Patent ID: 8518180

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 shielding means that thermally shields an inside of the sample chamber from an inside of the pulling furnace; a sample tube that can move up and down between the inside of the sample chamber and the inside of the pulling furnace; an elevation/descent means provided with a guide rail on which the sample tube can slide and a wire mechanism that moves the sample tube up and down along the guide rail; and a supply pipe inside the pulling furnace, the supply pipe configured to supply the dopant discharged from the sample tube to the melt, wherein: the supply pipe comprises a concave-shaped sample tube receiver, and the sample tube comprises a substantially spherical-shaped doping projection configured to matingly contact the sample tube receiver when the sample tube moves down along the guide rail, the doping projection further configured to disengage from the sample tube receiver when the sample tube moves up along the guide rail.