Specific Process Knowledge/Etch/Etching of Chromium

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Etching of Chromium

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

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

Comparison of Aluminium Etch Metodes

	Cr wet etch 1	Cr wet etch 2	ICP metal	IBE (Ionfab300+)
Generel description	Wet etch of Cr that you need to mix your self	Wet etch of Cr premixed	Dry plasma etch of Cr	Sputtering of Cr - pure physical etch
Etch rate range	~100nm/min (pure Al)	~60nm/min (Al+1.5% Si)	~350 nm/min (depending on features size and etch load)	~30nm/min (not tested yet)
Etch profile	Isotropic	Isotropic	Anisotropic (vertical sidewalls)	Anisotropic (angles sidewalls, typical around 70 dg)
Substrate size	#1-25 100 mm wafers	#1-25 100 mm wafers	smaller pieces on a carrier wafer #1 100mm wafers (when set up to 100mm wafers) #1 150mm wafers (when set up to 150mm wafers)	Smaller pieces glued to carrier wafer #1 50mm wafer #1 100mm wafer #1 150mm wafer #1 200mm wafer
Allowed materials	Aluminium Silicon Silicon Oxide Silicon Nitride Silicon Oxynitride Photoresist E-beam resist	Aluminium Silicon Silicon Oxide Silicon Nitride Silicon Oxynitride Photoresist E-beam resist	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