[labnetwork] Aluminimum source crucible suggestions

[Shivakumar Bhaskaran]

Cliff,

Aluminum needs to be evaporated slowly. Sometimes users will ramp the power faster and due to this the Al tend to come out of the liner and get into gap between the liner and the copper pocket, and this will lead to the cracking of the crucible. With slow ramping also we have seen the liner keeps cracking. So I always use Al without any liner, we have one pocket dedicated only for Al.
If you still want to use liner then try fabmate crucible from lesker
http://www.lesker.com/newweb/evaporation_sources/ebeam_crucibles_fabmate.cfm?pgid=0

Other suggestion is using Tungsten Crucible, but I haven't tested this with Al.

-Shiva

Shivakumar Bhaskaran, Ph.D.
Searle CleanRoom Manager
The University of Chicago
5735 S.Ellis, Room 032
Chicago-60637
Ph:773-795-2297
https://searle-cleanroom.uchicago.edu/

From: labnetwork-bounces at mtl.mit.edu [mailto:labnetwork-bounces at mtl.mit.edu] On Behalf Of Clifford F Knollenberg
Sent: Tuesday, May 31, 2016 12:12 PM
To: labnetwork at mtl.mit.edu
Subject: [labnetwork] Aluminimum source crucible suggestions


Hi All,



We've been having crucible cracking issues with out Al e-beam evaporation source.  In short it cracks its crucible after just a few uses.  This wasn't so bad when it happened ever 4-5 months, but not its happening about every week or two.  I've tried a variety of crucibles, had the most luck with carbon crucible.  Is there anything else out there we should be trying?



Cheers,



Cliff



Clifford Knollenberg

Science & Engineering Associate

Stanford Nano Shared Facilities (SNSF)

Email: cknollen at stanford.edu<mailto:cknollen at stanford.edu>

Tel: 650-723-1675
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