Characterization of Al0.047Ga0.953Sb layers grown on GaSb using reciprocal space maps

• The tilt is measured in the epilayers and is presented as function of thickness.
• To our knowledge the RSM technique has not been applied to AlGaSb /GaSb system.
• Tilt in these material seem to be necessary to accommodate the strain relaxation.
• Thickness values are in agreement with the Matthews and Blakeslee's model.

Structures of Al0.047Ga0.953Sb layers on GaSb (100) substrates were studied by high resolution X-ray diffraction (HRXRD) using reciprocal space maps (RSM) and rocking curves around the (004) and (115) reflections. The layers were grown at 450 °C with a supersaturation of 10 °C in a conventional Liquid Phase Epitaxy (LPE) system varying the growth time from 1 to 4 min resulting in an increment of thickness. It was found that tilt, relaxation and dislocation density of the layers can be calculated using its rocking curves and reciprocal space mapping and it is found that these characteristics are influenced by the thickness of layer.