| 摘要 |
<p>The present invention relates to a device and method for producing a single crystal, in particular, a device for producing a single crystal by pulling it by the Czochralski method in which the temperature distribution and thermal history of a pulling single crystal are controlled to improve the production efficiency of single crystals and the qualities thereof, and a method for producing a single crystal by using the device. The present invention provides a device for producing a single crystal by the Czochralski method which is provided with a cylinder (19) coaxially surrounding a pulling single crystal rod, the upper end thereof being airtightly connected to the ceiling of a pulling chamber and the lower end thereof being close to the surface of melt in a crucible, characterized in that a heat insulator (25) is attached to the lower end of the cylinder (19), the heat insulator being surrounded by the surface of the crystal, the inside wall of the crucible and the surface of the melt, and, having such a size as occupying 30 % by volume to 95 % by volume of the space above the melt and having such a height as corresponding to the radius of the pulling crystal, and a method for producing a single crystal by using the device, a method for controlling temperature distribution and thermal history of a pulling crystal, and furthermore a single crystal produced by the method. The device of the present invention has the heat insulator (25) which has a sufficient heat insulating effect, so that a device and a method for producing a single crystal in which, even if the diameter of a single crystal to be pulled is increased, the pulling speed of the crystal is not lowered, the uniformity of temperature of the entire crystal-melt interface is improved and the ratio of single crystallization is not reduced, and which is capable of easily and precisely controlling the thermal history and temperature distribution of the crystal, are provided. <IMAGE></p> |
