Patent ID: 8920561

Claim:
A silicon single crystal pull-up apparatus that pulls a doped silicon single crystal from a melt by Czochralski method, the apparatus comprising: a pulling furnace; a sample chamber that is externally attached to the pulling furnace and houses a sublimable dopant; a sample tube that can move up and down between an inside of the sample chamber and an inside of the pulling furnace; an elevation/descent means that moves the sample tube up and down; a supply pipe that is provided inside the pulling furnace and supplies the sublimable dopant discharged from the sample tube to the melt; and a joint means that joins the sample tube with the supply pipe, wherein the joint means is composed of a convex portion that projects from a first end of the sample tube and a concave portion that is provided in a first end of the supply pipe and formed such that the convex portion can fit thereinto; the joint means is configured in a ball joint structure in which contacting surfaces of the convex portion and the concave portion are formed to be curved surfaces and the convex portion fits into and is joined with the concave portion; and a flow path is formed between the sample tube and the supply pipe.