Substrate lift mechanism and reactor including same
A substrate support assembly suitable for use in a reactor including a common processing and substrate transfer region is disclosed. The substrate support assembly includes a susceptor and one or more lift pins that can be used to lower a substrate onto a surface of the susceptor and raise the substrate from the surface, to allow transfer of the substrate from the processing region, without raising or lowering the susceptor.
1. A reactor comprising a common substrate processing and transfer region, the reactor comprising:
a reaction chamber comprising a reaction region; a susceptor having a susceptor top surface within the reaction region;
a substrate lift mechanism comprising:
at least one lift pin;
a lift pin support member that removably engages to the at least one pin;
and a movable shaft coupled to the lift pin support member, a rotatable shaft; and
a susceptor support comprising one or more susceptor support arms and one or more susceptor support structures, the susceptor support coupled to the rotatable shaft,
wherein the substrate lift mechanism causes the at least one lift pin to extend through a width of the susceptor and above the susceptor top surface,
wherein the one or more susceptor support arms comprise an aperture to receive the at least one lift pin at a location radially exterior to a susceptor support structure of the one or more susceptor support structures,
wherein the one or more susceptor support structures engage with the susceptor, and
wherein the susceptor retains the at least one lift pin when the at least one lift pin is not engaged by the lift pin support member.
2. The reactor of claim 1 , wherein the moveable shaft traverses a distance of about 5 mm to about 25 mm during a substrate transfer process.
3. The reactor of claim 1 , wherein a length of the at least one lift pin ranges from about 20 mm to about 40 mm.
4. The reactor of claim 1 , wherein the at least one lift pin comprises a lift pin top surface, and wherein the substrate lift mechanism causes the lift pin top surface to extend from below the susceptor top surface to a distance up to about 22 mm above the susceptor top surface.
5. The reactor of claim 1 , wherein the susceptor comprises a center region and a peripheral region and wherein a width of the center region is greater than a width of the peripheral region.
6. The reactor of claim 5 , wherein the width of the peripheral region ranges from about 3 mm to about 6.5 mm.
7. The reactor of claim 5 , wherein the width of the center region ranges from about 6 mm to about 10 mm.
8. The reactor of claim 5 , wherein the reactor further comprises at least one thermocouple having an end, the thermocouple extending through the moveable shaft, and the end received within an opening in the center region.
9. The reactor of claim 1 , wherein the susceptor comprises graphite coated with silicon carbide.
10. The reactor of claim 1 , wherein the susceptor is coupled to the susceptor support, such that a rotational movement of the rotatable shaft is translated to the susceptor.
11. The reactor of claim 10 , wherein the susceptor support comprises a plurality of support structures.
12. The reactor of claim 11 , wherein the plurality of susceptor support structures comprise SiC, SiC-coated graphite, or quartz.
13. A substrate support assembly comprising:
a susceptor;
a susceptor support coupled to the susceptor;
a rotatable shaft coupled to the susceptor support;
a lift pin support member;
one or more lift pins coupled to the lift pin support member;
a moveable shaft coupled to the lift pin support member;
a lift pin mechanism to cause the moveable shaft to move in a vertical direction during a substrate transfer process; and
a susceptor rotation mechanism that causes the susceptor to rotate during substrate processing,
wherein the susceptor support comprises a plurality of susceptor support arms and one or more susceptor support structures coupled to or integrated with each of the plurality of support arms,
wherein the susceptor does not move in a vertical direction during substrate transfer, and
wherein the susceptor retains the at least one lift pin at a location radially exterior to a susceptor support structure of the one or more susceptor support structures when the at least one lift pin is not engaged by the lift pin support member.
14. The substrate support assembly of claim 13 , wherein at least one of the plurality of susceptor support arms comprises an aperture to receive a lift pin at a location radially exterior to the susceptor support structure.
15. The substrate support assembly of claim 13 , wherein the susceptor comprises a center region and a peripheral region and wherein a width of the center region is greater than a width of the peripheral region.
16. The substrate support assembly of claim 15 , further comprising at least one thermocouple having an end, the thermocouple extending through the moveable shaft, and the end received within an opening in the center region.