<div dir="auto"><div><div>Hi Chris, </div><div dir="auto"><br></div><div dir="auto">Why not put it in a vacuum box? Desicators can also be put under vacuum. </div><div dir="auto"><br></div><div dir="auto">Cheers,</div><div><br></div><div data-smartmail="gmail_signature"><div dir="ltr">Carlos Gramajo<div>Cleanroom Research Scientist</div><div>Shared Equipment Authority (SEA), Rice University</div><div>Cell: 713-470-8115; Office: 713-348-8243; <a href="mailto:cg70@rice.edu" target="_blank">cg70@rice.edu</a></div></div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Tue, May 20, 2025, 7:03 PM Tony Whipple <<a href="mailto:whipp003@umn.edu">whipp003@umn.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>Hello Chris;</div><div><br></div><div>Before the FOUP there was the SMIF system for six inch wafers.<br></div><div><a href="https://en.wikipedia.org/wiki/SMIF_(interface)" target="_blank" rel="noreferrer">https://en.wikipedia.org/wiki/SMIF_(interface)</a><br></div><div>I have not seen either of these with a vacuum option before.</div><div> <br>Regards, Tony W. <br></div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, May 20, 2025 at 3:05 PM Christopher Raum <<a href="mailto:crraum@gmail.com" target="_blank" rel="noreferrer">crraum@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>Hi all,</div><div><br></div><div>I work between two fabs at UC Berkeley and part of my process flow involves shuttling wafers between those two fabs to their respective tools.</div><div><br></div><div>Currently I use a wafer box and double bag to ensure the wafers aren't contaminated by the environment outside the two fab labs. This is generally standard practice for transporting wafers outside a cleanroom.</div><div><br></div><div>But there are more complicated concerns. For example one fab lab has a wetbench used to remove native oxide from wafers, and when the next tool in the flow is in the same fab, I can minimize the regrowth of native oxide - but when I need to transfer between fabs regrowth can become an issue.</div><div><br></div><div>In industry they use a FOUP (Front Opening Unified Pod) to move wafers around while controlling the environment the wafers sees. The pods can be purged with nitrogen (and perhaps placed under vacuum?) and I think they can also be light tight to allow PR coated wafers to be transported in unfiltered light.</div><div><br></div><div><a href="https://en.wikipedia.org/wiki/FOUP" target="_blank" rel="noreferrer">https://en.wikipedia.org/wiki/FOUP</a></div><div><br></div><div>Since it's the industry that uses FOUPs, all the systems are for 12" and above wafers. I know I could never be so lucky, but I'll ask anyway - does anyone know of any FOUP systems that are fitted for six inch wafers?</div><div><br></div><div>Outside that possibility, my ask for the community is: Is there an interest in developing such a system? Some sort of crowdsourcing? There are many members of industry in this mailing list and I'm sure there would be quite a few academic and research customers if someone wanted to develop and fabricate such a wafer transportation system.</div><div><br></div><div>I hope this post stimulates some interesting discussion.</div><div><br></div><div>-Chris</div></div>
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