VESCO-NM’s corrosive materials valved cracker is used in MBE growth to crack reactive materials with high-vapor pressure such as Sb, Zn, Se, Cd, CdTe, Te, and Mg. In this source, crucible and cracking tube and valve assembly are ALL manufactured from PBN to avoid any corrosion. The source has ONLY two integrated heaters for bulk and cracking zones, without heat separation or gap, to avoid materials condensation and to reduce the cost by using less power supplies and temperature controllers. An easy materials loading process is achieved using either the removable valve assembly or through the loading flange. The PBN valve assembly is designed to achieve fast flux stabilization, excellent uniformity across substrate, as well as quick and complete shut-off to minimize materials wasting. The valve can be controlled by other vendors’ Automated Valve Positioners. Valve travel distance limits are secured by internal mechanisms to avoid any possible adjustment-related damages or stress on the PBN parts.
