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EHS concerns aside, I wouldn't go with the idea for cross-contamination and process control reasons.</div>
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My personal rule of thumb is 1e-6@600C to start the conversation.Pb has a vapor pressure of 1e-6@420C.</div>
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For <600C materials that means they will evaporate before crucible is red hot - hard to tune electron beam and visually control the deposition that way. May be easier with resistive process though.</div>
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The other thing is when you're running something high temperature, like Pt or Mo, things become pretty hot inside. Anecdotally, I had substrate - pretty far away from the source - go above 150C during Pt deposition. I don't know how high the source shutter
would go, but 400C seems pretty plausible. Re-evaporation isn't something people like to think about in terms other than how to avoid that...</div>
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<p style="margin: 0px; font-family: Calibri, sans-serif; font-size: 11pt;"><span style="color: black;">_______________________________________________</span></p>
<p style="margin: 0px; font-family: Calibri, sans-serif; font-size: 11pt;"><span style="color: black;">Michael Yakimov</span></p>
<p style="margin: 0px; font-family: Calibri, sans-serif; font-size: 11pt;"><span style="color: black;">Research scientist</span></p>
<p style="margin: 0px; font-family: Calibri, sans-serif; font-size: 11pt;"><span style="color: black;">Department of Nanoscale Science and Engineering</span></p>
<p style="margin: 0px; font-family: Calibri, sans-serif; font-size: 11pt;"><span style="color: black;">University at Albany - State University of NY</span></p>
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<p style="margin: 0px; font-family: Calibri, sans-serif; font-size: 11pt;"><span style="color: black;">253 Fuller rd.</span></p>
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<p style="margin: 0px; font-family: Calibri, sans-serif; font-size: 11pt;"><span style="color: black;">Phone: 518-437-8609 lab</span></p>
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<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> Tuesday, July 16, 2024 3:57 PM<br>
<b>To:</b> Fab Network <labnetwork@mtl.mit.edu><br>
<b>Subject:</b> [labnetwork] Lead (Pb) evaporation</font>
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<div dir="ltr">Hi All,
<div>Do any of you allow Lead (Pb) deposition on your evaporation tools?</div>
<div>If so, what are the precautions that you take to avoid Lead exposure hazards during PM,etc?<br clear="all">
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<span class="x_gmail_signature_prefix">-- </span><br>
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<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" 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" 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>
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