02:40 <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

02:41 <azonenberg> I saw them, just been busy and havent responded much

02:41 <azonenberg> I'm working on improving litho resolution

02:41 <B0101> ok, sorry if I had disturbed you

02:46 <B0101> I am working on lithography too, well, I used chrome on glass and UV 365nm light and used a 9X reduction lens

02:56 <azonenberg> very nice, how well did it work?

02:56 <azonenberg> I'm actually about to order a film mask from laserlab.com

02:56 <azonenberg> going to try 12.5um mask shrunk 10x to get 1.25um design rules

02:59 <B0101> not quite done yet, still have some defects and blurring, but will experiment further

03:01 <B0101> and the photoresist I am using is a spray-on resist

03:02 <soul-d> pcb stuff called SR80 or close to it?

03:03 <soul-d> i trew my spray can out might be something difrent though spray on plastic :P

03:05 <B0101> soul-d: my resist, according to label is called KCS800

03:06 <B0101> well, found it at a PCB kit store

03:08 <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"

03:11 <soul-d> :)

03:14 <B0101> well, one of my friends had tried caustic soda as a developer, didn't work well (result was *very* bad)

03:17 <B0101> well, it was an act of stupidity though, the shopkeeper warned us not to use caustic soda

03:19 <soul-d> k for my premade pcb it works good enough i guess

03:19 <soul-d> still need to call distributor here if they carry the pcb resist chemical also vague number name :)

03:21 <azonenberg> B0101: Dilute it

03:21 <azonenberg> I use 1% NaOH

03:23 <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.

03:25 <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

03:26 <soul-d> now we are wondering ofcourse what where you doing in a shop for dresses and gowns :)

03:28 <azonenberg> Did you have adhesion problems?

03:28 <azonenberg> I usually soft-bake my resist on a hot plate at 100C for 30 sec or so

03:28 <azonenberg> after spin coating before developing

03:28 <azonenberg> i also will clean the wafer in acetone and IPA immediately before coating

03:29 <B0101> azonenberg: nope no adhesion problems

03:29 <azonenberg> Hmm, interesting

03:29 <azonenberg> must be a different resist chemistry

03:31 <B0101> soul-d: was buying a few dresses, so no questions about that, but spray on chrome there? i didn't expect it

03:32 <B0101> each can costs like 1.50 USD (converted currency) per can

03:33 <soul-d> donno if chrome is safe but would dislike metals in my clothes

03:34 <B0101> heh, nobody does :)

03:36 <soul-d> cool stuff :)

03:37 <azonenberg> soul-d: Metallic chrome is relatively safe

03:38 <azonenberg> Trivalent salts are mildly toxic but chromium chloride is actually a trace nutrient (just don't eat more than X milligrams a day)

03:38 <azonenberg> Hexavalent salts are very nasty

03:41 <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"