Laurell
WS-650
What it is
The Laurell WS-650 is a spin coater used for coating photoresist on samples of various sizes.[2]
The Laurell WS-650 is a thin-film fabrication instrument used in cleanroom photolithography work.[1]
How it works
Where it fits in the process flow
General reference — not yet source-verifiedThe Laurell WS-650 is used before exposure and pattern transfer steps that follow photoresist coating.
Applications
The Laurell WS-650 is intended for photoresist coating.[2]
The Laurell WS-650 is dedicated to spin coating commercially available photoresists.[1]
The Laurell WS-650 can be used with substrates that include round wafers, square substrates, wafer fragments, and microscope slides.[2][1]
- Spincoating photoresists
What do the numbers mean?
Vacuum & pumping1
Wafer handling6
Gas & chemistry1
Optics & imaging1
Control & software2
Configuration & options9
Vintage & configurations
What replaced it?
Related models
- predecessorLaurell 400-series— The WS-650 controller is stated to have replaced the WS-400.source[3]
What does it need to run?
Site utility requirements, footprint, and infrastructure needed to install and operate this tool. Sourced from public records.
Where are the manuals?
Generated from public-source data on file. Enter your email to access — nothing is published; details are routed privately.
Not publicly documented
Field notes
No research found yet — worked with this tool? Share what you know.
Frequently asked questions
What determines the final film thickness in spin coating?General reference — not yet source-verified
Final film thickness is controlled primarily by spin speed, spin time, acceleration, fluid viscosity, solids concentration, and solvent evaporation. Higher spin speeds generally produce thinner films, while thicker films can be obtained with higher-viscosity fluids or lower spin speeds.
Can a spin coater handle substrates that are not round wafers?General reference — not yet source-verified
Spin coaters of this class can usually accommodate a range of substrate shapes and sizes through the use of interchangeable vacuum chucks or adjustable holders. Square glass plates, small coupons, and other flat substrates can be coated when the chuck and spin parameters are matched to the substrate.
Why is exhaust or containment important around a spin coater?General reference — not yet source-verified
Spin coating releases solvent vapors and small droplets of the coating liquid as the substrate rotates. Ventilation, exhaust, or an enclosure is generally required to manage solvent exposure and to keep the working environment safe, depending on the chemistry being used.
Can spin coating produce very thick films?General reference — not yet source-verified
Spin coating is best suited to thin, uniform coatings. Very thick layers are difficult to achieve in a single step because centrifugal forces tend to thin the film rapidly. In practice, thick films are made by repeating the coat-and-bake cycle, using a higher-viscosity solution, or choosing a different coating method.
Not publicly documented
The following facts about the WS-650 are absent from this record as of this revision. First-hand knowledge or a citation closes a gap; every submission is reviewed before publication.
No publicly documented production dates or lifecycle milestones (introduction, end of production, EOL) for the WS-650 are on record.
Answerable by: OEM historical records or a trade-press announcement
No publicly documented variants, configuration options, or revision breakpoints of the WS-650 are on record.
Answerable by: an OEM product catalog or an engineer who ordered or specified the tool
The control-system platform and OS era of the WS-650 are not on record.
Answerable by: an engineer who operated it or OEM installation records
No publicly documented failure modes or field errata for the WS-650 are on record.
Answerable by: a field service engineer, process engineer, or maintenance technician
The process node or technology generation of the WS-650 is not on record.
Answerable by: an OEM datasheet or a fab qualification report
No research found yet — worked with this tool? Share what you know.
Sources & citations
Sources (4)Every fact above is drawn from these public sources
- [1]tmi.utexas.edu — tmi.utexas.edutmi.utexas.edu
- [2]aggiefab.tamu.edu — aggiefab.tamu.eduaggiefab.tamu.edu
- [3]web.archive.orgweb.archive.org
- [4]Cleanroom Instrumentation — tmi.utexas.edutmi.utexas.edu
Last updated Oct 3, 2026.
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