Suppression of doping striations in zone melting of InSb by enhanced convection on a centrifuge
Abstract An experimental study of convective effects in horizontal zone melting of InSb at large inertial accelerations (up to 30 times earth gravity) is reported. The experiments were carried out on a centrifuge arrangement which permits to vary the driving force of convection in a wide range. The occurrence of temperature fluctuations in the melt zone and of doping striations in the growing crystal is investigated in dependence on resulting acceleration. This is explained by unsteady convection which is discussed in relation to existing theoretical work. A suppression of unsteady convection and doping striations at large acceleration is reported which has been observed for the first time in horizontal zone melting.
A conception and method of space breeding mechanism study with solid statenuclear track detector is briefly introduced. The detector system, etching conditionsand measured parameters are described. The methodology of particle identification isdiscussed. Finally, dependence of variation observed in the field on hitting particlesis analysed.