Topic for #homecmos is now Homebrew CMOS and MEMS foundry design | http://code.google.com/p/homecmos/ | Logs: http://en.qi-hardware.com/homecmos-logs/
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<Sync> gah
<Sync> water condensated on the cooling lines for the HV supply and shorted stuff out
<azonenberg> :(
<azonenberg> on a happier note my roommate brought his lathe up and is setting it up now
<azonenberg> i hope to be machining a spin coater chuck in a few days
<Sync> idk but the dumb machine dies almost weekly :/
<azonenberg> :(
<Sync> well it is 25 years old but still it should not do that
<berndj> azonenberg: vaguely like a 4-jaw chuck?
<azonenberg> berndj: no
<azonenberg> flat plate with suction
<Sync> but now I have free access to ln2 and lithography :)
<azonenberg> the hard part is how to make a spinning chuck
<azonenberg> with suction
<azonenberg> my roommate has some ideas
<azonenberg> Sync: o_O nice
<berndj> how do you get the suction through the spinning bit
<Sync> how fast will it go azonenberg?
<azonenberg> Open question, he has some ideas
<azonenberg> up to ~4k RPM
<Sync> oh, that should be pretty easy
<azonenberg> we'll use a 30k rpm brushless motor and reduce by about 6x with a belt
<azonenberg> current tentative design is to have a small vacuum reservoir in the chuck
<azonenberg> and just try to keep leakage rates low enough
<azonenberg> but we havent tested to measure actual leakage
<Sync> just bore through and attatch a roating coupler
<azonenberg> Thats the other possibility
<Sync> +t
<Sync> also almost every analytic method you would want for wafers :)
<azonenberg> :D
<azonenberg> where is this again?
<Sync> material science lab here at the uni
<azonenberg> very nice
<azonenberg> cleanroom or not?
<Sync> no
<Sync> but the litho is in a class 100
<azonenberg> :D
<Sync> but I have nothing to do with them yet
<azonenberg> can you do film deposition too?
<Sync> that is what I do
<Sync> :P
<azonenberg> Lol
<Sync> investigating how germanium transistors could be made on si substrates
<azonenberg> ooh
<Sync> which is pretty cool
<Sync> the issue is that the crystal lattice of ge does not fit the one of si
<Sync> so you get huge mechanical tensions in the ge layer
<azonenberg> I can imagine
<Sync> which cause it to crack over about 1µ
<azonenberg> Are you doing epitaxy or polycrystalline?
<Sync> so you sputter a layer of sb
<Sync> epitaxy
<azonenberg> But you do it over a non-Si layer?
<Sync> yes
<Sync> si - sb - ge
<azonenberg> So the Si is just a mechanical substrate
<Sync> yes
<azonenberg> and isnt electrically active
<Sync> because it is cheep
<Sync> well, that is currently investigated
<Sync> I think somebody here looks into very thin layers of ge on si
<Sync> like 10nm
<Sync> also building a n2 liquifier as a side project :)
<Sync> azonenberg: just try a rotatable pushin fitting
<Sync> it might not last a lifetime but it'll work
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