System and method for producing single crystal

A single crystal manufacturing system comprising:

• a single crystal pulling-up apparatus comprising a chamber, a heater, a crucible, a pulling-up mechanism for a crystal, a camera, and a rotating mechanism that rotates the crucible while being heated in the chamber, the single crystal pulling-up apparatus calculates a diameter measurement value of a growing single crystal during a pulling-up process of the growing single crystal according to a CZ method, calculates a first diameter of the growing single crystal by correcting the diameter measurement value using a diameter correction coefficient, and controls a diameter of the growing single crystal based on the first diameter;
• a diameter measuring apparatus that measures, under room temperature, a diameter of a previous single crystal pulled up by the single crystal pulling-up apparatus to calculate a second diameter;
• and
• a database server that acquires the first diameter and the second diameter from the single crystal pulling-up apparatus and the diameter measuring apparatus, respectively, and manages them, wherein
• the database server calculates a correction amount of the diameter correction coefficient from the first and second diameters obtained at diameter measurement positions which coincide with each other under room temperature and corrects the diameter correction coefficient using the calculated correction amount,
• the database server corrects the diameter measurement position of the growing single crystal in a longitudinal direction due to thermal expansion to coincide with a diameter measurement position of the previous single crystal at room temperature;
• the database server transmits the calculated correction amount to the pulling-up apparatus;
• and
• the pulling-up apparatus updates the diameter correction coefficient to grow a single crystal.