Specific Process Knowledge/Etch/Etching of Titanium

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Etching of Titanium

Etching of titanium can be done either by wet etch, dry etch or by sputtering with ions.

• Etching of Ti by wet etch
• Etching of Ti by dry etch
• Sputtering of Ti

Comparison of Titanium Etch Methodes

	Ti wet etch 1	Ti wet etch 2	ICP metal	IBE (Ionfab300+)
Generel description	BHF Etch of titanium with or without photoresist mask.	Cold RCA1 mix etch of titanium (as stripper or with eagle resist).	Dry plasma etch of Ti	Sputtering of Ti - pure physical etch
Etch rate range	~?nm/min	~?nm/min	~50-200 nm/min (depending on features size and etch load and recipe settings)	~20nm/min
Etch profile	Isotropic	Isotropic	Anisotropic (vertical sidewalls)	Anisotropic (angles sidewalls, typical around 70 dg)
Substrate size	Any size and number that can go inside the beaker in use	Any size and number that can go inside the beaker in use	smaller pieces on a carrier wafer #1 100mm wafers (if you place it/bond it on a 150 mm carrier wafer) #1 150mm wafers	Smaller pieces glued to carrier wafer #1 50mm wafer #1 100mm wafer #1 150mm wafer #1 200mm wafer
Allowed materials	No restrictions cross contamination wise as long as you use the right beaker and make sure that they are safe to enter in the chemicals	No restrictions cross contamination wise as long as you use the right beaker and make sure that they are safe to enter in the chemicals	Silicon Quartz/fused silica Photoresist/e-beam resist PolySilicon, Silicon oxide Silicon (oxy)nitride Aluminium Titanium Chromium	Silicon Silicon oxides Silicon nitrides Metals from the +list Metals from the -list Alloys from the above list Stainless steel Glass III-V materials Resists Polymers Capton tape