Mary Tang mtang at
Wed Mar 14 12:20:05 PDT 2007

Hi Colin --

This sounds fine to me (Mahnaz, what do you think?)  But please dispose 
of excess solution in the solvent carboy (it is chemically compatible) 
--please do not transport chemical waste out of SNF.  (Stanford has a 
lot of rules about transporting chemicals around campus.)  Please check 
in with Mahnaz or Ed before proceeding.



Colin Reese wrote:
> Mary,
> To be honest, I am totally unsure as to the content of this stuff. 
> From the description, it looks great, and may even be something to 
> check out for our flashing problem with liftoff with standard litho. 
> The nice part is that it's soluble in standard developer and liftoff 
> solvents. If I remember correctly, this is not the case with LOL. The 
> only major disadvantage I see at the moment is its short shelf life. 
> I'll deal with that if/when it works. Did you see the 
> bake-temperature-dependent developing profiles in the spec sheet? That 
> is pretty neat, if you ask me.
> Usage would be as follows:
> Applied in solution form on Headway2 at the litho bench, using my own 
> disposable syringes and filters. Solution deposited on Al foil during 
> spin-coating would be collected and disposed of with 
> solvent-contaminated waste as is PR when it is cleaned post-usage.
> The excess solution in syringe may either be disposed of in the 
> carboys, or I can transport it to my lab for disposal as organic 
> waste. It's pretty much going to the same place either way.
> It would then be baked on a hot-plate in the litho area, with Al foil 
> disposed of as above.
> Resist would be coated on the litho track, exposure on KSI or KSII and 
> then developed on the developer track. This would produce as much 
> waste of the ARC as the exposed features of a 750A film. If this is an 
> issue, I can hand-develop and dispose of the waste as you see fit.
> That should be about it. Please let me know if you have any questions.
> Colin
> Mary Tang wrote:
>> Hi Colin --
>> You know, I'm not sure.  There any many BARC's approved, but I don't 
>> off-hand recall one from Brewer....  So, if you don't mind, let's 
>> consider this a SpecMat request.  You've already provided an 
>> applications guide and MSDS.  Could you please provide some 
>> additional information about where (which equipment, which wet 
>> benches/ovens/hot plates) and how (namely, what waste is anticipated 
>> and where is it going) you plan to use this?  Yes, we have a 
>> freezer/refrigerator in the lab (behind the implant area) where 
>> flammable-compatible chemicals are stored.  To store a chemical 
>> there, you'll need to get a yellow label and a barcode from Mahnaz or 
>> Ed.
>> By the way, I take it this is for your resist lifting-on-PDMS 
>> problem?  (Cool!  Any idea what the basic chemistry of the "polymer 
>> solids" is?)
>> Thanks,
>> Mary
>> Colin Reese wrote:
>>> Mary,
>>> Can you tell me if the Brewer Science Wide8B BARC has been approved 
>>> for use in SNF yet? I have attached the specs and the MSDS. It 
>>> contains NMP, cyclohexanone, tetrahydrofurfuryl alcohol, and a few 
>>> proprietary ingredients. Looks like good stuff. Develops with 
>>> standard developer and is compatible with liftoff. I got a free 60mL 
>>> sample in the mail today.
>>> Also -- is there a chemical freezer in SNF?
>>> Thanks,
>>> Colin
>>> -- 
>>> Dear Colin,
>>> Thank you for your interest in Brewer Science materials.  I have 
>>> attached a
>>> copy of the data sheets for all 3 of our i-line materials.  As you 
>>> will see
>>> we have 2 dry etch and 1 wet etch material.  Please feel free to 
>>> contact me
>>> should you have any further questions or need any more information.
>>> I look forward to hearing from you.
>>> Kind regards,

Mary X. Tang, Ph.D.
Stanford Nanofabrication Facility
CIS Room 136, Mail Code 4070
Stanford, CA  94305
mtang at

More information about the specmat mailing list