As I understand it, copper is replacing gold especially at small diameters
and has pretty well displaced aluminium at large diameters/ribbons in power
devices (eg IGBT)where its properties are very advantageous. Bonding is done
under local inert or forming gas environment. 
-- 
Regards 
 
Mike Fenner 
Bonding Services & Products
M: +44 [0] 7810 526 317 
T: +44 [0] 1865 522 663

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Syed Ahmad
Sent: Tuesday, April 14, 2015 2:34 PM
To: [log in to unmask]
Subject: Re: [TN] Copper Wire Bonds

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,


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