Floating Quartz Comb Wafer Boat for Thermal Expansion Control
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Solution Overview
Problem
Conventional wafer boats made of materials like quartz, silicon carbide, silicon, or alumina are expensive, fragile, and require long lead times for repair, failing to meet the needs of strength, cost-effectiveness, and functionality in thermal processes.
Innovation Solution
A wafer boat design featuring combs with floating ends, supported by lower comb holders and connected to a slide assembly with ball and socket joints, allowing for thermal expansion and efficient movement within a furnace.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional wafer boats are made of quartz, silicon carbide, silicon, or alumina, then they can withstand thermal processes, but they are expensive and fragile
Solution Approach 1:
The wafer boat is divided into multiple combs that are separately supported by lower comb holders and upper comb holders. Each comb can expand and contract independently during thermal processes, reducing stress concentration and preventing catastrophic failure. This segmentation allows the use of materials that can withstand high temperatures while reducing overall fragility through distributed structural support.
Solution Approach 2:
The wafer boat employs a composite structure combining different materials: combs made of one material and comb holders made of another material. This allows optimization of each component for its specific function - the combs for thermal resistance and the holders for mechanical support and floating capability. The composite approach enables the system to withstand thermal processes while reducing fragility through material selection and structural design.
2Temperature
If conventional wafer boats are made of expensive materials, then they can withstand thermal processes, but they require long lead times for repair
Solution Approach 1:
The wafer boat is segmented into multiple combs and holders that can be independently replaced. If one comb is damaged during thermal processing, only that specific comb needs to be replaced rather than the entire wafer boat. This reduces repair time significantly and allows for quick replacement of worn or damaged components without replacing the entire structure.
Solution Approach 2:
The design allows individual combs to be discarded and replaced independently when damaged or worn. The comb holders and supporting structure are recovered and reused, reducing the overall repair time and material waste. This selective replacement strategy minimizes loss of time by focusing repair efforts only on the damaged components rather than the entire wafer boat.
3Stability of the object's composition
If combs are rigidly fixed in comb holders, then structural stability is improved, but thermal expansion causes errors
Solution Approach 1:
The combs are designed to float within the comb holders rather than being rigidly fixed, allowing dynamic adjustment during thermal processes. The combs can move vertically and laterally within the holders to accommodate thermal expansion and contraction, maintaining structural stability while preventing vertical errors. This dynamic design enables the structure to adapt to temperature changes without compromising precision.
Solution Approach 2:
The floating comb design explicitly accounts for thermal expansion by allowing combs to expand and contract within the comb holders without rigid constraints. The combs can freely expand in all directions while maintaining their functional position, preventing the accumulation of thermal stresses that would otherwise cause vertical errors or structural failure. This design embraces thermal expansion rather than resisting it.
4Temperature
If wafer boats are made fragile for thermal resistance, then they can withstand high temperatures, but they are difficult to handle
Solution Approach 1:
The wafer boat is segmented into multiple combs and holders that can be independently handled and replaced. This segmentation makes the overall structure lighter and easier to manipulate during loading and unloading operations. Individual components can be adjusted or replaced without moving the entire wafer boat, improving ease of operation while maintaining thermal process resistance through the use of appropriate materials.
Solution Approach 2:
The composite structure uses materials optimized for different functions: thermal resistance for the combs and ease of handling for the holders. This allows the wafer boat to withstand high temperatures while being easier to handle during operational procedures. The combination of materials and structures balances thermal performance with operational convenience.
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 design provides a robust, cost-effective solution that accommodates thermal expansion, reduces vertical errors, and facilitates efficient handling and heating of semiconductor structures.
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.
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.