Re: Lifetime of Al bond pad

"Alex Kaiser" <[EMAIL PROTECTED]> wrote in
news:[EMAIL PROTECTED]: 
> 
> Maybe oxidation is the main problem if the samples were lying aroun
> for several years.
> What about trying to bond one of these?
> If it don't work, maybe a short dip in thinned phosphoric acid may
> help. I have never tried it, so be careful.

They have been in one of those plastic boxes used for wafer 
transportation. Basically it is sealed, but of course gas can penetrate 
although slowly and I do not know what those boxes will outgas over time.

I do not dare to tell Production to use some acid. I do not even want to 
think what might happen .... ;-)

We have bonded on a couple of lots and do not see any concerns so far.

Another source claimed the Al could lump together and we could experience 
lifted metallization. We have done some temp cycling and couldn't found 
anything.

Let's see...

Regards
Volker