Abstract
II-VI compound crystals, such as CdS, CdSe and ZnO crystals with wurtzite structure, were grown from the vapor under an electrostatic field. When the potential of a central minus electrode was kept at a value less than several tens of volts, CdS crystals grew preferentially in the +c direction on the central electrode placed in the growth zone, but they grew preferentially in the -c direction when the potential was kept at a higher value than the former. These growth features are the same when crystals were grown on the polar surface of a CdS substrate fixed on the central electrode. On the other hand, when crystals grew in an atmosphere containing excess group II atoms or group VI atoms, without an electric field they grew dominantly in the +c or the -c direction respectively. These results suggest that the electrostatic field accelerates the preferential deposition of one of the ionized constituent atoms onto the growth surface and causes a difference in the growth rate between two polar surfaces.
