System for coupling a voltage to spatially segmented portions of the wafer with variable voltage
The present disclosure generally relates to plasma assisted or plasma enhanced processing chambers. More specifically, embodiments herein relate to electrostatic chucking (ESC) substrate supports configured to provide independent pulses of direct-current (“DC”) voltage through a switching system to electrodes disposed in the ESC substrate support. In some embodiments, the switching system can independently alter the frequency and duty cycle of the pulsed DC voltage that is coupled to each electrode. In some embodiments, during processing of the substrate, the process rate, such as etch rate or deposition rate, can be controlled independently in regions of the substrate because the process rate is a function of the frequency and duty cycle of the pulsed DC voltage. The processing uniformity of the process performed on the substrate is improved.
1. A substrate support assembly, comprising:
a substrate support having a substrate support surface;
a plurality of electrodes extending through the substrate support and extending above the substrate support surface;
a pair of switches, wherein each electrode of the plurality of electrodes is electrically connected to the pair of switches;
at least one trim voltage source electrically and physically connected between the pair of switches and at least one of the plurality of electrodes; and
a chucking electrode planarly embedded in the substrate support.
2. The substrate support assembly of claim 1 , wherein the plurality of electrodes is a plurality of conductive pins.
3. The substrate support assembly of claim 1 , wherein an electrode of the plurality of electrodes comprises aluminum, an aluminum alloy, silicon carbide, or combinations thereof.
4. The substrate support assembly of claim 1 , wherein each switch of the pair of switches is a fast high-voltage transistor switch.
5. The substrate support assembly of claim 1 , wherein at least a portion of the plurality of electrodes is arranged in a circular pattern.
6. The substrate support assembly of claim 1 , further comprising a first voltage source connected to one switch of the pair of switches and a second voltage source connected to the other switch of the pair of switches.
7. The substrate support assembly of claim 6 , wherein the first voltage source and the second voltage source have opposite polarity.
8. A substrate support assembly, comprising:
a substrate support;
a plurality of bias electrodes embedded in the substrate support;
a pair of switches, wherein each bias electrode of the plurality of bias electrodes is electrically connected to the pair of switches;
at least one trim voltage source electrically and physically connected between the pair of switches and at least one of the bias electrodes of the plurality bias of electrodes; and
a chucking electrode planarly embedded in the substrate support.
9. The substrate support assembly of claim 8 , wherein each switch of the pair of switches is a fast high-voltage transistor switch.
10. The substrate support assembly of claim 8 , wherein the plurality of bias electrodes comprises two to 20 bias electrodes.
11. The substrate support assembly of claim 8 , wherein the plurality of bias electrodes comprises a circular plate and one or more discontinuous annuluses that are concentric with the circular plate.
12. The substrate support assembly of claim 8 , wherein the plurality of bias electrodes is arranged in a spoke pattern, grid pattern, line pattern, spiral pattern, interdigitated pattern, random pattern, or combinations thereof.
13. The substrate support assembly of claim 8 , wherein each bias electrode is isolated from every other bias electrode.
14. The substrate support assembly of claim 8 , further comprising a first voltage source connected to one switch of the pair of switches and a second voltage source connected to the other switch of the pair of switches.
15. The substrate support assembly of claim 14 , wherein the first voltage source and the second voltage source have opposite polarity.
16. A processing chamber, comprising:
a chamber lid;
one or more sidewalls;
a chamber bottom, wherein the chamber lid, the one or more sidewalls, and the chamber bottom define a processing volume; and
a substrate support assembly disposed in the processing volume, the substrate support assembly comprising;
a cooling base;
a substrate support coupled to the cooling base;
a chucking electrode planarly embedded in the substrate support;
a plurality of bias electrodes embedded in the substrate support;
a pair of switches, wherein at least one bias electrode of the plurality of bias electrodes is electrically connected to the pair of switches; and
at least one trim voltage source electrically and physically connected between the pair of switches and at least one of the bias electrodes.
17. The processing chamber of claim 16 , wherein the plurality of bias electrodes is arranged in a spoke pattern, grid pattern, line pattern, spiral pattern, interdigitated pattern, random pattern, or combinations thereof.
18. The processing chamber of claim 16 , wherein each bias electrode is isolated from every other bias electrode.
19. The processing chamber of claim 16 , further comprising a first voltage source connected to one switch of the pair of switches and a second voltage source connected to the other switch of the pair of switches.
20. The processing chamber of claim 19 , wherein the first voltage source and the second voltage source have opposite polarity.