Subject: | |
From: | |
Date: | Tue, 18 Jun 96 09:16:42 EST |
Content-Type: | text/plain |
Parts/Attachments: |
|
|
Hi John;
One of the additional things that you will need is a 5% H2SO4 wash between
the developer and the etcher. This will remove a conversion coating (think
it's a zinc compound) that makes the double treat more difficult to etch.
This is especially critical with fine lines. The other problem that we have
run into is that the double treat, because of the surface topography, tends
to lock in photoresist and make it harder to strip. Finally, make sure that
you have good drying through the wet chemistry steps (DES etc.) the double
treat tends to take and show stains real well if left to air dry after any
of these operations.
Hope this helps.
Greg Schroeder
______________________________ Reply Separator _________________________________
Subject: FAB: Double Treated Copper
Author: [log in to unmask] at SMTPLINK-HADCO
Date: 6/18/96 11:41 AM
Address,
We have a rep from EIS that is trying to sell us some Double
Treated Copper (aka Trick-o-Treat Copper). As with anything there
are pro's and con's to materials. I am slightly familiar with
some of these pro's and con's of double treated copper, based on
past readings. What I do know about it:
1. It eliminates Black oxide and Chemical/Mechnical Scrubbing
process
2. Resist adhesion is improved due to the copper topography
3. Handling parameters are increased prior to resist lamination
(since there is no cleaning process prior)
4. There are difficulties in AOI-ing the layers
5. Prepreg adhesion is improved at the lamination stage
6. Is it true that new equipment is needed to process this
material? EIS says no, but others I spoken with say yes.
7. Is oxide necessary when processing double treated polyimide
layers. RBO (Atotech) is a recommended oxide for polyimide
layers and improves prepreg adhesion?
8. etc.,
Please add any additional information you may have that can help
in our evaluation. We have some double treated samples that we
will be testing soon. Thank you in advance.
John Gulley - PE
Dallas, TX
|
|
|