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Stainless Steel Cassettes

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YIELD Engineering Systems Inc.

YES home page

YES STAINLESS STEEL PROCESS CASSETTES 

Yield Engineering Systems (YES) stainless steel cassettes are specifically designed for use with the YES-450PB Series high temperature vacuum cure ovens. They are ideal for polyimide bake, BCB cure, copper anneal, as well as other cure processes. YES cassettes can be used throughout the clean room in semiconductor fabrication processes where plastic or quartz cassettes are inappropriate or do not perform as well.

YES cassettes are designed to SEMI specifications and mate to most plastic cassettes, so they can be used on all automated vertical or horizontal transfer systems. (Note: our low profile cassettes, designed for easier manual loading of cassettes inside YES systems, are not compatible with automated vertical transfer systems). All cassette designs, including low profile, are compatible with manual push or slide transfer.

DESIGNED FOR PERFORMANCE 

YES cassettes are designed to achieve accurate wafer support with minimal mass. This allows superior temperature performance in YES-450PB Series cure systems. Temperatures remain uniform throughout heat up and cool down applications minimizing hot/cold spots due to heat sinking. Cassettes are placed with the wafers vertically in YES-450PB Series ovens to facilitate the laminar flow process. The result is a better, more uniform process.

WHY STAINLESS STEEL VS. QUARTZ? 

Unlike quartz, stainless steel can endure high temperatures and repeated use. The outer surface of a quartz cassette vitrifies (changes over time due to heat). This causes two problems: particle introduction increases and cassettes become more brittle with each process run, until eventually the boat (cassette) breaks. When a quartz cassette breaks inside a process oven, it creates particle issues that are time consuming and costly to fix.

Also, the quartz boat is an insulator. When the wafer becomes statically charged there is nowhere for the charge to go and the charged wafers begin to attract particles.Stainless steel cassettes are a conductor which allows the static charge on the wafer to dissipate when placed on a grounded surface.

BENEFITS 

YES Stainless Steel Cassettes/Handlers
  
YES Stainless Steel Cassettes/Handlers

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No particles

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Automated or manual transfer

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Uniform substrate temperature processing

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Best temperature performance for YES-450PB Series ovens

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Lightweight design

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Available in vertical and horizontal

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Designed to SEMI specifications

INFORMATION 
to YES Info Page
YES CASSETTE SPECIFICATIONS 

bullet All 316L SST welded, electro-polished construction (no screws or fasteners).
bullet Outside dimensions similar to SEMI standard plastic process carriers.
bullet Temperature: Although 316L SST is suitable up to 760 C, recommended continuous operating temperature without causing distortion is 500 C (YES-450PB Series tools operate up to 450C).
bullet Corrosion Resistance: 316L SST offers better resistance than 302 and 304 SST. Resists many industrial chemicals and solvents including - sodium and calcium brines, hypo chlorite solutions, phosphoric acid, sulfite liquors and sulfurous acids.

AVAILABLE SIZES 

bullet 25-Wafer Cassettes are available in 2 inch, 3 inch, 100mm, 125mm, 150mm, 150mm short, 200mm, 200mm short, 300mm and 300mm load port.
bullet 13-Wafer Cassettes are available in 300 mm and 300mm load port.
bullet Cassette Handlers are available in 2 inch, 3 inch, 100mm, 125mm, 150mm, 200mm and 300mm.
bullet Load port adaptor and info pads assembly are also available.

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Last modified: 2018-09-15