One may find copper wire coated with Pd to alleviate its corrosion. Copper does make intermetallics with Al but Kirkendall voiding does not occur as in Au-Al bonds. Use of copper as wafer metallization is increasing and thus so is the use of copper wire.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Wayne Thayer
Sent: Tuesday, April 14, 2015 8:21 AM
To: [log in to unmask]
Subject: Re: [TN] Copper Wire Bonds

Hi Victor-

Yes, copper wirebond technology is now available (I've only seen this done as ball bonding). We haven't upgraded our equipment for it as of yet, but the kit isn't real expensive. I understand that the balls are harder, so cratering is probably seen more often. I don't know offhand what temperature the welding is done at.

Aluminum is cheaper,  very easy to bond with (room temperature welding), and doesn't need cover gas. But only available as wedge bonding, which can't match the pitch of balls.

Wayne

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor Hernandez
Sent: Tuesday, April 14, 2015 9:01 AM
To: [log in to unmask]
Subject: [TN] Copper Wire Bonds

Fellow TechNetters:

   What is the story behind Copper Wire Bonds.   I have heard of them but
now I have witness one.   Any details out there on this technology?   I will
have to search archives.

Victor,


______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________

______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask] 
______________________________________________________________________