Heating configuration for use in thermal processing chambers
View Patent ↗An apparatus for heat treating semiconductor wafers is disclosed. The apparatus includes a heating device which contains an assembly linear lamps for emitting light energy onto a wafer. The linear lamps can be placed in various configurations. In accordance with the present invention, tuning devices which are used to adjust the overall irradiance distribution of the light energy sources are included in the heating device. The tuning devices can be, for instance, are lamps or lasers.
1. A process for heating semiconductor substrates comprising:
placing a semiconductor substrate in a processing chamber;
heating the semiconductor substrate with a first heating device; and
in addition to the first heating device, directing a plurality of laser beams onto the semiconductor substrate, the laser beams emitting light energy at more than one wavelength, and wherein at least one of the laser beams comprises p-polarized light.
2. A process as defined in claim 1 , further comprising the step of rotating the semiconductor substrate while the substrate is being heated.
3. A process as defined in claim 1 , wherein at least one of the laser beams contacts the semiconductor substrate at an angle of incidence of from about 40° to about 85°.
4. A process as defined in claim 1 , wherein each of the laser beams contact the semiconductor substrate at an angle of incidence of from about 40° to about 85°.
5. A process as defined in claim 1 , wherein at least one of the laser beams is scanned across a surface of the semiconductor substrate.
6. A process as defined in claim 1 , further comprising the step of sensing the temperature of the semiconductor substrate as the substrate is being heated; and
based upon the sensed temperature, controlling the amount of heat being emitted by the first heating device.
7. A process as defined in claim 6 , wherein the intensity of the laser beams is controlled independently of the amount of heat being emitted by the first heating device.
8. A process as defined in claim 1 , wherein the first heating device comprises a plurality of light energy sources that are parallel with respect to the semiconductor substrate.
9. A process for heating semiconductor substrates comprising:
placing a semiconductor substrate in a processing chamber;
heating the semiconductor substrate with a first heating device; and
in addition to the first heating device, directing a plurality of laser beams onto the semiconductor substrate, the laser beams emitting light energy at more than one wavelength, at least one of the laser beams comprising p-polarized light and at least one of the laser beams contacting the semiconductor substrate at an angle of incidence of from about 40° to about 85°.
10. A process as defined in claim 9 , wherein at least one of the laser beams is scanned across a surface of the semiconductor substrate.
11. A process as defined in claim 9 , further comprising the step of sensing the temperature of the semiconductor substrate as the substrate is being heated; and
based upon the sensed temperature, controlling the amount of heat being emitted by the first heating device.
12. A process as defined in claim 10 , further comprising the step of sensing the temperature of the semiconductor substrate as the substrate is being heated; and
based upon the sensed temperature, controlling the amount of heat being emitted by the first heating device.
13. A process for heating semiconductor substrates comprising:
placing a semiconductor substrate in a processing chamber;
heating the semiconductor substrate with a first heating device; and
in addition to the first heating device, directing a plurality of laser beams onto the semiconductor substrate the laser beams emitting light energy at more than one wavelength, at least one of the laser beams contacting the semiconductor substrate at an angle of incidence of from about 40° to about 85° and at least one of the laser beams also being scanned across a surface of the semiconductor substrate.
14. A process for heating semiconductor substrates comprising:
placing a semiconductor substrate in a processing chamber;
heating the semiconductor substrate with a first heating device; and
in addition to the first heating device, directing a plurality of laser beams onto the semiconductor substrate, the laser beams emitting light energy at more than one wavelength, at least one of the laser beams comprising p-polarized light, and at least one of the laser beams being scanned across a surface of the semiconductor substrate.
15. A process as defined in claim 14 , wherein all of the laser beams are scanned across a surface of the semiconductor substrate.
16. A process for heating semiconductor substrates comprising:
placing a semiconductor substrate in a processing chamber;
heating the semiconductor substrate with a first heating device;
in addition to the first heating device, directing a plurality of laser beams onto the semiconductor substrate, the laser beams emitting light energy at more than one wavelength, at least one of the laser beams being scanned across a surface of the semiconductor substrate;
sensing the temperature of the semiconductor substrate as the substrate is being heated; and
based upon the sensed temperature, controlling the amount of heat being emitted by the first heating device, and wherein the intensity of the laser beams is controlled independently of the amount of heat being emitted by the first heating device.
17. A process as defined in claim 16 , wherein the intensity of the laser beams is controlled independently of the amount of heat being emitted by the first heating device.
18. A process for heating semiconductor substrates comprising the steps of:
placing a semiconductor substrate in a processing chamber;
heating the semiconductor substrate with a first heating device;
heating the semiconductor substrate with light energy being emitted by a second heating device, the second heating device comprising a plurality of tuning devices, the tuning devices comprising arc lamps, the tuning devices emitting light energy in a pulsed mode and wherein at least certain of the tuning devices emit light energy that contacts the semiconductor substrate at an angle of incidence of from about 40° to about 85°; and
controlling the second heating device independently of the first heating device using a controller, the controller comprising a microprocessor.
19. A process as defined in claim 18 , further comprising the step of scanning the tuning devices over a surface of the semiconductor substrate.
20. A process as defined in claim 18 , wherein the controller controls the second heating device by controlling the frequency of pulses being emitted by the tuning devices.