Oxford Applied Research

Although it has been known for many years that the thermal decomposition of GaP´and GaAs produces substantially P2 and As2 respectively, only recently has this method been seriously applied in MBE as a simpler, lower-cost alternative to two-zone valved crackers which operate with elemental red phosphorus (P4) feedstock. On heating, red phosphorus sublimes and converts to the white P4 allotrope, which must then be thermally cracked from a secondary buffer zone to produce the reactive P2 species. In contrast, the CDK35 is a compound dissociation source consisting solely of a K-cell and a Ga trap.