Patent ID: 8043428

Claim:
A method of manufacturing a silicon monocrystal, the silicon monocrystal being grown by the Czochralski method from a silicon melt with an N-type dopant added, the method comprising: preliminarily growing silicon monocrystals by the Czochralski method from silicon melts with the N-type dopant added under various dopant concentrations C (atoms/cm 3 ), and obtaining for each of the grown monocrystals a ratio G ave /V between an average temperature gradient G ave (K/mm) and a pulling-up speed V (mm/min); preparing a scatter diagram of the dopant concentrations C and ratios G ave /V corresponding to the grown monocrystals, in which the dopant concentration C is plotted on a horizontal axis and the ratio G ave /V is plotted on a vertical axis; identifying in the scatter diagram a critical line at which compositional supercooling occurs; and based on the critical line, growing the silicon monocrystal such that G ave /V of the grown monocrystal has a value at which the compositional supercooling does not occur, at the dopant concentration C of the silicon melt.