Patent ID: 11965243
Assignee: CEEVEE TECH, LLC
Field: Surface technology, coating (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A solid precursor vapor source, comprising:
a sublimation vessel configured to contain a bed of a precursor material, wherein the sublimation vessel includes one or more thermally insulated exterior walls;
an inlet port disposed at a first side of the bed of the precursor material and configured to enable a flow of a carrier gas into the sublimation vessel;
a first temperature control device disposed proximate to the inlet port and configured to control a temperature of the carrier gas entering the sublimation vessel;
an outlet port disposed at a second side of the bed of the precursor material and configured to enabled a flow of an entrained vapor to exit the sublimation vessel, wherein the entrained vapor is generated by the carrier gas flowing through the bed of the precursor material from the first side to the second side;
a second temperature control device disposed proximate to the outlet port and configured to control a temperature of the carrier gas and the entrained vapor exiting the sublimation vessel;
a first temperature sensor disposed in the sublimation vessel proximate to the first side of the bed of the precursor material;
a second temperature sensor disposed in the sublimation vessel proximate to the second side of the bed of the precursor material;
a control computer operably coupled to the first temperature control device, the second temperature control device, the first temperature sensor and the second temperature sensor, and configured to:
compute a delta temperature value based on dividing a vapor pressure of the precursor material at a sublimation temperature by a sublimation vessel pressure value, and then multiplying by a quotient computed by dividing a heat of sublimation value of the precursor material by a specific heat at constant pressure (cp) value of the carrier gas;
control the first temperature control device based on a first temperature value sensed by the first temperature sensor; and
control the second temperature control device based on a second temperature value sensed by the second temperature sensor, such that the second temperature value is approximately a sublimation temperature of the precursor material and the first temperature value is the second temperature value plus the delta temperature value.