valved phosphorus cracker

Phosphorus Valved Cracker

Best Return on Investment Phosphorus Solution

The patented Valved Cracker for Phosphorus is uniquely tailored to provide a controlled and reproducible P2 flux from a solid phosphorus charge. The multi-zone crucible is designed for in situ conversion from commercially available red phosphorus to the more reactive white phosphorus with its advantageous evaporation characteristics.

Patented design with more than 175 in the field
Compatible with high-temperature outgassing
A proven effective solid source alternative to phosphine (PH3)
Vacuum sealed crucible to optimize material quality
Veeco’s unique thermal control system features independent heaters for the red and white phosphorus zones, and an air cooling jacket on the white phosphorus reservoir. Both heaters are used for thorough source outgassing. After loading, efficient charge conversion is achieved by heating the red phosphorus zone to evaporation temperatures, while cooling the white phosphorus reservoir to promote condensation of the P4 vapor. During growth, an adjustable temperature gradient is achieved using just a single bulk heater. With the heater in the red phosphorus zone, the crucible can be heated to a red phosphorus temperature of 190°C (sufficiently low to avoid evaporation of red phosphorus during operation) and a white phosphorus temperature of 75-100°C. Air cooling reduces the temperature in the white zone to the desired operating level. This system provides excellent thermal stability, even at white zone temperatures as low as 65°C.