Pyrometer calibrated wafer temperature estimator

Details Pyrometer calibrated wafer temperature estimator Pyrometer calibrated wafer temperature estimator

2005-08-02

2005-08-02

Fuqua, Shawntina (Department: 3742)

Electric heating

Heating devices

Combined with container, enclosure, or support for material...

C219S405000, C219S411000, C392S416000, C392S418000, C118S724000, C118S725000, C118S050100

Reexamination Certificate

active

06924463

ABSTRACT:
A wafer temperature estimator calibrates contact-type temperature sensor measurements that are used by a temperature controller to control substrate temperature in a high temperature processing chamber. Wafer temperature estimator parameters provide an estimated wafer temperature from contact-type temperature sensor measurements. The estimator parameters are refined using non-contact-type temperature sensor measurements during periods when the substrate temperature is decreasing or the heaters are off. A corresponding temperature control system includes a heater, a contact-type temperature sensor in close proximity to the substrate, and an optical pyrometer placed to read temperature directly from the substrate. A wafer temperature estimator uses the estimator parameters and measurements from the contact-type sensor to determine an estimated wafer temperature. A temperature controller reads the estimated wafer temperature and makes changes to the heater power accordingly. The wafer temperature estimator has a nonlinear neural network system that is trained using inputs from the various sensors.

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