Patent ID: 11948818
Assignee: APPLIED MATERIALS, INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 17:
18. A method of determining a temperature of a process chamber, suitable for use in semiconductor manufacturing, comprising:
performing a first procedure comprising:
(a) flowing a deposition gas into a process volume;
(b) setting a temperature of a substrate support within the process volume to a first temperature;
(c) depositing a silicon containing layer on a top surface of the substrate support using the deposition gas, the silicon containing layer having a first thickness and the top surface of the substrate support does not include a substrate disposed thereon;
(d) monitoring constructive interference, destructive interference, or both the constructive interference and the destructive interference of reflected radiation during depositing the silicon containing layer to determine the first thickness of the silicon containing layer using one or more pyrometers, one or more reflectometers, or both one or more pyrometers and one or more reflectometers;
(e) etching the silicon containing layer from the substrate support using an etching gas at the first temperature to a second thickness less than the first thickness; and
(f) determining a first temperature etch rate of the etching the silicon containing layer at the first temperature;

repeating each of operations (a)-(f) within the first procedure at a second temperature different from the first temperature to obtain a second temperature etch rate; and
determining a measured temperature curve from at least the first temperature etch rate and the second temperature etch rate.