ALD HfO2 in Prof. McIntyre's Lab

Raghavasimhan Sreenivasan raghavs at
Wed Oct 5 09:38:14 PDT 2005

Hi Ed
i am Raghav, a student in Paul McIntyre's group working on ALD of HfO2. As
far as i remember, the TXRF report said that a number of transition metals
overlap with the Hf signal and iron is one of them. the estimate made in
the TXRF is on the higher side and has some contribution from the Hf in
HfO2. hope this helps clarify things.

Quoting Ed Myers <edmyers at>:

> Ching-Huang,
> I looked over your request.  SpecMat has established TXRF limits for our
> Clean and SemiClean classifications.  Unfortunately, your data shows you
> slightly higher than the allowed contamination limits (1E12
> atoms/cm2).  Since one of the offenders is iron, I am reluctant to
> recommend approval of your sample.  Is there a chance the system could be
> cleaned to clear up some of the contamination?
> Regards,
> Ed
> At 10:59 AM 10/4/2005, Ching-Huang Lu wrote:
> >Dear Committee,
> >
> >Raghav and I  have been trying to build transistors with ALD HfO2 in
> Prof.
> >McIntyre's Lab.
> >We would like to get this ALD film certified so that we can start the
> >processing in the semi-clean tools.
> >Attached please find the TXRF data file. This TXRF data obtained on our
> >ALD HfO2 shows that the film is pretty clean.
> >Please let us know if you have any question or need more information.
> >
> >thanks
> >
> >Ching-Huang
> >

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