Patent ID: 11920242
Assignee: TOKYO ELECTRON LIMITED
Field: Surface technology, coating (Chemistry)
Classification: CPC C  H | IPC C  H

Claim 0:
1. A temperature control method, comprising:
switching a heat medium to be supplied into a flow path provided inside a placing table from a heat medium of a first temperature to a heat medium of a second temperature, the placing table being disposed inside a processing vessel of a plasma processing apparatus and configured to place a substrate thereon, the heat medium of the first temperature being supplied from a first temperature controller when an etching processing is performed on the substrate, the heat medium of the second temperature being supplied from a second temperature controller when a cleaning process configured to remove a reaction product adhering to an electrostatic chuck provided on the placing table is performed after the substrate is carried out of the processing vessel;
after the switching, igniting plasma by starting to supply a cleaning gas into the processing vessel;
calculating a slope of temperature change of the heat medium based on a temperature of the heat medium at an outlet side of the flow path;
controlling the second temperature controller until the temperature of the heat medium at the outlet side of the flow path is stabilized to a third temperature lower than a predetermined set value; and
controlling the second temperature controller in order for the temperature of the heat medium at the outlet side of the flow path to reach the set value,
wherein the first temperature is in a range of about −40° C. to about −80° C., and
the set value is lower than a vaporization temperature of the heat medium.