Patent ID: 6596339
Filing Date: 2003-07-22
Classification: C23C

Abstract:
A method of non-contact, in-situ temperature measurement of a substrate during chemical vapor deposition of a material on the substrate in a reactor vessel, the method comprising:directing at the deposited material magnitude modulated UV light having a plurality of separated spectral components with wavelengths corresponding to different temperature dependencies of absorptance in the deposited material, the separated spectral components being within transparency spectral windows of a plasma media contained in the reactor vessel; directing a portion of the magnitude modulated UV light to a comparison device as reference light; directing light reflected from the deposited material to the comparison device; utilizing the comparison device to compare the magnitude modulated components of the reflected light and the magnitude modulated components of the reference light to determine a temperature of the deposited material; and utilizing the determined temperature to control the temperature of the substrate.