Transport and growth of GaSe from the vapour phase

A comparative study of the sublimation and chemical transport of the compound GaSe is reported. The parameters investigated in the closed system are the iodine concentration, the tube geometry, and under-cooling. The rate of transport in case of sublimation is diffusion-controlled, in the iodine-assisted transport process both diffusion and convection play a role. If the sublimation technique is used, the crystals are not exclusively plate-like, the majority of the crystals exhibit needle-like and ribbon-like habit. With growth in the length direction, the growth axis is parallel to the c-axis, it takes place around screw dislocations and two crystallization mechanisms are assumed to take place simultaneously.