Problem pquest SNF 2007-04-24 03:43:25: plasma takes long to strike
jimkruger at yahoo.com
Tue Apr 24 18:24:16 PDT 2007
I looked at the recipe. As part of today's training,
we ran essentially the same recipe and also observed
the delayed strike. We changed (our version of the
recipe, not yours) to increase pressure to 10 mTorr in
step2 (gas stabilize) and to 5 mTorr in the strike
step. Still the standard 2 mTorr in the main etch.
It ignited right a way. I have found this so
effective that I usually reduce the time of the high
power strike step to 5 seconds since it strikes
essentially every time. There is enough power ramp
delay that the high power is on for maybe 2 or 3
seconds of the 5 seconds.
It works because the throttle valve is slow enough
that the pressure remains high in the transient
between steps while the power is ramping up.
--- Thomas O'Sullivan <tdo at stanford.edu> wrote:
> Hi Jim,
> The recipe name is ethrush2.rcp. We have a specific
> step that we wait
> for the plasma to ignite before advancing on to the
> next, lower power
> 200W step.
> jim kruger wrote:
> > Send me the recipe. I have several remedies for
> > or unpredictable striking. Or , I will be at PQ
> > afternoon training ne users.
> > jim
> > --- tdo at snf.stanford.edu wrote:
> >> Had to wait several mins for plasma to strike at
> >> 400W (but it eventually did)
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> Thomas D. O'Sullivan
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