InSb single crystals were grown in the < 111 > direction by a modified Czochralski method. Ultrasonic waves at a frequency of 0.71 MHz were introduced into the melt parallel and perpendicular to the pulling axis at frequencies of 1.25, 1.44, and 2 MHz under the solid-liquid interface. The influence of solid-liquid interface shape on morphology and elimination of striations was found during crystal growth due to the effect of the ultrasound in two orthogonal directions. (C) 2012 Published by Elsevier B.V.