Sreemanth
You can get a uniform film by evap of silica on even larger sample. Hoever,
the film will have pinholes and defect in it. Any particle with diameter
larger than ~5nm that is there after sample prep or that get there during
pumping will result in a pinhole since the directional property of evap will
cause it no to be totally buried.

Shay

-----Original Message-----
From: mems-talk-bounces@memsnet.org [mailto:mems-talk-bounces@memsnet.org]
On Behalf Of Sreemanth M Uppuluri
Sent: ד 30 אוגוסט 2006 15:21
To: mems-talk@memsnet.org
Subject: [mems-talk] Evaporation of Silica

Hello Everyone,

I am trying to coat silica films on my samples using e-beam evaporation. I
need a very thin coating (< 20 nm). I am wondering if this thickness is
adequate to ensure coverage over my entire sample (0.5" * 0.5"). Please let
me know if you have any pointers in this matter.