing contamination, ensuring uniform deposition film formation and maintaining susceptor integrity.
Implementation Method 1
determining whether or not the susceptor of the CVD apparatus is normal by measuring a surface resistance across the transparent conductive layer
Data Source
AI summary
A method for testing a susceptor of a chemical vapor deposition (CVD) apparatus includes preparing a substrate including a transparent conductive layer, disposing the substrate with the transparent conductive layer on the susceptor of the CVD apparatus, and determining whether or not the susceptor of the CVD apparatus is normal by measuring a surface resistance across the transparent conductive layer.