Problem stsetch2 SNF 2010-03-29 16:02:47: Etch rate is not stable

jjeong1 at jjeong1 at
Mon Mar 29 16:02:47 PDT 2010

I ran two wafers to measure Si etch rate. For the first wafer, the etch rate was 3.5um/min, but it dropped to 1.8um/min for the second one. The second one was run right after the first one. 
(Two weeks ago, it was ~7.4um/min and the wafer-to-wafer etch rate was quite stable.) 

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