Specific Process Knowledge/Thin film deposition/Deposition of Gold

4th Level - Comparison

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Gold can be deposited by e-beam evaporation or sputtering. In the chart below you can compare the different deposition equipment.

	E-beam evaporation (Alcatel)	E-beam evaporation (Wordentec)	Sputter (Lesker)	Sputter coater Hummer	Sputter coater Balzer
General description	E-beam deposition of Au	E-beam deposition of Au	Sputter deposition of Au	Sputter deposition of Au	Sputter deposition of Au
Pre-clean	RF Ar clean	RF Ar clean	RF Ar clean
Layer thickness	10 Å to 5000Å*	10 Å to 5000Å*	10 Å to
Deposition rate	2 Å/s to 10 Å/s	1 Å/s to 10 Å/s		Not measured	Not measured
Batch size	Up to 1x4" wafers smaller pieces	24x2" wafers or 6x4" wafers or 6x6" wafers	Pieces or 1x4" wafer or 1x6" wafer	1x4" wafer Several smaller samples	1 large sample (< 4" wafer) Several smaller samples
Allowed materials	Silicon oxide Silicon (oxy)nitride Photoresist PMMA Mylar SU-8 Metals	Silicon oxide Silicon (oxy)nitride Photoresist PMMA Mylar SU-8 Metals	Silicon Silicon oxide Silicon nitride Silicon (oxy)nitride Photoresist PMMA Mylar SU-8 Metals Carbon	.	.
Comment	For thicknesses above 200 nm permission is required An adhesion layer (of Cr or Ti) is recommended under Au.	For thicknesses above 200 nm permission is required An adhesion layer (of Cr or Ti) is recommended under Au.		Used to gold sputter coating of samples mainly before SEM characterization	Used to gold sputter coating of samples mainly before SEM characterization

* For thicknesses above 200 nm permission from ThinFilm group (thinfilm@danchip.dtu.dk) is required.

Adhesion of Au on Si

Roughness of Au layers - Roughness of Au layers deposited with different equipment and settings