[labnetwork] E-Beam Evaporation, Ni optimization.

[Iulian Codreanu]

I second Bill's motion.  It would be best if we limited the discussions 
to topics that provide the environment (infrastructure, equipment, 
safety, management, billing, etc) that allows our customers to do their 
work.

One could ignore items that are not of interest but I am concerned that 
the forum may be "flooded" with process-related questions.

Iulian

iulian Codreanu, Ph.D.
Director of Operations, UD Nanofab
149 Evans Hall
Newark, DE 19716
302-831-2784

On 7/31/2013 5:01 PM, Charles Ellis wrote:
> I could be wrong as the original intent  of this forum, but I welcome 
> the process questions..  I think it is a great place for the old guys 
> like me and some of you to share our experiences and maybe help some 
> of these young guys.  As a lab manager I also welcome the operations 
> discussions -- it does not seem that this forum is overly busy and so 
> I vote we encourage process questions as well as operational 
> questions.  It seems to have been working quite well so far. I very 
> much enjoy the traffic I have seen over the years..
>
> Just my 2 cents!
>
> Charles Ellis...
> Auburn..
>
> From: Bill Flounders <bill at eecs.berkeley.edu 
> <mailto:bill at eecs.berkeley.edu>>
> Date: Wednesday, July 31, 2013 2:00 PM
> To: Chandrashekar S Kambar <kambar009 at gmail.com 
> <mailto:kambar009 at gmail.com>>, "labnetwork at mtl.mit.edu 
> <mailto:labnetwork at mtl.mit.edu>" <labnetwork at mtl.mit.edu 
> <mailto:labnetwork at mtl.mit.edu>>
> Subject: Re: [labnetwork] E-Beam Evaporation, Ni optimization.
>
> Chandrashekar S Kambar,
> Lab Network is primarily for operations discussions
> or facility wide issues rather than detailed nanofabrication questions.
> Please consider the mems talk venue for
> questions at this level of process detail.
> I also encourage you to contact Process Support
> at CHA Industries
> http://www.chaindustries.com/
>
> I welcome dissenting opinion from the network
> if I have misrepresented our forum.
>
> Thank you
> Bill Flounders
> UC Berkeley
>
>
>
> Chandrashekar S Kambar wrote:
>>
>> Hi,
>>
>> We are trying to optimize Ni with E-Beam Evaporator (TECPORT).
>>
>> The E-Beam power is raised in two steps: RAISE 1, SOAK 1 AND RAISE 2, 
>> SOAK 2.
>> ELECTRON BEAM PATTERN: Focused to one point (to the middle of the 
>> crucible).
>> CRUCIBLE: Graphite.
>>
>> ISSUE: During the RAISE 1, everything seems to be normal and only the 
>> material in the middle of the crucible gets melted. During the RAISE 
>> 2 the material starts to spit out of the crucible. During the 
>> deposition the spitting increases drastically, thus we will be forced 
>> to stop the deposition. After the deposition when we take out the 
>> crucible, crucible was broken across the wall. However there was no 
>> damage done to the pocket holder (Hearth).
>>
>> Power % : Raise 1: 5% (V= 6.99 KV and I ~ 70 mA)
>>                 Raise 2: 10% (V= 6.99 KV and I ~ 120 mA)
>>                 During the deposition Power % goes up to 16% and the 
>> current goes up to 180 mA ( V = 6.99 KV constant).
>>
>> We need to know, if there is any way to reduce the crucible cracking 
>> and to avoid the spitting of the material.
>>
>> QUESTION 2:
>>
>> During the deposition the crucibles are cracked and its pieces are 
>> stuck with the Ni material. Is there any way to recover the material 
>> by removing the graphite pieces?
>>
>> Thanks and Regards,
>> Chandrashekar S Kambar.
>>
>>
>>
>>
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>
>
>
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