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<B0101>
Azonenberg: Hi, don't know if you have gotten my previous messages, but I said that I will be using GaAs wafers for DQD's and SQD's
<azonenberg>
I saw them, just been busy and havent responded much
<azonenberg>
I'm working on improving litho resolution
<B0101>
ok, sorry if I had disturbed you
<B0101>
I am working on lithography too, well, I used chrome on glass and UV 365nm light and used a 9X reduction lens
<azonenberg>
very nice, how well did it work?
<azonenberg>
I'm actually about to order a film mask from laserlab.com
<azonenberg>
going to try 12.5um mask shrunk 10x to get 1.25um design rules
<B0101>
not quite done yet, still have some defects and blurring, but will experiment further
<B0101>
and the photoresist I am using is a spray-on resist
<soul-d>
pcb stuff called SR80 or close to it?
<soul-d>
i trew my spray can out might be something difrent though spray on plastic :P
<B0101>
soul-d: my resist, according to label is called KCS800
<B0101>
well, found it at a PCB kit store
<B0101>
for some reason, the labels are pretty vague (in the sense of tech data), only writes KCS800 and writes: "wear gloves while using" and "poison"
<soul-d>
:)
<B0101>
well, one of my friends had tried caustic soda as a developer, didn't work well (result was *very* bad)
<B0101>
well, it was an act of stupidity though, the shopkeeper warned us not to use caustic soda
<soul-d>
k for my premade pcb it works good enough i guess
<soul-d>
still need to call distributor here if they carry the pcb resist chemical also vague number name :)
<azonenberg>
B0101: Dilute it
<azonenberg>
I use 1% NaOH
<B0101>
well for my resist, even a bit NaOH would strip off the whole resist (even the unexposed parts), so I decided to use commercial developer.
<B0101>
and going on, I was surprised to find spray-on chrome in a shop for dresses and gowns, so I decided to use it for photomask making, It works fine for contact lithography but It does not work well on reduction optics lithography
<soul-d>
now we are wondering ofcourse what where you doing in a shop for dresses and gowns :)
<azonenberg>
Did you have adhesion problems?
<azonenberg>
I usually soft-bake my resist on a hot plate at 100C for 30 sec or so
<azonenberg>
after spin coating before developing
<azonenberg>
i also will clean the wafer in acetone and IPA immediately before coating
<B0101>
azonenberg: nope no adhesion problems
<azonenberg>
Hmm, interesting
<azonenberg>
must be a different resist chemistry
<B0101>
soul-d: was buying a few dresses, so no questions about that, but spray on chrome there? i didn't expect it
<B0101>
each can costs like 1.50 USD (converted currency) per can
<soul-d>
donno if chrome is safe but would dislike metals in my clothes
<B0101>
heh, nobody does :)
<soul-d>
cool stuff :)
<azonenberg>
soul-d: Metallic chrome is relatively safe
<azonenberg>
Trivalent salts are mildly toxic but chromium chloride is actually a trace nutrient (just don't eat more than X milligrams a day)
<azonenberg>
Hexavalent salts are very nasty
<soul-d>
yeah still need to study stuff like that ,cause they keep adding stuff i don't know to my food those are mono type's added with the line " more taste"
* B0101
goes out for lunch
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