Patent ID: 11885750
Assignee: LAM RESEARCH CORPORATION
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 13:
14. A method of measuring a water bow of a wafer in a wafer processing stream that includes a wafer processing module, the method comprising:
integrating a wafer bow measurement system with the wafer processing module, the wafer measurement system comprising:
a wafer support assembly to impart rotational movement to a measured wafer supported in the measurement unit;
an optical sensor;
a calibration standard to calibrate the optical sensor;
a linear stage actuator to impart linear direction of movement to the optical sensor;
a wafer centering sensor to determine a centering of the measured wafer supported in the measurement unit; and
a wafer alignment sensor to determine an alignment of the measured wafer supported in the measurement unit;

extracting a wafer from the wafer processing stream for wafer bow measurement by the wafer bow measurement system;
adjusting a parameter of the wafer processing stream based on a water bow measurement derived by the wafer bow measurement system; and
placing the measured wafer back into the wafer processing stream.