Patent ID: 11866822
Assignee: KOKUSAI ELECTRIC CORPORATION
Field: Semiconductors (Electrical engineering)
Classification: CPC C  H | IPC C  H

Claim 13:
14. A method of manufacturing a semiconductor device, comprising:
processing a substrate in a process chamber;
vaporizing, by using a vaporizer, a liquid precursor by controlling a first heater based on a temperature measured by a first temperature sensor and controlling a second heater based on a temperature measured by a second temperature sensor, the vaporizer including:
a precursor vessel in which the liquid precursor is stored;
the first heater immersed in the liquid precursor stored in the precursor vessel and configured to heat the liquid precursor;
the second heater configured to heat the precursor vessel;
the first temperature sensor immersed in the liquid precursor stored in the precursor vessel and configured to measure the temperature of the liquid precursor;
the second temperature sensor immersed in the liquid precursor stored in the precursor vessel and configured to measure the temperature of the liquid precursor; and
a liquid surface detection sensor configured to detect a height of a liquid surface of the liquid precursor in the precursor vessel;
cleaning an interior of the process chamber by supplying a gas obtained by vaporizing the liquid precursor into the process chamber; and
stopping heating by the first heater and the second heater, when a position of the liquid surface detected by the liquid surface detection sensor is lower than a predetermined liquid surface range set above the first temperature sensor.