Patent ID: 8980445
Filing Date: 2015-03-17
Classification: C30B

Abstract:
1. An off-axis single crystal silicon carbide wafer made by a method of: cutting a seed crystal of silicon carbide from a bulk single crystal of silicon carbide at an angle with respect to the c-axis of the bulk crystal to produce a seed crystal with a seed face that is off-axis with respect to the c-face of the bulk crystal; applying a thermal gradient to the seed crystal in a seeded growth system in a direction that is perpendicular to the seed face of the seed crystal and non-perpendicular with respect to the c-face of the seed crystal to produce a right cylindrical crystal that is between 0.5° and 12° of axis with respect to the c-face and that is at least 100 mm in diameter; and cutting the off-axis single crystal silicon carbide wafer from the right cylindrical crystal by cutting the right cylindrical crystal perpendicular to the right cylindrical crystal to produce the off-axis single crystal silicon carbide wafer; wherein the off-axis single crystal silicon carbide wafer has circular, substantially parallel faces that are between about 0.5° and 12° off-axis with respect to a {0001} plane and that have at least a 100 millimeter diameter, a circumferential edge that is perpendicular to the circular, substantially parallel faces, a surface micropipe density between 1 cm