Patent ID: 6030458
Filing Date: 2000-02-29
Classification: C23C,C30B

Abstract:
A phosphorus effusion cell adapted to be mounted to a vacuum chamber, for providing a phosphorus vapor from solid phosphorus, comprising:a sealed compartment, said sealed compartment comprising a red phosphorus crucible which holds the solid phosphorus, a condensing crucible which is axially aligned with the red phosphorus crucible, and a connecting tube which extends between the red phosphorus crucible and the condensing crucible;a heater located adjacent the red phosphorus crucible which heats the red phosphorus crucible;a cracking tube to crack P.sub.4 phosphorus in the phosphorus vapor to P.sub.2 phosphorus;a flow tube extending from the connecting tube to the cracking tube;a valve, located within the flow tube, which controls flow of the phosphorus vapor from the sealed compartment to the cracking tube; anda vacuum jacket which encloses and supports the sealed compartment, wherein a vacuum space is defined between the vacuum jacket and the sealed compartment, the vacuum space being externally pumped so as to reduce the pressure in the vacuum space.