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<p class="MsoNormal"><span style="color:#1F497D">Hi Leif,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">We actually have a lot of users who use PDMS for various uses here at Ohio State, including soft lithography. We allow it in most of our tools, including our plasma tools and metal deposition chambers that are
reserved for high quality contacts with the requirement that the PDMS must be fully cured. We do allow some users to cure the PDMS on benchtops or hotplates in the cleanroom itself as well.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><br>
We have not seen any problems with it, but we are not processing CMOS type structures. Mainly we deal with compounds III-V, III-N, ceramics, etc.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">I think it depends on what kind of user base you have, but in our case it would have excluded a lot of users to disallow it. However, we would have forbidden it if we felt that it would contaminate or found
any contamination issues. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">I’ve copied our lab manager Paul in case he may have more to add on the subject.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Best of luck,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Aimee<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> labnetwork-bounces@mtl.mit.edu [mailto:labnetwork-bounces@mtl.mit.edu]
<b>On Behalf Of </b>Leif Johansen<br>
<b>Sent:</b> Wednesday, November 25, 2015 3:58 AM<br>
<b>To:</b> labnetwork@mtl.mit.edu<br>
<b>Subject:</b> [labnetwork] How do you handle PDMS in a cleanroom environment?<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Dear Lab Network, <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I have a dilemma. Polydimethylsiloxane (PDMS) is a promising material for soft lithography, and a lot of our users have a strong wish to process this material in our lab – especially for making nanoimprint stamps . However, before being
cured, PDMS is basically a silicone oil, and all our front end engineers (plasma chambers, lithography etc. ) are really scared about this substance ending up in their equipment. Our back end engineers (especially the wire bonding engineer) is also strongly
opposed to the introduction of PDMS into the back end lab. <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Are there any experience out there in the community on how to handle PDMS in a cleanroom environment?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Best regards, <o:p></o:p></p>
<p class="MsoNormal">Leif<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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