Patent ID: 11866844
Assignee: GLOBALWAFERS CO., LTD.
Field: Surface technology, coating (Chemistry)
Classification: CPC C | IPC C

Claim 7:
8. A method for producing a single crystal silicon ingot from a silicon melt held within a crucible positioned within an ingot puller apparatus, the ingot puller apparatus including a dopant injector extending into a housing of the ingot puller apparatus, the dopant injector including a feed tube positioned within the housing and a vaporization cup positioned within the feed tube and the housing, the method comprising:
adding polycrystalline silicon to the crucible;
heating the polycrystalline silicon to cause the silicon melt to form in the crucible;
pulling the single crystal silicon ingot from the silicon melt;
injecting a liquid dopant into the feed tube;
vaporizing the liquid dopant into a vaporized dopant within the feed tube by:
heating the liquid dopant using the vaporization cup; and
reducing a pressure of the liquid dopant by injecting the liquid dopant into the feed tube, wherein the housing and the feed tube are maintained at a pressure below atmospheric pressure; and

contacting the vaporized dopant with a surface of the silicon melt to cause the vaporized dopant to enter the silicon melt as a dopant while pulling the single crystal silicon ingot from the silicon melt.