Resist spin coating

How to behave

• Always think of safety first!
• Wait patiently for the previous user to finish their process in the spin coater and then you can start using the fumehoom.
• Minimise the duration for which the resist bottle stays open (without a lid).
• Clean the spinner and the chuck until there are no resist marks left
  • Use 1,3 Dioxolane for CSAR and LOR3B resists
  • In any other case, use Acetone
• Is a resist missing? Not it in the whiteboard in the gowning area.

How to spin coat

• Log your process in the designated Google-Sheets file (date, name, resist stack):
  • CR1: PC with Olympus microscope
  • CR2: PC with Olympus microscope
• Take the resist from the cabinet
• In a cleanroom wipe, write your name to let users know who is using the fumehood
• Choose the correct chuck with respect to your chip size:
  • <5mm: small chuck
  • 6-10mm: medium chuck
  • >10mm: large chuck
  • 2-inch wafers or larger: No chuck
• Place the chuck on the stage
• Place your chip on the chuck
• Center your chip and press Vacuum
  • If you see that your chip is not centered, repeat this step
• Choose a spinner recipe
• Close the lid
• Choose a pipette
  • Hold the pipette with one hand
  • With the other hand, open the resist bottle
  • Squize a sufficient amount of resist
  • Close the resist bottle
  • Deposit a sufficient amount of resist on your chip via the hole on top of the lid
    • You should cover the entire chip surface
    • Avoid the formation of bubbles
    • You should be able to observe surface tension from the resist liquid on top of your chip
    • You should stop pouring resist before the surface tension collapses and the resist spills on the sides of your chip
• Play the recipe
• While your recipe is running:
  • Return the resist bottle to the designated place in the cabinet
  • Set the timer for baking
    • Rule of thumb:
      • AZ photoresists: 115 \textdegrees C for 1 min
      • e-beam resists: 185 \textdegrees C for 2 mins
• Once your recipe is done, open the lid
• Press Vacuum to disable the vacuum on the back of your chip
• Transfer your chip to the hot plate for baking and start the timer
• Start cleaning the spinner
  • You should spend a significant amount of time cleaning the spinner
    • Clean the chuck
    • Clean carefully inside the spinner, both at the bottom and inside the lid. Don't forget the top hole!
• Remove your sample from the hot plate and store it in your sample box
• Keep cleaning that spinner until it is spotless
• Log your cleaning in the Google-sheets
• Tidy up the fumehood for the next user
• Continue with the next steps of your process