Specific Process Knowledge/Thin film deposition/Deposition of Chromium

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Studies of Cr deposition processes

Uniformity of Cr layers - Uniformity of Cr layers deposited with different methods and settings

Sputtering of Cr in Wordentec - Settings and deposition rates

Sputtering of Cr in Sputter system (Lesker) - Settings and deposition rates

Sputtering of Cr in Sputter-system Metal-Oxide (PC1) - Settings and deposition rates

Sputtering of Cr in Sputter-system Metal-Nitride (PC3) - Settings and deposition rates

Thermal evaporation of Cr in Thermal evaporator - Settings and deposition results

Stress in sputtered Cr films - Extremely high tensile stress in Cr films deposited at high temperature

Chromium deposition

Chromium can be deposited by e-beam evaporation, thermal evaporation, and sputter deposition. It should be noted that in e-beam evaporation, chromium does not melt but evaporates directly from the solid phase. In the chart below you can compare the different deposition equipment.

	E-beam evaporation E-beam evaporation (E-beam evaporator (Temescal) and E-beam evaporator (10-pockets))	E-beam evaporation and sputter deposition (Wordentec)	Thermal evaporation (Thermal evaporator)	Sputter deposition (Lesker sputterer)	Sputter deposition ((Sputter-system Metal-Oxide (PC1) and Sputter-system Metal-Nitride (PC3)) )
General description	E-beam deposition of Chromium	E-beam and sputter deposition of Chromium	Thermal deposition of Chromium	Sputter deposition of Chromium	Sputter deposition of Chromium
Pre-clean	Ar ion gun (only in E-beam evaporator Temescal)	RF Ar clean		RF Ar clean	RF Ar clean
Layer thickness	10Å to 1µm*	10Å to 1µm*	80 nm	at least up to 200 nm	at least up to 200 nm
Deposition rate	1 Å/s to 10 Å/s	1 Å/s to 10 Å/s (e-beam) Sputtering: Depends on process parameters. See here and process log.	1 Å/s	Depends on process parameters. At least up to 1.48 Å/s. See process log.	Depends on process parameters.
Batch size	4x6" wafers or 3x8" wafers (ask for holder) Many smaller pieces	24x2" wafers or 6x4" wafers or 6x6" wafers	4x 2" wafer or 1x 4" wafers or 1x6" wafer or Several smaller pieces In theory up to 8" wafer (or 2x4" wafer) but uniformity will be bad	1x6" wafers Smaller pieces/wafers	up to 10x4" wafers or up to 10x6" wafers or many smaller samples
Allowed materials	Almost any that does not degas. See the cross-contamination sheet.	Almost any that does not degas. See the cross-contamination sheet.	Almost any that does not degas. See the cross-contamination sheet.	Silicon wafers and almost any	Almost that does not degas - see cross contamination sheets for PC1 and PC3 Special carrier for III-V materials.
Comment	Takes approx. 20 min to pump down	Takes approx. 1 hour to pump down	Takes approx. 20 min to pump down		Takes approx. 5 min to pump down load lock and 6 min for transfer to processing chamber

* For thicknesses above 300 nm, please request permission from metal@nanolab.dtu.dk to ensure there is enough material.