FW: Gold

Ed Myers edmyers at stanford.edu
Fri Jan 15 13:28:09 PST 2010


All,

The potential lab member is anxious as they have a SBIR deadline.
Ed


Dear Ed,

Wanted to follow up on the SPECMAT approval. Can you let me know a time
frame by which we will know the approval.

Thanks

Thulasi

At 04:49 PM 1/13/2010, Mary Tang wrote:
>Hey Ed --
>
>
>Good test case.  We've talked about this for long enough.  I suggest 
>we approve one of our furnaces for this purpose, with a few, key caveats.
>Thermcopoly1?  We'll need to inform the few people who use this system.
>Caveats might be:
>
>- substrates with noble metals allowed
>- no substrates containing materials that will react at process 
>temperatures with Cl-
>
>
>Alternatively, we can start conservatively and define "trace" metals 
>at concentrations typical for catalytic nanowire growth.  Trace 
>metals we've seen (that I know of) for nanowires include iron and 
>silver -- I think there are concerns about the volatility of iron 
>chlorides at thermal oxidation temperatures, but don't know about 
>poly LPCVD temperatures.  So, I don't know if we want to be more 
>specific about what acceptable "trace" metals are.  Trace noble 
>metals only?  I don't know, I think I favor allowing noble metals.
>
>
>Should we be concerned if the nanoporous alumina substrate has any 
>other major components other than alumina?
>
>
>Mary
>
>
>
>
>Ed Myers wrote:
>>All,
>>
>>Here is a request from an anxious prospective lab member to convert 
>>one of our doped poly furnaces to gold contaminated.  They are 
>>under a SBIR deadline, so they are anxious to have a resolution.
>>
>>Ed
>>
>>
>>>x-cr-puzzleid: {028F3430-F240-4D74-87CE-CA49A4A1876C}
>>>x-cr-hashedpuzzle: AUex AzNj BTV9 ED3A ESpk FqN2 GbDh HjbJ HmqB 
>>>Hx/A IRYW IVcD I+Hu JBjW Kkrg 
>>>L6h2;1;ZQBkAG0AeQBlAHIAcwBAAHMAdABhAG4AZgBvAHIAZAAuAGUAZAB1AA==;Sosha1_v1;7;{028F3430-F240-4D74-87CE-CA49A4A1876C};dABoAHUAbABhAHMAaQBkAGgAYQByAGEAbgAuAGcAYQBuAGQAaABpAEAAZAB4AHIAYQB5AC4AYwBvAG0A;Wed, 
>>>13 Jan 2010 21:22:48 GMT;RgBXADoAIABHAG8AbABkAA==
>>>Subject: FW: Gold
>>>Date: Wed, 13 Jan 2010 13:22:48 -0800
>>>X-MS-Has-Attach: yes
>>>X-MS-TNEF-Correlator:
>>>Thread-Topic: Gold
>>>Thread-Index: AcqTCLmLOumGV0zxQ22RekcwmIFejAAAPdLQAGMrzvA=
>>>From: "Thulasidharan Gandhi" <thulasidharan.gandhi at dxray.com>
>>>To: "Ed Myers" <edmyers at stanford.edu>
>>>
>>>Dear Ed,
>>>
>>>This is the package which I sent to specmat group. Can you let me know
>>>if you need anything else.
>>>
>>>Thanks
>>>
>>>Thulasi Gandhi
>>>
>>>
>>>
>>>To SpecMat Committee:
>>>
>>>We would like to grow Si nanowires using a template process using
>>>Stanford Nanofabrication facility. The template which we will be using
>>>is nanoporous alumina template with few nanometers of gold
>>>electrodeposited into the pores which will act as a catalyst for growth
>>>of Si nanowires. Since gold is a contamination I would like to request
>>>you permission to assign a poly furnace for growth of Si nanowires under
>>>the gold contamination equipment set. I have attached a paper which
>>>shows the growth process of Si nanowires using a template process using
>>>gold as a catalyst. If you need any other information, I will be ready
>>>to provide you.
>>>
>>>Thanks
>>>
>>>Thulasi Gandhi
>>>
>>>1) Contact Information:
>>>
>>>DxRay Inc
>>>19355 Business Center Drive, Suite 10, Northridge, CA-91324 Contact
>>>Person: Thulasi Gandhi Ph no: 8182800177 ext107 email:tgandhi at dxray.com
>>>
>>>2)Material: The Material which we are proposing to use is gold.
>>>
>>>3)Process: The process which we will be developing is CVD growth of Si
>>>nanowires onto a nanoporus alumina template using gold as a catalyst.
>>>
>>>4)Quantity: The substrate size is around 1/2" in diameter
>>>
>>>5)Storage: There won't be any storage of the substrates at SNF.
>>>
>>>6)Disposal: There won't be any disposal of the substrates at SNF.
>>>
>>>
>>>
>>>-----Original Message-----
>>>From: Ed Myers [mailto:edmyers at stanford.edu]
>>>Sent: Monday, January 11, 2010 1:55 PM
>>>To: Thulasidharan Gandhi
>>>Subject: RE: Visit to See Silane Setup on 01/06/09
>>>
>>>Thulasi Gandhi,
>>>
>>>The link is a couple of pages deeper
>>>
>>>http://snf.stanford.edu/Materials/NewMatProc.html
>>>
>>>Ed
>>>
>>>At 01:50 PM 1/11/2010, you wrote:
>>> >Dear Ed,
>>> >
>>> >I checked for the paperwork at the spectmat group, but could not find
>>> >one. Should I send an email and request them? We want to make sure we
>>> >get an approval from them before signing in for the training and making
>>>
>>> >a open purchase order for using the facility. Can you guide me through
>>> >on this.
>>> >
>>> >Thanks
>>> >
>>> >Thulasi Gandhi
>>> >
>>> >-----Original Message-----
>>> >From: Ed Myers [mailto:edmyers at stanford.edu]
>>> >Sent: Monday, January 11, 2010 1:21 PM
>>> >To: Thulasidharan Gandhi
>>> >Cc: specmat at snf.stanford.edu; maurice stevens
>>> >Subject: RE: Visit to See Silane Setup on 01/06/09
>>> >
>>> >Thulasi Gandhi,
>>> >
>>> >Yes, we have a poly-silicon furnace plumbed with both dopants.  Right
>>> >now it is for clean samples, where your sample would be considered gold
>>>
>>> >contaminated.  I have copied the specmat group which is responsible for
>>>
>>> >any changes to our cleanliness or contamination levels.  To run what
>>> >you ask, does require this group to assign a poly furnace to the gold
>>> >contaminated equipment set.  If you want to make this change, you will
>>> >need to fill out the paperwork starting at
>>> >http://snf.stanford.edu/Materials/Materials.html
>>> >
>>> >Also, there will be a memory effect as you switch dopant gases.  This
>>> >should be factored in to your process planning.  If you don't remove or
>>>
>>> >seal the dopants, you will get a lot of compensated doping and not
>>> >sharp dopant transitions.
>>> >
>>> >Regards,
>>> >Ed
>>> >
>>> >
>>> >At 11:01 AM 1/11/2010, Thulasidharan Gandhi wrote:
>>> > >Dear Ed Myers,
>>> > >
>>> > >It was nice meeting you the other day and knowing about the research
>>> > >capabilities you have. We have one final question before we go ahead
>>> > >with the application for training and using your facility.
>>> > >
>>> > >This is what we are planning to do: We are planning to grow Si
>>> >nanowires
>>> > >onto alumina template.
>>> > >
>>> > >We will have gold deposited into the alumina template and grow the Si
>>>
>>> > >nanowires using silane at around 500C. In the growth of Si nanowires
>>> > >we want to dope phosphor and boron alternatively to grow PN Si
>>>nanowires.
>>> > >The other day you told us that your system is capable of doping
>>> >phosphor
>>> > >and boron. We want to once again make sure whether it can be done by
>>> > >switching the gas supply.
>>> > >
>>> > >Thanks
>>> > >
>>> > >Thulasi Gandhi
>>> > >
>>> > >-----Original Message-----
>>> > >From: Ed Myers [mailto:edmyers at stanford.edu]
>>> > >Sent: Wednesday, January 06, 2010 7:43 AM
>>> > >To: Thulasidharan Gandhi
>>> > >Subject: RE: Visit to See Silane Setup on 01/06/09
>>> > >
>>> > >Thulasi Gandhi,
>>> > >
>>> > >Yes, I do have to make a change.  Last night I was not by my calendar
>>>
>>> > >and I forgot about a 1:30-3pm training I have to provide today.  Can
>>> > >we meet after 3pm?
>>> > >
>>> > >Regards,
>>> > >Ed
>>> > >
>>> > >
>>> > >At 07:47 PM 1/5/2010, you wrote:
>>> > > >Dear Ed Myers,
>>> > > >
>>> > > >Thats ok. I am not sure whether we can make it before 10 am. So i
>>> > > >think 1-3 pm should be ok with us. I will meet you tomorrow at 1pm.
>>> > > >Let me know if there is any changes.
>>> > > >
>>> > > >Thanks
>>> > > >
>>> > > >Thulasi Gandhi
>>> > > >
>>> > > >
>>> > > >----------
>>> > > >From: Ed Myers [mailto:edmyers at stanford.edu]
>>> > > >Sent: Tue 1/5/2010 7:12 PM
>>> > > >To: Thulasidharan Gandhi
>>> > > >Subject: Re: Visit to See Silane Setup on 01/06/09
>>> > > >
>>> > > >Thulasi Gandhi,
>>> > > >
>>> > > >I found out late today, I have to participate in a phone conference
>>>
>>> > > >at 11am on Wednesday.  On Wednesday, I have time before 10am or
>>> > > >between 1-3pm.  Sorry for the late change, but please let me know
>>> > > >if either of these times will work for you.
>>> > > >
>>> > > >Regards,
>>> > > >Ed
>>> > > >
>>> > > >
>>> > > >At 02:51 PM 1/4/2010, you wrote:
>>> > > > >Dear Edward Myers,
>>> > > > >
>>> > > > >I just spoke to you over the phone about visiting your lab on
>>> > > > >Wednesday (01/06/09) at 11am. You can email me back the
>>>directions.
>>> > > > >
>>> > > > >Thanks for your help.
>>> > > > >
>>> > > > >Regards,
>>> > > > >
>>> > > > >Thulasi Gandhi
>>> > > >
>>>
>>>
>
>
>--
>Mary X. Tang, Ph.D.
>Stanford Nanofabrication Facility
>CIS Room 136, Mail Code 4070
>Stanford, CA  94305
>(650)723-9980
>mtang at stanford.edu
>http://snf.stanford.edu





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