Stripping removes all photoresist from a chip. This is typically done after an etch step is completed, though it can also be used to remove resist before etching if you need to redo patterning.
Tools
Fume Hood with Sink
N2 gun
Materials
Chip with photoresist
Acetone
Isopropanol
Troubleshooting and Best Practices
Chip flying out of tweezers during nitrogen blow drying
Lie the chip flat on a cleanroom wipe surface while still holding it with the tweezers.
Only apply nitrogen normal to the surface of the chip, so it presses against the cleanroom wipe instead of lifting it up.
Procedure
Stripping
Spray the entire chip with acetone
Rinse with IPA
IPA must always be used after acetone to remove any acetone residue
Dry with nitrogen gun until the surface is entirely dry
This requires you to blow dry the back of the chip as well. Surface tension tends to pull the liquid towards the back
Safety
Be sure to spray the chip over a sink. Do not use near source of high heat.
