Patent ID: 8992686
Filing Date: 2015-03-31
Classification: C23C,H01L

Abstract:
1. A mounting table structure for use in forming a thin film on a surface of a target object mounted on the mounting table structure by using a raw material gas including an organic metal compound in a vacuum evacuable processing chamber, the mounting table structure comprising: a mounting table main body which mounts thereon the target object and has therein a heater; a plurality of thermal insulators; and a base which supports the mounting table main body via the thermal insulators while surrounding a side surface and a bottom surface of the mounting table main body, the base having therein a coolant path where a coolant flows therethrough, wherein the base is configured to be maintained at a temperature higher than a solidification temperature or a liquefaction temperature of the raw material gas, but lower than a decomposition temperature of the raw material gas, wherein the base includes: a circular plate-shaped base portion, made of a metal, which has therein the coolant path and supports the mounting table main body via the thermal insulators provided between a top surface of the base portion and the bottom surface of the mounting table main body; and an edge ring, made of a metal, which stands upright on a peripheral edge of the base portion so as to surround the side surface of the mounting table main body and is coupled to the base portion as one unit, wherein a thermal conduction buffer member is provided between the base portion and the edge ring, the thermal conduction buffer member being made of a metal having a thermal conductivity lower than a thermal conductivity of the metal forming the edge ring, wherein a space exists between an inner peripheral surface of the edge ring and the side surface of the mounting table main body, wherein a shield ring is detachably provided between the side surface of the mounting table main body and the inner peripheral surface of the edge ring, wherein a plurality of spaces exists between the thermal insulators, and wherein each of the thermal insulators has a support protrusion at an upper portion thereof and leg portions at a lower portion thereof, the support protrusion being in contact with the bottom surface of the mounting table main body and the leg portions being in contact with the top surface of the base portion.