PHOTOLUMINESCENCE STUDY OF LIQUID-PHASE ELECTROEPITAXIALLY GROWN GAINASSB ON (100)GASB

Low-temperature (4.5 K) photoluminescence (PL) spectra of liquid phase electroepitaxially grown GaSb and GaInAsSb have been examined. The excitonic transitions observed in GaSb and GaInAsSb layers of compositions close to the GaSb comer of the phase diagram indicate an excellent quality of the grown layers. A systematic trend in the low-temperature PL spectra is observed with the change in the alloy composition. The overall PL emission efficiency decreases and the number of excitonic transitions are fewer with the shift in the composition towards the lower band gap. Shift in the PL peak energy corresponding to the band to band transition with temperature was determined. The linear part of the shift above 100 K exhibits a slope of -0.3 meV/K.