Hello,
It sounds like you have tried a "scribe and break" process. This is when
you use a diamond tip to scribe the top surface of the silicon then
apply pressure on the backside to break the cleave mark. It could be
that the wafer is too stressed and not able to break properly.
How is the wafer thinned to the 30µm thickness? The thinning process is
critical to reduce the stress of the wafer. I would guess it was ground
then lapped or polished.
You can also use a dicing saw to cut he wafer to final substrate or die
size. This uses a diamond blade to cut through the wafer, which is
mounted on an adhesive tape or could be waxed onto another silicon wafer
for better support. You can choose the blades specification to achieve
the best cut quality.
If you like I can supply you with the names of companies that perform
dicing, grinding and scribing services. They could perform some test
cuts to show you the results. Or if you are looking to cut your wafers
in house I can also point you in the right direction. You can then
decide what your best option is.
Thank you,
Mario Robles
Tanaka Systems, Inc.
2577 Leghorn Street
Mountain View, CA 94043
650-966-8001 ofc
650-966-1881 fax
www.dicingblades.com
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Esteban Broitman
Sent: Tuesday, April 15, 2003 8:57 AM
To: [email protected]
Subject: [mems-talk] cleaving of ultra-thin Si wafers
Does anybody know how to "cleave" ultra thin Si wafers?
I need to cut, from ultra-thin (30 microns) Si wafers, substrates of ~
10 x 20 mm. I tried to use different kind of diamonds, but I always have
the same problem: the substrate is not more "flexible", if I try to bent
it, it cracks in many parts. I suspect that I am generating defects
during the cutting of the substrates that propagate during the bending.
Any suggestion?.
Thanks for the reply to my e-mail: [email protected]
E. Broitman
----------------------------------
Dr. Esteban Broitman
Senior Research Associate
Department of Chemical Engineering
Carnegie Mellon University
Pittsburgh, PA 15213
Phone: (412) 268-9537
FAX: (412) 268-7139
----------------------------------
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