Carbon cell

Details

  • Enable to obtain holes concentration from 1018 to 1020 cm-3 in GaAs
  • Compatible with existing solid sources MBE systems
  • Up to 2100°C operating Temperature range with long lifetime
  • Excellent Uniformity
  • Rapid flux variation
  • Simplicity of operation
  • Easy exchange of PG filament

Presentation

The carbon sublimation doping cell is used for carbon doping. The flux of carbon is generated by sublimating a high purity Pyrolithic Graphite filament. The Pyrolithic Graphite filament is heated up by direct flow of high intensity current. The region surrounding the filament is made out of the same PG material to guarantee the high purity of the carbon flux.

In normal operation, the filament is heated up in the range of temperature 1700°C-2100°C. The low thermal mass of the filament permits to change rapidly the doping levels. The filament emission area gives an excellent lateral uniformity for 2” and 3” substrates. The Filament surrounding is built in high purity Pyrolithic graphite to prevent any cross contamination due to outgassing.

The source can be customized in order to fit on a large variety of vacuum systems. Electrical feedthroughs are water cooled in order to stand the current density applied to the source.

Layout

RIBER - Carbon Cell - layout

Technical information

Cell characteristics Carbon cell
Filament Single high purity carbon (PG)
Capacity 800h @ 0,5Å/min // 10E19 cm-3
Mounting flange CF 40
Water-cooled feedthroughs Yes
Water flow 2-7 bar / 0,3 L/min
Thermocouple C-type
Typical operating temperature 1900°C (~72 A) – 2100°C (~80 A)
Maximum outgassing temperature 2300 °C (~100A)
Power consumption 1500 W

Component interfacing

RIBER - Carbon Cell - interfacing

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