High definition heater and method of operation
A heater system is provided that includes a base functional layer having at least one functional zone. A substrate is secured to the functional member, and a tuning layer is secured to the substrate opposite the base functional layer. The tuning layer includes a plurality of zones that is greater in number than the zones of the base functional layer, and the tuning layer provides lower power than the base functional layer. A component is secured to the tuning layer opposite the substrate, and the substrate defines a thermal conductivity to absorb and dissipate a requisite amount of power from the base functional layer. A control system is also provided that has a plurality of addressable control elements in electrical communication with power lines and with the tuning layer, the control elements providing selective control of the tuning layer zones.
1. A heater system comprising:
a base functional layer comprising at least one functional zone;
a substrate secured to the base functional layer;
a tuning layer secured to the substrate opposite the base functional layer, the tuning layer comprising a plurality of zones that is greater in number than the zones of the base functional layer, and the tuning layer having lower power than the base functional layer;
a component secured to the tuning layer opposite the substrate,
wherein the substrate distributes and transfers heat from the base functional layer; and
a control system having:
a plurality of sets of power lines in communication with the tuning layer, wherein each of the power lines are operable to apply a power supply and a return; and
a plurality of addressable control elements in electrical communication with the power lines and with the tuning layer, the control elements providing selective control of the zones of the tuning layer,
wherein the base functional layer is a thermal layer for providing heating or cooling to the component, wherein the tuning layer adjusts a heating profile applied by the base functional layer to the component by compensating for any heat loss or thermal variations in the component.
2. The heater system according to claim 1 , wherein the control elements are threshold voltage switching circuits.
3. The heater system according to claim 2 , wherein the threshold voltage switching circuits comprise semiconductor switches.
4. The heater system according to claim 2 , wherein the threshold voltage switching circuits are packaged.
5. The heater system according to claim 4 , wherein the packaging is an ASIC (Application Specific Integrated Circuit).
6. The heater system according to claim 1 , wherein the control elements are embedded within the component.
7. The heater system according to claim 1 , wherein at least one of the base functional layer and the tuning layer are heaters.
8. The heater system according to claim 1 , wherein at least one of the base functional layer and the tuning layer are temperature sensors.
9. The heater system according to claim 1 , wherein at least one of the base functional layer and the tuning layer comprise a resistive material with sufficient TCR characteristics such that the at least one base functional layer and the tuning layer function as both a heater and as a temperature sensor.
10. The heater system according to claim 1 , wherein at least one of the base functional layer and the tuning layer are heaters and define a layered construction.
11. The heater system according to claim 1 , wherein at least one of the base functional layer and the tuning layer are heaters and define a polyimide heater.
12. The heater system according to claim 1 further comprising a plurality of heat spreaders disposed proximate each of the zones of the tuning layer.
13. The heater system according to claim 12 , wherein the heat spreaders are a material selected from the group consisting of Aluminum, Copper, Pyrolytic Graphite, and Aluminum Nitride.
14. The heater system according to claim 1 , wherein the component is selected from the group consisting of a chuck, a pedestal, a wafer table, a substrate support, and a showerhead.
15. The heater system according to claim 1 , wherein at least one of the base functional layer and the tuning layer has a CTE that is matched with a CTE of the substrate.
16. The heater system according to claim 1 furthering comprising a routing layer disposed between the base functional layer and the tuning layer and defining an internal cavity for routing of the power lines.
17. The heater system according to claim 1 , wherein the base functional layer is bonded to a base plate opposite the substrate.
18. The heater system according to claim 1 , wherein the control elements communicate across a digital bus.
19. The heater system according to claim 1 further comprising a multiplexer in communication with each of the control elements.
20. The heater system according to claim 19 , wherein the multiplexer communicates with a power supply through an optical bus.