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Using evaporators

Knudsen-cell evaporators

We have several simple home-made Knudsen-cell evaporators. They have no shutters and no water cooling. They can be used only in the preparation chamber - bottom.

The cell consists of a crucible made of alumina ceramic tube with a tantalum heating spiral wound around it. The backside of the ceramic tube is closed with a piece of aluminum foil into which the K-type thermocouple for temperature reading is inserted. Temperatures up to 300 °C can be reached.

For the operation we use the PS2342-06B DC power supply (up to 42 V/6 A); the currents up to 3 A are sufficient. The thermocouple voltage is read on a multimeter and recalculated to temperature using a table..

The deposition is timed by rotating and/or translating the sample holder attached to the transfer rod. The evaporator is to be preheated sufficiently in advance, in order to provide constant deposition rate. The rate can be checked by quartz crystal microbalance and adjusted by the heating current while observing the crucible temperature.

After use the crucibles should be properly cleaned (in supersonic bath, solvents, furnace...) and degassed by annealing in vacuum in order to avoid cross-contamination of the following material to be evaporated.

Last Updated on Thursday, 12 September 2019 11:12