Specific Process Knowledge/Etch/Wet Platinum Etch

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Etching of Platinum can be done either wet or dry. For wet etching please see below on this page. Dry etching can be done with IBE by sputtering with Ar ions.

Wet Etching of Platinum

Wet Platinum Etch can be done in Fumehood 1 or 2 positioned in cleanroom D-3

Platinum can be etched by the following wet etch:

• H₂O : HCl : HNO₃ (8 : 7 : 1) at 85 °C (note: etching starts at 70 C, 170nm etched in 5 min 70 C-85 C)* Nisoer July 2022

You have to be very careful when you work with this etch. It can generate nitrous gasses which are very toxic!!

At this moment we do not have any information on the etch rate. You should be aware that this wet etch will also etch gold and it is not possible to use any masking material, it is used as a stripper.

Wet etching of Platinum is done by making your own setup in a glass beaker in Fumehood 01 or 02 in Cleanroom D-3. Write content on the beaker and which metals has been etched with yellow permanent pen. You can see the APV here.

Platinum Etch data

	Platinum wet etch
General description	Etch of Platinum
Link to safety APV	see APV/Manual here.
Chemical solution	HCl : HNO3 : H2O (7 : 1 : 8)
Process temperature	85 °C etches at 70 C* Nisoer July 2022
Possible masking materials	None
Etch rate	1-10 nm/min (Not tested. Mainly used as stripper)
Batch size	1-7 4" wafers at a time
Size of substrate	Any that fits into a carrier that can go into the glass beaker
Allowed materials	No restrictions. Make a note on the beaker of which materials have been processed.