Solidification features of cast and vertically fed Te-doped GaSb materials

Microstructure and solidification behavior of cast GaInSb alloys

“…The indium spatial distribution of the as-grown materials has been characterized with back-scattered electron (BSE) imaging and EDAX microprobe. The comparison with previous VFM experiments carried out in the same experimental conditions with undoped and dilute GaSb alloys [12,13] and thermal measurements performed during quenching experiments enable to identify different phenomena that lead to the microstructures observed in our GaInSb VFM experiments.…”

“…The VFM setup used in this work has been described elsewhere [12,13]. Briefly, it consists of a two separated vertical crucibles setup placed in a two-zone furnace.…”

“…In this work, a set of experiments has been carried out using the casting configuration of the VFM which corresponds to a rapid feeding of the growth crucible [13], about 10 mL/min. In the low casting (LC) configuration the DT furnace is set at 120 K while in the high casting (HC) configuration a higher DT furnace of about 500 K is used.…”

Technical Developments and Principal Results of Vertical Feeding Method for GaSb and GaInSb Alloys

“…These results demonstrated that monocrystals can be produced by VFM and suggested that segregation control may be also achievable. Using the High Casting, High Feeding and Low Feeding configurations [13], Te-doped materials with a homogenous solute content have been effectively obtained. The samples showed different grain structures and sizes with average values ranging from 0.5 mm for HC-Te samples to several mm for LFeed-Te samples, as shown on figure 3a, demonstrating that monocrystals can also be achieved for Te-doped GaSb prepared by the VFM.…”