A COMPARISON OF SPECTROSCOPIC AND MICROSCOPIC OBSERVATIONS OF ION-INDUCED INTERMIXING IN INGAAS INP QUANTUM-WELLS/

Using n-doped InGaAs/InP multi-quantum-well samples we compare measure ments of ion-beam-induced quantum well broadening made by cross-sectio nal scanning tunneling microscopy and cross-sectional scanning transmi ssion electron microscopy with the broadening calculated from the blue shift of the low temperature photoluminescence peak using different mo dels of the intermixing process. Results are consistent with a simple square well model used to interpret photoluminescence shifts, but disa gree with a model of separate Fick's law diffusion on group III and V sublattices. (C) 1998 American Institute of Physics.