Nozzle-based, vapor-phase, plume delivery structure for use in production of thin-film deposition layer
View Patent ↗A vapor deposition source including a crucible configured to hold a quantity of molten constituent material and at least one nozzle to pass vapor evaporated from the molten constituent material out of the crucible.
1. A vapor deposition effusion vessel comprising
a shell,
a crucible contained in the shell, the crucible having sidewalls,
a lid on the crucible, the lid having a planar top surface and plural nozzles, each nozzle having a wall extending upward, from the top surface of the lid, to a rim defining an aperture for effusing vapor from inside the crucible,
a heating element in the lid adjacent the wall of each nozzle, and
insulation material extending above the planar top surface of the lid next to the heading element and walls of the nozzles, but not above the rims of the nozzles.
2. The vapor deposition effusion vessel of claim 1 , wherein the shell contains insulation for surrounding the side walls of the crucible, the insulation including multiple layers of graphite foil and graphite felt.
3. The vapor deposition effusion vessel of claim 1 , wherein the side walls of the crucible are insulated and heated only indirectly from the heating element in the lid.
4. The vapor deposition effusion vessel of claim 1 , wherein the vessel has only one heating element.
5. The vapor deposition effusion vessel of claim 1 , wherein the heating element is U-shaped following a path running adjacent opposing sides of each nozzle.
6. The vapor deposition effusion vessel of claim 1 , wherein the lid has a U-shaped slot passing by opposing sides of each nozzle, the heating element being positioned in the slot.
7. The vapor deposition effusion vessel of claim 1 , wherein the heating element is controllable to maintain the lid and nozzles at temperatures higher then the temperature of molten material contained within the vessel.
8. The vapor deposition effusion vessel of claim 1 , wherein the heating element in the lid is configured to supply substantially all of the heat required to evaporate material from within the walls of the vessel through the nozzles in the lid.
9. The vapor deposition effusion vessel of claim 1 , wherein the lid is the only part of the vessel that has a heating element.
10. The vapor deposition effusion vessel of claim 1 , wherein each nozzle has an inner wall defining a depth, the heating element being embedded in the lid on a side of each nozzle adjacent substantially the entire depth of the nozzle.
11. The vapor deposition effusion vessel of claim 1 , wherein the nozzles are integrally formed into the lid.