Using SEM with Quartz. FAQ: xxxx

ToeCutter toecutter4ranger at
Wed Jul 29 19:52:20 PDT 2009

The substrate is charging up with negative space charge on the surface  
of the wafer which then deflects the beam away from that spot.

Coat w espacer 320z 3000 rpm 40 sec no bake. Later it strips off clean  
in DI water.

Or you can coat by evaporation or sputtering any conductive metallic  
film or carbon. Typically 40 to 100 angstroms of Cr Au or Pd for a  
fine grade conductive surface.

Finally use a strip of carbon tape or on some sem stages a wire clip  
and ground the substrate to the stage to ensure ground connection.

Chase your dreams...

On Jul 28, 2009, at 4:48 PM, "Jamal L. Molin" <molinj1 at> wrote:

> Hi James,
> I have been trying to SEM my nanochannel patterns on the test wafer  
> that I
> had etched.  However, I tried yesterday and again today with help from
> another REU student and neither of us have been able to find my  
> patterns
> on the SEM4160.  Is it more difficult because quartz is transparent?
> Would you have anytime this week to help me in SEMing my patterns?
> Thanks,
> Jamal Molin
> UMBC 2011
> Computer Engineering Major
> Meyerhoff Scholar (M-19)

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