PLEASE PLEASE help with STS etcher footing problem

Alissa M. Fitzgerald amf at amfitzgerald.com
Thu Oct 20 18:52:03 PDT 2005


I'd look into using stsetch2 (talk to Ed Myers - it isn't quite released
yet, but maybe you could be among the first to get on it).  The footing
problem/stopping on oxide has been solved on the newer generations of DRIE
tools.  Don't waste your time trying to make pigs fly.
 
-Alissa


  _____  

From: Elvis Der-Song Lin [mailto:elvislin at stanford.edu] 
Sent: Thursday, October 20, 2005 3:23 PM
To: stsetch at snf.stanford.edu; p5000etch at snf.stanford.edu
Subject: PLEASE PLEASE help with STS etcher footing problem



Hi my knowledgeable and experienced friends,

 

My groupmember and I have a question regarding methods to minimize the
footing problem when using the STS ether to etch trenches with oxide as etch
stop.  I used the "deep" recipe to etch 120 um deep trenches which are 10 um
wide.  I did about 5 minutes of over etching.  After etching, the footing
was very severe, especially at places where two trenches cross etch other.
The footing was at least 5 um on each side.  Is there a recipe that is tuned
to miniminze the "footing" problem?  Any suggestions will be high
appreciated!

 

-Elvis

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