Determination of well widths in a MOVPE-grown InGaAsrInP multi-quantum well structure using SIMS and photoluminescence

The well and barrier widths of MOVPE-grown In1yxGaxAsrInP xs0.47.quantum well QW.structures have been examined by secondary ion mass spectroscopy SIMS.. The well widths varying from 25 to 150 A° were also estimated through photoluminescence PL. measurements. It was found that the differences in estimation of well width by PL and SIMS are due to differences in sputtering rates between InGaAs and InP during SIMS measurements, the rate being found to be 1.38–1.97 times less for the former. The presence of interfacial layers of ;2 monolayers width between well and barrier with low sputtering rate was also inferred. q2000 Published by Elsevier Science B.V. All rights reserved.