Ultrasonic cleaning will not work. You may have some luck with bleach at
about 60C but the best way to clean carbonacious debris is with an
oxygen plasma. Use an RIE or barel asher. For RIE 200-300 mTorr and
200-300 watts RF works well. You might still have problems with the high
aspect ratio holes, i.e. the 20um ones, so you might need to increase
the pressure still more for those.

-Mike Martin
 U of Louisville

>>> [email protected] 11/25/2004 11:53:19 AM >>>
Hello

I am looking for a method to clean the holes'  walls  of polyimide and
Mylar films.

The holes was drilled by excimer laser.
The diameters of holes are in 20um~125um.
PI or Mylar film's thickness is 100um.
There are debris , carbine and carbon black sticking on the surface and
wall of holes.
I have tried to clean them with acetone .
But obviously I cannot reach the wall of the holes.

Can ultrasonic cleaning work it out?
How much should be power and frequency of the ultrasonic cleaner ?
Is there any kind of solvent can help to clean them?

Thanks in advance

Oliver Tseng

Project Manager
K-Jet Laser Tek. Inc.
www.kjet.com.tw
Taiwan


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