Heating apparatus with enhanced thermal uniformity and method for making thereof
View Patent ↗A heating apparatus for regulating/controlling the surface temperature of a substrate is provided. At least a thermal pyrolytic graphite (TPG) layer is embedded in the heater to diffuse the temperature difference of the various components in the heating apparatus and provide temporal and spatial control of the surface temperature of the substrate, for a relatively uniform substrate temperature with the difference between the maximum and minimum temperature points on the substrate of less than 10° C.
1. An apparatus for supporting a substrate in a process chamber and regulating the surface temperature of the substrate, the apparatus comprising:
a base support having a surface adapted to support the substrate;
a heating element for heating the substrate to a temperature of at least 300° C.;
at least one layer of thermal pyrolytic graphite material embedded in the base support, the thermal pyrolytic graphite (TPG) layer having a thermal conductivity of at least 1000 W/m° C. in a plane parallel to the substrate being supported;
wherein the surface of the base support has a maximum temperature variation of 10° C. between a lowest point and a highest temperature point on the surface of the base support;
and further wherein,
the base support for supporting the wafer comprises a base substrate comprising at least one of copper, aluminum, and alloys thereof;
the at least a layer of thermal pyrolytic graphite is embedded in the metal base substrate;
the heating element for heating the substrate to a temperature of at least 300° C. is embedded in the metal base substrate, under the thermal pyrolytic graphite layer and away from the wafer substrate.
2. An apparatus for supporting a substrate in a process chamber and regulating the surface temperature of the substrate, the apparatus comprising:
a base support having a surface adapted to support the substrate;
a heating element for heating the substrate to a temperature of at least 300° C.;
at least one layer of thermal pyrolytic graphite material embedded in the base support, the thermal pyrolytic graphite (TPG) layer having a thermal conductivity of at least 1000 W/m° C. in a plane parallel to the substrate being supported;
wherein the surface of the base support has a maximum temperature variation of 10° C. between a lowest point and a highest temperature point on the surface of the base support, and further wherein
the base support for supporting the wafer substrate comprises a base substrate comprising at least one of copper, aluminum, and alloys thereof;
the heating element is sandwiched between two dielectric layers for heating the substrate to a temperature of at least 300° C. and disposed on the metal base substrate,
the at least a layer of thermal pyrolytic graphite is embedded in the metal base substrate, under the heating element and dielectric layers, and away from the wafer substrate.