Spin Coater

Laurell Technologies WS-400 Lite Series Spin Coater

Applies uniform thin films (e.g., photoresist) using controlled high-speed rotation. Film thickness is determined by programmable parameters such as spin speed, time, and acceleration. Used for resist coating and thin-film preparation.

Manual

SOP

Liturature

The Laurell Technologies WS-400 Lite Series Spin Coater is a microprocessor-controlled thin film deposition system used for applying uniform coatings such as photoresist through controlled high-speed rotation. The system operates using programmable multi-step recipes, with user-defined parameters including spin speed (RPM), acceleration, and process duration.

Operation of the system is governed by manufacturer-provided documentation, which defines all required procedures for safe use, programming, and maintenance. The tool incorporates a vacuum chuck for substrate holding, interlock systems (vacuum, lid, and purge pressure), and built-in diagnostics that monitor system performance and automatically shut down the system in the event of faults (e.g., vacuum loss or motor errors).

Technical Features:

  • Programmable multi-step recipes (up to ~50 steps)
  • Adjustable spin speed (RPM), time, and acceleration/deceleration
  • Vacuum chuck for secure substrate holding
  • High-performance drive motor for precise speed control
  • LCD interface and keypad for operation and programming
  • Built-in interlocks (vacuum, lid, purge pressure)
  • Error detection and automatic shutdown (e.g., vacuum loss, RPM errors)
  • Emergency Machine Off (EMO) compatibility
  • Supports dynamic dispense and multi-stage coating processes

 

Basic Operation Workflow:

  • Load substrate onto vacuum chuck
  • Engage vacuum to secure the sample
  • Select or program the spin recipe
  • Dispense coating material (e.g., photoresist) onto substrate
  • Start spin cycle:
    • Low-speed spread (dispense step)
    • Intermediate spin (optional)
    • High-speed spin for uniform thinning
  • System monitors parameters (vacuum, RPM, interlocks) during operation
  • Process completes automatically; substrate is removed after spin

As reflected in this example, both operation and troubleshooting of cleanroom instrumentation are primarily defined by vendor manuals and process-specific guidelines rather than independent or ad hoc protocols. User training consists of guided instruction on these established procedures, and troubleshooting is performed based on equipment status, process conditions, and manufacturer-defined limits.

Detailed Safety Considerations – Spin Coater (Laurell WS-400 Lite Series)

The spin coater involves hazards related to high-speed rotation, chemical handling (photoresists/solvents), vacuum systems, and enclosed mechanical motion. Improper operation can result in chemical exposure, sample ejection, equipment damage, and contamination. Only trained and authorized users may operate the system.

High-Speed Rotation and Mechanical Hazards

  • The system operates at high rotational speeds (thousands of RPM).
  • Never open the lid during operation
  • Ensure lid is fully closed and interlocks are engaged before starting
  • Keep hands clear of the chuck and chamber during operation
  • Do not attempt to stop the spinning chuck manually
  • Ensure substrate is properly centered to avoid imbalance

Vacuum Chuck Safety

  • The system uses a vacuum chuck to secure substrates.
  • Verify vacuum is properly engaged before starting spin
  • Do not operate if vacuum is unstable or lost
  • Ensure substrate is clean and flat for proper sealing
  • Release vacuum before removing substrate
  • Do not touch vacuum ports or seals unnecessarily

Chemical Safety (Photoresist and Solvents)

  • Spin coating involves liquid chemicals such as photoresists and solvents.
  • Handle all chemicals according to SDS and cleanroom protocols
  • Avoid skin contact and inhalation of vapors
  • Use only approved chemicals for the system
  • Clean spills immediately using proper procedures
  • Avoid over-dispensing chemicals that may splash during spinning

Aerosol and Vapor Hazards

  • High-speed spinning can generate aerosols and vapors.
  • Always operate with lid closed
  • Use system in designated ventilated area or chemical hood
  • Avoid inhalation of vapors generated during spinning
  • Ensure exhaust or filtration systems are functioning

Electrical Safety

  • The system includes motor drive electronics and control systems.
  • Do not operate with damaged power cords or exposed wiring
  • Ensure proper grounding before operation
  • Do not open system panels or attempt internal repairs
  • Turn off power before maintenance or cleaning

Process and Parameter Safety

  • Incorrect parameters can cause sample loss or system faults.
  • Verify spin speed, acceleration, and time before starting
  • Start with conservative settings for new processes
  • Avoid excessive speeds that may dislodge substrates
  • Ensure recipe parameters are appropriate for material and substrate

Contamination Control (Cleanroom Use)

  • Spin coaters are critical for thin film uniformity and contamination control.
  • Use only clean, approved substrates and materials
  • Clean chamber and chuck regularly
  • Avoid cross-contamination between different photoresists or chemicals
  • Dispose of excess resist and waste properly

Mechanical and Handling Hazards

  • Use proper tools (tweezers, vacuum wand) for loading/unloading substrates
  • Avoid dropping wafers into the chamber
  • Ensure substrate is centered before starting spin
  • Do not overload or stack substrates

PPE Requirements

  • Cleanroom garments (as required for the area)
  • Safety glasses or face shield
  • Chemical-resistant gloves

Operational Safety Checks (Pre-Run)

  • Substrate is clean, centered, and secured
  • Vacuum is functioning properly
  • Lid is closed and interlocks are active
  • Spin recipe parameters are verified
  • Chemical dispensing is controlled
  • Chamber is clean and free of debris

Post-Operation Safety

  • Wait until chuck fully stops before opening lid
  • Release vacuum before removing substrate
  • Remove substrate carefully using proper tools
  • Clean chamber and remove residual chemicals
  • Dispose of waste properly
  • Log usage and report abnormalities

Waste Handling and Chemical Disposal

  • Collect excess photoresist and solvent waste in designated containers
  • Do not dispose of chemicals in drains
  • Clean spills immediately using approved procedures
  • Follow cleanroom waste management protocols

Emergency Procedures

  • Vacuum failure → stop process immediately
  • Sample detachment → stop system and inspect
  • Chemical spill → follow spill response procedures
  • Electrical fault → power down system and notify staff
  • Unusual vibration or noise → stop operation immediately
  • Do not resume operation until the system has been inspected and cleared.

General Cleanroom Conduct

  • Use only approved materials and spin processes
  • Maintain cleanliness of chamber and chuck
  • Avoid cross-contamination between processes
  • Follow manufacturer-defined procedures and limits
  • Report equipment issues promptly