Comparison between vertical Bridgman and feeding techniques for GaInSb alloy growths

Characterization of undoped and Te-doped GaSb crystals grown by the vertical feeding method

“…In classical methods, the axial segregation pattern for dilute Te-doped ingots usually follows the so-called Scheil law, which corresponds to a higher Te content at the top of the ingot compared with the bottom. A transgression of this law was previously observed, for In atoms, in Ga 1Àx In x Sb alloys grown by VFM [3]. In the case of Te-doped GaSb dilute alloy, the Te segregation coefficient at equilibrium is about k 0 ¼ 0.37 [4], but when growth occurs far from equilibrium, the effective segregation coefficient (k e ) differs from its equilibrium value approaching unity.…”

“…A detailed description of the VFM has been reported in our previous works [2,3]. Briefly, it consists of a two separated vertical crucibles set-up placed in a two-zone furnace, where the temperature of each zone is controlled independently as it is shown on Fig.…”

“…We recently proposed a vertical feeding method (VFM) for bulk semiconductor crystal growth based on the possibility of continuously feeding the growing melt [2]. Bulk crystals of the In x Ga 1Àx Sb ternary alloy have already been grown using this technique [3]. Undoped GaSb is almost always p-type irrespective of growth techniques and conditions.…”

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

“…Our experience in bulk growth of GaInSb materials prepared by the Vertical Bridgman technique showed that the In concentration increase along the growth axis following a Scheil law [11] leading to a low yield for the production of substrates with high In content.…”

Study of defects in In x Ga 1– x Sb bulk crystals

“…After solidification, the furnace was slowly cooled down to room temperature. A Te-doped In x Ga 1-x Sb ingot of the same size of the undoped crystal, with a 6% nominal In content, was grown by the Vertical Feeding Method (VFM) [8] with continuous feeding in a two-zone furnace. The feeding material was heated up to a few degrees above the melting temperature for 6 h. The temperature of the growing chamber was held at 580 ºC and the feeding rate set to 5 mL/min.…”