Etching away copper surface deposition on wafer

[Vlasta]

Guys

sorry for the cross posting but is there any way that the copper on these could be etched off without too many dangerous chemicals?

http://www.cpu-world.com/forum/viewtopic.php?t=18805

Steve

[JAC]

In PCB manufacture copper is etched off with Ferric Cloride



Nasty stuff, I hate using it. Maybe a weak solution will do the trick? Worth trying.


Also.. I know little about these wafers.. I didnt realise there was copper there.. what is the purpose of the copper - as a thermal interface?


edit: Found this.. looks interesting:

http://www.instructables.com/id/Stop-using-Ferric-Chloride-etchant!--A-better-etc/

[Vlasta]

JAC this is great information - do you think this would work on a wafer with copper deposition or would it be better to mechanically polish?

[Vlasta]

i think it is either a power interconnect, a ground plain or a shield

[kosmokrator]

I DONT thin this is copper thin metlization on this Waffers...... Maybe is Incomplete And im wrong ....
try a Bath with ferric Cloride s JAC sugested And Soon u See if is Copper or not