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Gold bonding problem
2002-10-21
Chiatti O
2002-10-24
Mighty Platypus
2002-10-21
Bill Moffat
2002-10-24
Robert C Cole
Gold bonding problem
Chiatti O
2002-10-21
I have the following problem:

I have have an AlGaAs/GaAs chip (a.k.a. HEMT) with Au/Ge/Ni ohmics
and Au gates. The ohmics are covered by a thin layer of what seems
to be gold.
I am supposed to bond gold wires to the ohmics and the gates using
a wedge bonder.
The first time I tried, everything was fine.
The second time, with the same kind of chip and the same processing,
the gold wires do not stick to the ohmics, no matter how often I try.

Has anyone an idea of what is going on?


Olivio Chiatti
Royal Holloway University of London
[email protected]


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