Initial discussion on working with SNF for processing PbS
mahnaz at stanford.edu
Fri Oct 26 15:41:56 PDT 2007
we do not know what kind of lab practice they have, I like to reserve
the right for chloroform till I see how they work.
Mary Tang wrote:
> Hi all --
> I just spoke with Jess and Jim Kruger. Jim is doing the work.
> Envisage would like to use our wafersaw/cmp room to spin coat or dip
> wafers in PbS nanoparticles from various solvents and then do some dry
> etching in the lab. The encapsulation is not likely to be done here
> since we do not have the capability they need.
> I think that as long as they have good handling practices and don't
> store a lot of chemicals here, it would be OK for them to use the
> solvent bench and spin coater there as needed. Jim is advising them
> on the dry etching and will keep them honest. The only chemical I
> have some mild qualms over is chloroform, since its PEL is quite low,
> but if it's in the utility room and they are careful, I think it's not
> really too much of a problem.
> What do you all think? They want to join safety training on Monday.
> Rick Clayton wrote:
>> My name is Rick Clayton, and I am VP of Advanced Materials for
>> InVisage Technologies, an early stage (still stealth mode) technology
>> company working on advanced electronics.
>> We wish to do work within the SNF, and I want to start the process of
>> material approval prior to full engagement.
>> Many of the detailed questions below are more applicable once we are
>> more familiar with your facility, but I will provide a top level
>> description here as a first step in the process of getting our
>> material approved.
>> Core material: PbS
>> associated other materials: Thiols (Mercaptans): Ethane Thiol, Ethane
>> DiThiol, Benzene Thiol (may include other thiols in the future)
>> process chemicals: toluene, chloroform, acetonitrile, acetone, hexane
>> Incoming material:
>> The PbS would be in either powder or solution (toluene, chloroform,
>> hexane, or other non-polar solvent). Typically we would use about
>> 50-100 ml of our material per day.
>> a rough process flow:
>> Our device involves spinning films of PbS onto a substrate (usually a
>> Si wafer), doing some solution processing of the wafer with the
>> thiols, depositing masking materials, etching the PbS film, and then
>> depositing encapsulation materials. Once the wafer is finished we
>> may either die saw or test at wafer level. We will be developing
>> solvent systems and spin profiles to optimize our films.
>> We will be developing masking and etch processes
>> We will be developing encapsulation processes
>> Please provide as much information as you can about your chemical or
>> material. It may very well be the first time anyone on the SpecMat
>> committee has heard of this chemical/material, so it will be your
>> responsibility to educate us. We also have a large archive of
>> chemicals and materials that have been approved, so we may also be
>> able to help you in selecting a chemical or process
>> 1. *Your contact information:* Name, Coral login, phone number,
>> email address and who you work for (your PI or company.)
>> 2. *The chemical or material. *Please provide all common names,
>> trade names, and CAS numbers where appropriate. Include an MSDS,
>> if available; or provide the reason, if not. Make sure to
>> include information for any new secondary chemicals (such as a
>> developer for a new resist). Read the MSDSs as well as the
>> Stanford Chemical Storage Groups
>> <http://snf.stanford.edu/Materials/StorageGroup.html> and the
>> Stanford Chemical Safety Data Base
>> <http://ehs.stanford.edu/servlet/chemsafe.lookup.class> sections
>> on this website to determine the Storage Group Identifier
>> <http://snf.stanford.edu/Materials/StorageGroup.html> and Main
>> Hazard Class
>> <http://snf.stanford.edu/Materials/HazardClasses.html> of your
>> 3. *Vendor/manufacturer info:* address and phone number, website URL.
>> 4. *Reason for request:* Please give serious thought to this. If
>> you have any process information (application notes from the
>> vendor, protocol from another lab, experimental methods section
>> of an article), please include it, preferably as attachments.
>> Ask yourself these questions: Is this the latest procedure? Are
>> there newer/safer alternatives that will also work for my
>> project? Will any of the current SNF approved chemicals and
>> materials work for me?
>> 5. *Process Flow:* Please provide a detailed process flow
>> description on how and where you proposed to use this chemical.
>> This should include *all* *Lab equipment
>> <http://snf.stanford.edu/Equipment/EquipByArea.html> *to be used
>> for processing your wafers once your new chemical or material
>> has been used (even if your new material is a film that is
>> removed, it may still pose potential contamination concerns.)
>> Make sure to include wet benches. Please note that f the
>> chemical/material is to be used in any the "clean"
>> equipment, purity specifications will be needed. This is most
>> important for chemicals/material that are not normally used for
>> VLSI device fabrication. To be allowed into a "clean" tool
>> <http://snf.stanford.edu/Materials/EquipmentLists/Clean.html> ,
>> the material should MOS grade or better.
>> 6. *Amount and form. *How much will you bring in? Is it solid,
>> powder <http://snf.stanford.edu/Materials/Powders.html> or
>> liquid? (Note: as a general rule, powders
>> <http://snf.stanford.edu/Materials/Powders.html> are not
>> permitted in the cleanroom.) Do you need to mix it to use it?
>> 7. *Storage: *Will you be storing your chemical/material at SNF? If
>> so, please note any potential reactivities (this should be on
>> the MSDS). Storage groups
>> <http://snf.stanford.edu/Materials/StorageGroup.html> A,B,D and
>> L are stored in the yellow solvent cabinet in the furnace
>> support area, while storage groups
>> <http://snf.stanford.edu/Materials/StorageGroup.html> C, E, F
>> and G are stored on top of one of the Pass-through Carts. Ensure
>> your chemical container or material is properly labeled
>> <http://snf.stanford.edu/Materials/ChemLabels.html> . If there
>> is no available room, it must be stored by in the bulk storage
>> area. You will then need to obtain it from receiving area
>> personnel each time you want to use it and return it to them
>> when you are finished using it (or each time you leave the lab).
>> Note that there is no storage of chemicals/materials in the
>> processing lab or at any wet bench.
>> 8. *DIsposal*: How will you dispose of any waste or excess chemical
>> or material? In your discussions with experts and vendors, try
>> to determine the best way to dispose of your spent chemicals and
>> by-products. Please refer to the SNF Labmembers Safety Manual
>> <http://snf.stanford.edu/Labmembers/Labmembers.html> for the
>> different methods of waste disposal that are available in the lab.
>> Please get in touch about next steps.
>> Rick Clayton
>> VP Advanced Materials
>> InVisage Technologies
>> mail: 101 College St., South Tower, Rm 312, Toronto, Ontario, Canada,
>> M5G 1L7
>> Office: 416 673 6520
>> mobile: 613 291 6578
>> email: rick.clayton at invisageinc.com
>> <mailto:rick.clayton at invisageinc.com>
>> This email contains information that is confidential. The information
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