Thermocouple Alignment Features for Semiconductor Reactors
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Solution Overview
Problem
Existing thermocouples in semiconductor processing chambers lack features for precise alignment during manufacture and installation, leading to inaccurate temperature measurements due to potential mislocation of junctions, which can result in uneven substrate heating and affect the quality of deposited layers.
Innovation Solution
The thermocouple design incorporates internal and external alignment features, such as cut-outs and recessed regions, to ensure consistent and precise positioning of the junction within the susceptor ring, preventing misalignment and optimizing temperature measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional thermocouples without alignment features are used, then the device complexity is reduced, but the measurement precision deteriorates due to potential mislocation of junctions
Solution Approach 1:
The patent applies preliminary action by incorporating alignment features (such as grooves, ridges, or asymmetric patterns) on the thermocouple sheath surface before installation. These pre-designed features guide the thermocouple into proper alignment with the susceptor ring during installation, ensuring the junction is consistently positioned at the desired location without requiring complex alignment procedures during assembly.
Solution Approach 2:
The alignment features on the thermocouple sheath act as an intermediary mechanism between the thermocouple and the susceptor ring. These features facilitate proper positioning by mechanically interfacing with corresponding features on the susceptor ring, mediating the alignment process and ensuring repeatable junction placement without requiring complex external alignment tools or procedures.
2Manufacturing precision
If thermocouples are installed without alignment features, then the ease of operation is improved, but the manufacturing precision deteriorates due to inconsistent junction positioning
Solution Approach 1:
The alignment features are pre-formed on the thermocouple sheath during manufacturing, creating guiding structures that automatically direct the thermocouple into correct alignment during installation. This preliminary preparation eliminates the need for complex alignment procedures during installation while ensuring consistent junction positioning accuracy.
Solution Approach 2:
The patent employs asymmetric alignment features (such as off-center grooves, ridges, or patterns) on the thermocouple sheath that create a unique geometric signature. These asymmetric features can only mate with corresponding asymmetric features on the susceptor ring in one specific orientation, automatically ensuring correct alignment and consistent junction positioning without requiring complex alignment procedures.
3Reliability
If alignment features are added to the thermocouple, then the reliability is improved through consistent junction location, but the device complexity increases
Solution Approach 1:
The alignment features are incorporated into the thermocouple sheath design during manufacturing, creating pre-formed guiding structures that ensure consistent junction positioning during installation. This preliminary preparation enhances measurement reliability by eliminating positioning variability while adding minimal structural complexity to the thermocouple assembly.
Solution Approach 2:
The patent applies local quality by adding alignment features only at specific locations on the thermocouple sheath surface where they are most effective for positioning. Rather than redesigning the entire thermocouple structure, the alignment features are localized to specific regions, enhancing reliability through consistent positioning while minimizing the overall increase in device complexity.
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 alignment features enable accurate and repeatable temperature measurements, enhancing the uniformity of substrate heating and improving the quality of semiconductor processing by ensuring the thermocouple junction is consistently located at the desired position, thereby improving process reliability.
Implementation Method 1
Thermocouples typically include at least one junction formed by fusing the ends of multiple wires together, wherein the wires are formed of at least two dissimilar metals to that a thermocouple is formed therebetween
Data Source
AI summary
A thermocouple having at least one inner alignment feature or at least one outer alignment feature, or a combination thereof for positively positioning and aligning at least one thermocouple junction within a bore formed in a susceptor ring of a semiconductor substrate processing reactor. The outer alignment feature is configured to positively align the junction(s) longitudinally within the bore. The inner alignment feature configured to positively position the junction(s) rotationally within the sheath of the thermocouple relative to the bore.