<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<style type="text/css" style="display:none;"> P {margin-top:0;margin-bottom:0;} </style>
</head>
<body dir="ltr">
<div class="elementToProof" style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Hi Youry,</div>
<div class="elementToProof" style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
I believe the fabmate is a metal alloy that has no carbon in it. If you're seeing carbon it's probably from somewhere else in your tool. We regularly do gold deposition with fabmate and don't have any problem.</div>
<div class="elementToProof" style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div class="elementToProof" style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
-Michael</div>
<div id="appendonsend"></div>
<hr style="display:inline-block;width:98%" tabindex="-1">
<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> labnetwork <labnetwork-bounces@mtl.mit.edu> on behalf of Youry Borisenkov <yb2471@columbia.edu><br>
<b>Sent:</b> Friday, January 31, 2025 11:59 AM<br>
<b>To:</b> Fab Network <labnetwork@mtl.mit.edu><br>
<b>Subject:</b> [labnetwork] Gold e-beam deposition - carbon contamination</font>
<div> </div>
</div>
<div>
<p class="x_MsoNormal" style="line-height:12.0pt; background:#FF4D4D"><b><span style="font-size:10.0pt; color:black">CAUTION:</span></b><span style="font-size:10.0pt; color:black"> This email originated from outside of our organization. Do not click links,
open attachments, or respond unless you recognize the sender's email address and know the contents are safe.</span></p>
<div></div>
<div>
<div dir="ltr">
<div>Hi All and happy Friday,</div>
<div>I know it is a topic that has been discussed multiple times, however, I'm still lacking a solution that works and will appreciate you sharing your experience.</div>
<div><br>
</div>
<div>Currently we are using a Fabmate crucible, and getting some carbon contamination . </div>
<div>For clean Gold layers we use thermal evaporation. The films are good but it requires a lot of gold.</div>
<div><br>
</div>
<div>So far we tried using a Molybdenum crucible with and without a spacer. The issue with this approach was that eventually after some time, we get carbon contamination back. I believe it's present in the chamber and eventually a critical mass is built on
top of the gold in the crucible, coming from the chamber.</div>
<div><br>
</div>
<div>Were anyone successful in overcoming carbon contamination in their e-beam deposition overtime? </div>
<div>What are the procedures you are following? Maybe cleaning more frequently?</div>
<div><br>
</div>
<span class="x_gmail_signature_prefix">-- </span><br>
<div dir="ltr" class="x_gmail_signature" data-smartmail="gmail_signature">
<div dir="ltr">
<div style="color:rgb(136,136,136)">Thank you,</div>
<div style="color:rgb(136,136,136)">Youry Borisenkov</div>
<div style="color:rgb(136,136,136)"><a href="https://cni.columbia.edu/columbia-university-clean-room" originalsrc="https://cni.columbia.edu/columbia-university-clean-room" shash="K0vZO8Ddqn4vJWY4LHoJSYsjeUpGUTvr/6OEyGvlLUQYGov+/kiQyl13i3KI7+JYR8/pkE06VCTTK/5njwX8KIcj2fYNAyE2u//wiCS4VSxv7GNTMy6SEr7T8B11pMMaagyLydo6DZBG9d/SxkF/SaZ/Z8BWOdmFnDOX4pfbJz8=" target="_blank">CNI</a></div>
<div style="color:rgb(136,136,136)">Columbia University</div>
<div style="color:rgb(136,136,136)">CEPSR 1017, New York, NY, 10027, United States.</div>
<div style="color:rgb(136,136,136)"><a href="https://sustainable.columbia.edu/crown-commuter" originalsrc="https://sustainable.columbia.edu/crown-commuter" shash="Xcolzpbm/4Xm7kHD7EMzTMsHkFDoXp0EpEZxpikOLU5FMjuGHVIkQYUQYcqsoWn9ZNbQFyKL+Lf2BP0HddDEwz03Z9ZiuKklAEWYTRwWQKCHCSL/z9g73baG8gT1fwfrQCMBdyJxSSys3JRx5RgETcFxdhaVakkDv+PmiSJ8sPU=" target="_blank" style="color:rgb(17,85,204)"><img width="96" height="40" src="https://sustainable.columbia.edu/sites/default/files/content/crown%20commuter%20badge_0.png"></a></div>
</div>
</div>
</div>
</div>
</div>
</body>
</html>