Thin-film deposition methods with thermal management of evaporation sources
In various embodiments, evaporation sources for deposition processes have disposed therearound an insulation material configurable to fit snugly around the source body of the evaporation source and to be at least partially distanced away from the source body to expedite heat transfer therefrom.
1. A method of thin-film deposition, the method comprising:
providing within a deposition chamber an evaporation source comprising (i) a source body containing a feedstock material, and (ii) an evaporation port fluidly coupling the source body with an interior of the deposition chamber;
disposing an insulation material around the evaporation source to reduce heat loss therefrom;
establishing a processing ambient within the deposition chamber by at least one of (i) evacuating at least a portion of gas disposed within the deposition chamber, thereby establishing a vacuum ambient therein, or (ii) introducing a process gas within the deposition chamber;
heating the evaporation source with the insulation material disposed around the evaporation source in a first position, whereby at least a portion of the feedstock material vaporizes, exits the source body through the evaporation port, and is deposited on a substrate within the deposition chamber, thereby forming at least a portion of a thin film;
after the at least a portion of the thin film is formed, and within the processing ambient, moving at least a portion of the insulation material away from the evaporation source to a second position during cooling of the evaporation source, thereby enhancing heat loss therefrom; and
while remaining in the processing ambient and after a temperature of the evaporation source has decreased by a desired amount, disposing the at least a portion of the insulation material proximate the evaporation source in the first position to reduce heat loss from the evaporation source.
2. The method of claim 1 , wherein (i) the process gas is introduced within the deposition chamber, and (ii) the process gas reacts with the vaporized feedstock material.
3. The method of claim 1 , wherein (i) the insulation material comprises a plurality of discrete segments, and (ii) moving at least a portion of the insulation material away from the evaporation source comprises moving one or more of the segments away from the evaporation source.
4. The method of claim 3 , wherein one or more segments of the insulation material remain disposed proximate the evaporation source when one or more other segments of the insulation material are moved away from the evaporation source.
5. The method of claim 1 , wherein moving at least a portion of the insulation material away from the evaporation source comprises establishing a line of sight between at least a portion of the source body and an interior wall of the deposition chamber, the interior wall having a temperature lower than a temperature of the evaporation source.
6. The method of claim 1 , wherein the insulation material comprises at least one of carbon or a ceramic material.
7. The method of claim 1 , wherein the insulation material comprises at least one of graphite, carbon fiber, mullite, alumina, silica, or zirconia.
8. The method of claim 1 , wherein the insulation material comprises at least one of tantalum, niobium, or molybdenum.
9. The method of claim 1 , wherein the insulation material comprises a felt, a foam, a sol gel material, or a plurality of spaced-apart solid shields.
10. The method of claim 1 , wherein moving at least a portion of the insulation material away from the evaporation source comprises opening the insulation material at one or more hinged points.
11. The method of claim 1 , wherein, in both the first and second positions, the insulating material is disposed between the source body and a heat source that heats the evaporation source.
12. A method of thin-film deposition, the method comprising:
providing within a deposition chamber an evaporation source comprising (i) a source body containing a feedstock material, and (ii) an evaporation port fluidly coupling the source body with an interior of the deposition chamber;
insulating the evaporation source to reduce heat loss therefrom;
establishing a processing ambient within the deposition chamber by at least one of (i) evacuating at least a portion of gas disposed within the deposition chamber, thereby establishing a vacuum ambient therein, or (ii) introducing a process gas within the deposition chamber;
while the evaporation source is insulated, heating the evaporation source, whereby at least a portion of the feedstock material vaporizes, exits the source body through the evaporation port, and is deposited on a substrate within the deposition chamber, thereby forming at least a portion of a thin film;
after the at least a portion of the thin film is formed, and within the processing ambient, reducing the insulation of the evaporation source during cooling of the evaporation source, thereby enhancing heat loss therefrom; and
while remaining in the processing ambient and after a temperature of the evaporation source has decreased by a desired amount, increasing the insulation of the evaporation source to reduce heat loss therefrom.
13. The method of claim 12 , wherein (i) the process gas is introduced within the deposition chamber, and (ii) the process gas reacts with the vaporized feedstock material.
14. The method of claim 12 , wherein (i) insulating the evaporation source comprises disposing a plurality of discrete segments of insulation material around the evaporation source, and (ii) reducing the insulation of the evaporation source comprises moving one or more of the segments away from the evaporation source.
15. The method of claim 14 , wherein one or more segments of the insulation material remain disposed proximate the evaporation source when one or more other segments of the insulation material are moved away from the evaporation source.
16. The method of claim 14 , wherein moving one or more of the segments away from the evaporation source comprises opening the insulation material at one or more hinged points.
17. The method of claim 12 , wherein reducing the insulation of the evaporation source comprises establishing a line of sight between at least a portion of the source body and an interior wall of the deposition chamber, the interior wall having a temperature lower than a temperature of the evaporation source.
18. The method of claim 12 , wherein insulating the evaporation source comprises disposing an insulation material around the evaporation source.
19. The method of claim 18 , wherein the insulation material comprises at least one of carbon or a ceramic material.
20. The method of claim 18 , wherein the insulation material comprises at least one of graphite, carbon fiber, mullite, alumina, silica, or zirconia.
21. The method of claim 18 , wherein the insulation material comprises at least one of tantalum, niobium, or molybdenum.
22. The method of claim 18 , wherein the insulation material comprises a felt, a foam, a sol gel material, or a plurality of spaced-apart solid shields.
23. The method of claim 18 , wherein the insulating material is disposed between the source body and a heat source that heats the evaporation source.