Patent ID: 6858077

Claim:
A method of producing a single crystalline silicon ingot by a Czochralski Method wherein the ingot has a predetermined radius from a central axis and includes a body having a predetermined length along the central axis, the method comprising the steps of: reducing an axial temperature gradient of a circumferential part of the body by installing a heat shield to prevent the body of the ingot grown from a melt-down silicon from being cooled down abruptly and by adjusting a melting gap between a lower part of the heat shield and a surface of the melt-down silicon; forming an oxidation-induced stacking fault ring as a coaxial-type ring at a circumferential part furthest from the central axis by controlling a growth speed and maintaining a uniform overall axial temperature gradient by making the axial temperature gradient of a central part similar to that of the circumferential part by increasing the axial temperature gradient of the central part by reducing temperature of upper parts of the ingot and the heat shield; and forming a micro-vacancy defect area having no FPD just inside the oxidation-induced stacking fault ring in a direction toward the central axis.