| --- Thu Dec 29 2011 | 00:00 | |
| 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 | 02:40 |
|---|---|---|
| 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 | 02:41 |
| B0101 | I am working on lithography too, well, I used chrome on glass and UV 365nm light and used a 9X reduction lens | 02:46 |
| 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 | 02:56 |
| B0101 | not quite done yet, still have some defects and blurring, but will experiment further | 02:59 |
| B0101 | and the photoresist I am using is a spray-on resist | 03:01 |
| soul-d | pcb stuff called SR80 or close to it? | 03:02 |
| soul-d | i trew my spray can out might be something difrent though spray on plastic :P | 03:03 |
| B0101 | soul-d: my resist, according to label is called KCS800 | 03:05 |
| B0101 | well, found it at a PCB kit store | 03:06 |
| 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" | 03:08 |
| soul-d | :) | 03:11 |
| B0101 | well, one of my friends had tried caustic soda as a developer, didn't work well (result was *very* bad) | 03:14 |
| B0101 | well, it was an act of stupidity though, the shopkeeper warned us not to use caustic soda | 03:17 |
| 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 :) | 03:19 |
| azonenberg | B0101: Dilute it | 03:21 |
| azonenberg | I use 1% NaOH | 03:21 |
| 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. | 03:23 |
| 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 | 03:25 |
| soul-d | now we are wondering ofcourse what where you doing in a shop for dresses and gowns :) | 03:26 |
| 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 | 03:28 |
| B0101 | azonenberg: nope no adhesion problems | 03:29 |
| azonenberg | Hmm, interesting | 03:29 |
| azonenberg | must be a different resist chemistry | 03:29 |
| B0101 | soul-d: was buying a few dresses, so no questions about that, but spray on chrome there? i didn't expect it | 03:31 |
| B0101 | each can costs like 1.50 USD (converted currency) per can | 03:32 |
| soul-d | donno if chrome is safe but would dislike metals in my clothes | 03:33 |
| B0101 | heh, nobody does :) | 03:34 |
| soul-d | cool stuff :) | 03:36 |
| azonenberg | soul-d: Metallic chrome is relatively safe | 03:37 |
| 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 | 03:38 |
| 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" | 03:41 |
| Action: B0101 goes out for lunch | 03:46 | |
| --- Fri Dec 30 2011 | 00:00 | |
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