Remote laser-based sample heater with sample exchange turret
A physical vapor deposition system includes a hermetic chamber with an open interior and an access port. A heating laser source is adapted to direct a heating laser beam into the open interior. A substrate holder assembly comprises a substrate platform positioned in the open interior and has a plurality of substrate securing stations and a motor for moving the platform. A target assembly retains a target within the open interior. A control system can include a processor for controlling the operation of the heating laser beam and the motor. A shielding member with an opening shields queued substrate securing stations from the physical vapor deposition vapors and allows only the substrate being heated by the heating laser beam to be contacted by the physical vapor deposition vapors. A method of performing physical vapor deposition and a substrate holder assembly also are disclosed.
1. A physical vapor deposition system, comprising:
(i) a hermetic chamber with an open interior and an access port;
(ii) a heating laser source adapted to direct a laser beam into the open interior;
(iii) a substrate holder assembly comprising a substrate platform positioned in the open interior and having a plurality of substrate securing stations, wherein the substrate securing stations comprise removable thermally conductive substrate securing plates, the substrate securing plates comprising a laser-contacting side and a substrate-securing side opposite to the laser-contacting side, the substrate being in contact with the substrate-securing side, wherein upon contact with a laser beam from the laser source the laser-contacting side will heat and will transfer heat to the substrate-securing side and the substrate, and a motor for moving the platform such that each of the substrate securing stations can be positioned to intercept the heating laser beam,
wherein the substrate platform is configured as a wheel, wherein the wheel rotates about an axis that is parallel to the laser beam, wherein the wheel has a diameter and the access port has a diameter, and the diameter of the wheel is less than the diameter of the access port, and wherein the motor drives a transmission system to rotate the wheel;
(iv) a shielding member for shielding a plurality of queued substrate securing stations from physical vapor deposition vapors, the shielding member comprising an opening for permitting a substrate secured to a substrate securing station that is aligned with the opening to be contacted by physical vapor deposition vapors;
(v) a sealing support member for sealing the access port and supporting the substrate platform, the shielding member, and the transmission system within the hermetic chamber, the sealing support member being detachable from the access port, whereby the substrate platform, the shielding member, and the transmission system can be removed from the hermetic chamber in a single step by removing the sealing support member, and wherein the sealing support member comprises a laser transmissive portion aligned with the laser beam and the opening of the shielding member for permitting the laser beam to strike a substrate securing station aligned with the heating laser transmissive portion and the opening of the shielding member;
(vi) a target assembly for retaining a target within the open interior; and
(vii) a control system comprising a processor for controlling the operation of the heating laser beam and the motor.
2. The physical vapor deposition system of claim 1 , wherein the substrate holder assembly is planar and the substrate securing stations are coplanar.
3. The physical vapor deposition system of claim 1 , further comprising
(viii) an energy source for energizing the target, the energy source comprising at least one selected from the group consisting of a pulsed or continuous wave laser; resistive heating element in boat, filament, or crucible form; cathodic arc; pulsed or continuous electron beam; RF, DC, pulsed, or ion beam sputtering; and RF or DC plasma discharge.
4. The physical vapor deposition system of claim 1 , wherein the substrate securing plates comprise a thermal break opening.
5. The physical vapor deposition system of claim 1 , wherein the substrate securing plates comprise a susceptor, a susceptor region when struck by the laser beam enhances translation of the energy of the laser beam to heat a substrate secured to the substrate securing plates.
6. The physical vapor deposition system of claim 1 , further comprising
(ix) a pyrometer for sensing the temperature of the substrate securing plates.
7. The physical vapor deposition system of claim 1 , further comprising
(x) an energy source for energizing a target held by the target assembly, whereby target material will be vaporized.
8. The physical vapor deposition system of claim 1 , further comprising
(xi) a heating laser beam tube, a motor for rotating the heating laser beam tube, and a motor for raising and lowering the heating laser beam tube.
9. The physical vapor deposition system of claim 8 , further comprising
(xii) an electron beam source and a detector.