Growth and characterisation of high quality GaInP/AlGaInP quantum wells by solid-source molecular beam epitaxy

Photoluminescence (PL), photoluminescence excitation (PLE) and X-ray diffraction (XRD) data on GaInP/Al(Ga)InP quantum wells (QW's) grown by solid source molecular beam epitaxy (SSMBE) is presented. The structural and optical properties of QW's grown with either ternary Al/sub 0.52/In/sub 0.48/P or quaternary (Al/sub x/Ga/sub 1-x/)/sub 0.52/In/sub 0.48/P (x/spl sim/0.53) barriers is contrasted. Both barrier types offer the prospect of high quality structures as demonstrated by narrow PL and XRD linewidths. The PL of thin QW's (/spl les/20 /spl Aring/) is however considerably degraded for the case of AlInP barriers due to reduced electron confinement compared to quaternary AlGaInP. PL and PLE measurements reveal a large Stokes' shift for these QW's, which is clear evidence for a change from type-I to type-II behavior. This observation, together with calculations based on PLE data for the E1-HH1 ground state energy, gives limits on the range of conduction band offsets that may be used which are consistent with the value /spl Delta/E/sub c/=0.67/spl Delta/E/sub g/ recently reported in the literature.<
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