Patent ID: 8114215
Filing Date: 2012-02-14
Classification: C30B,Y10T

Abstract:
1. An apparatus for manufacturing a silicon single crystalline ingot by a HMCZ (Horizontal Magnetic Czochralski) method, the apparatus comprising an upper heat shield structure, the upper heat shield structure being spaced apart with a predetermined gap from a surface of a silicon melt contained in a crucible and arranged around a silicon single crystalline ingot pulled from the silicon melt, and the upper heat shield structure having a cross section taken in the lengthwise direction of the ingot, the cross section including: an outer wall extending vertically or slantly relative to the surface of the silicon melt; an inner wall having an inner slant surface facing the ingot opposite to the outer wall and approaching to the ingot downwards, and an inner vertical surface extending substantially vertically downwards from a lower end of the inner slant surface; and a lower surface having a lower slant surface extending towards the inner wall from a lower end of the outer wall and going away from the surface of the silicon melt at a first angle relative to the surface of the silicon melt, a lower downward surface extending downwards from an end of the lower slant surface at the side of the inner wall, and a lower horizontal surface extending substantially horizontally towards the inner vertical surface from a lower end of the lower downward surface and meeting the inner vertical surface, wherein the first angle is 2° to 8°, so that a screw dislocation which may be generated in the silicon single crystalline ingot due to the HMCZ method is controlled.