Patent ID: 6641302
Filing Date: 2003-11-04
Classification: G01J

Abstract:
A thermal process apparatus for a semiconductor substrate, comprising:a heating source heating the semiconductor substrate by irradiating a light on one surface of the semiconductor substrate; a reflection plate facing an opposite surface of the semiconductor substrate in a state where a reflection cavity is formed with the opposite surface of the semiconductor substrate; a thermometer having a light-receiving part provided in the reflection plate so as to measure a temperature of the semiconductor substrate by catching a radiation beam from the semiconductor substrate heated by the heating source; and a light absorbing structure provided around the light-receiving part configured to absorb a diffuse reflection light generated in the reflection cavity, wherein the light absorbing structure comprises a concave part forming a black body, and the concave part has an opening width whose value is greater than 2D*tan &thgr;, where &thgr; is defined as a value of a critical angle of the light receiving part, sin &thgr; is defined as a numerical aperture in a vacuum when the light-receiving part catches the light, and D is defined as a distance between the reflection plate and the semiconductor substrate.