Floating Quartz Comb Wafer Boat for Thermal Expansion
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Solution Overview
Problem
Conventional wafer boats used in semiconductor manufacturing are expensive, fragile, and require long lead times for repair, and existing designs do not adequately account for thermal expansion during heating processes.
Innovation Solution
A wafer boat system comprising a comb structure with floating ends, supported by lower comb holders and connected to a slide assembly via ball and socket joints, allowing for thermal expansion and efficient movement within a furnace.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional wafer boats are made entirely of quartz, silicon carbide, silicon, graphite, alumina, or some combination, then they can support semiconductor structures during heating, but they are relatively expensive and fragile
Solution Approach 1:
The wafer boat combines metal components (lower comb holder, upper comb holder, comb) with quartz components (comb teeth, support surfaces). This composite structure provides both the mechanical strength of metal and the thermal resistance of quartz, resolving the contradiction between strength and fragility while enabling the boat to withstand thermal processing conditions.
Solution Approach 2:
The wafer boat is divided into multiple segments: lower comb holder, comb with floating mechanism, upper comb holder, and comb teeth. This segmentation allows each component to be optimized for its specific function - metal holders provide structural strength while quartz teeth provide thermal resistance and support surfaces, reducing overall fragility.
2Temperature
If conventional wafer boats are made of traditional materials, then they can withstand thermal processes, but they require long lead times for fabrication and repair
Solution Approach 1:
The wafer boat is segmented into modular components (holders, comb, teeth) that can be manufactured separately and assembled. This modular design enables parallel fabrication of components and simplifies repair - damaged quartz teeth can be replaced without replacing the entire boat, significantly reducing fabrication and repair lead times while maintaining thermal resistance.
Solution Approach 2:
The floating mechanism allows the comb to self-adjust during thermal expansion, reducing the need for precise pre-fabrication tolerances and external vendor repair services. The design enables in-house maintenance and component replacement.
3Stability of the object's composition
If wafer boats are designed with fixed comb structures, then they provide stable support, but they cannot accommodate thermal expansion during heating
Solution Approach 1:
The comb is designed with a floating mechanism that allows it to move dynamically within the upper comb holder. During heating, the comb can expand and shift position freely within the holder's tolerance range, accommodating thermal expansion while maintaining stable support of semiconductor structures through the constrained floating mechanism.
Solution Approach 2:
The floating mechanism changes the physical state of the comb from fixed to movable, allowing positional adjustment during thermal cycles. This parameter change enables the structure to adapt to thermal expansion while maintaining operational stability through the constrained motion mechanism.
4Strength
If wafer boats use complex attachment mechanisms, then they provide secure support, but they increase device complexity and cost
Solution Approach 1:
The attachment system is segmented into simple, discrete components: the lower holder provides fixed support, the comb provides floating attachment with minimal constraints, and the upper holder provides guided movement. This segmented approach achieves secure support while minimizing structural complexity compared to integrated attachment mechanisms.
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 system provides a robust, cost-effective solution that minimizes thermal stress and facilitates efficient handling and heating of semiconductor structures, reducing the need for external repairs and shortening fabrication times.
Implementation Method 1
The comb and upper comb holder are configured to enable the comb to float within the upper comb holder... Each comb slides within the upper comb holder as the wafer boat heats
Implementation Method 2
supported by lower comb holders and connected to a slide assembly via ball and socket joints, allowing for thermal expansion and efficient movement within a furnace
Data Source
AI summary
Systems for transporting a plurality of semiconductor structures, wafer boats for holding the plurality of semiconductor structures and methods for heating a set of semiconductor wafers. In some embodiments, the wafer boat frame is made of a metal and the combs are made of quartz. The wafer boats may include one or more combs that are able to float within a comb holder during heating of the wafer boat.