Patent ID: 8771560
Filing Date: 2014-07-08
Classification: C30B

Abstract:
1. An n-type III-V semiconductor single crystal ingot having a diameter of at least about 100 mm, wherein the ingot is produced by a process of vertically directed solidification of a melt of semiconductor material, in which process the semiconductor melt was covered by a cover melt, and wherein the ingot satisfies the following conditions within its cylindrical part at each axial position corresponding to mass fractions g of solidified melt between 0.1 and 0.9: a concentration of an electrical conductivity-generating dopant in a range of about 1×10 a concentration of an impurity, which is present due to the manufacturing process for the single crystal from the cover melt, in a range of about 1×10 an electrical conductivity of at least about 250 Siemens/cm, and/or a specific resistivity of at most about 4×10