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topic 59097

NiCr sputtering on silicon peels off during dicing



December 23, 2012

Q. Hi,

I'm doing NiCr sputtering on Silicon wafers, but I have found a peel-off issue after the dicing process.
Please advise what causes this and how to solve this issue.

Thanks,
Ari

Ari Laksono
- Batam, Indonesia


December 27, 2012

A. Could you describe your purpose and process in some detail ? For example - why NiCr, preparation of substrate, coating parameters like gas, pressure, bias, etching etc., thickness of coating and what is "dicing" - so that readers are a bit enlightened before they can attempt to answer your question.

H.R. Prabhakara - Consultant
bangaloreplasmatek.com - Bangalore Karnataka India


December 28, 2012

A. Hi H.R., I can tell you that the silicon for electronics is formed as a slowly drawn rod of a few inches in diameter, which is then "sliced", like salami, into thin discs. The surface of the disk is divided into dozens or thousands of zones like a large bingo board, and the circuitry for an integrated circuit is created in each of those zones. Subsequently the disk is "diced" into those dozens of individual IC chips. In the dark ages, when I was involved, the slicing and dicing was done with water-cooled abrasive saws, but it may be done with lasers these days.

Regards,

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey


January 1, 2013

Q. Hi H.R and Ted,
thanks for your reply. The silicon that I meant is used for spacer in my device. Therefore to make a good contact, we do a NiCr sputtering on its surface. But lately, the NiCr layer was found peeled off.

Ari Laksono
- Batam, Indonesia


January 3, 2013

A. Assuming the silicon substrate is properly cleaned and the subjected to in situ plasma treatment, it would perhaps help if a thin layer of Cr is coated before depositing NiCr. Depositing at elevated temperatures would also be useful. Excess localized heating during dicing may cause differential thermal expansion leading to delamination.

H.R. Prabhakara - Consultant
bangaloreplasmatek.com - Bangalore Karnataka India

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