Excitons as a probe of interface morphology in Cd(Zn)Se/ZnSe heterostructures

We present studies of the excitonic spectrum in superlattices (SLs) of CdSe insertions in a ZnSe matrix aimed at elucidating the CdSe/ZnSe interface morphology. The experimental photoluminescence excitation spectra are compared with the results of variational exciton calculations performed within th...

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Bibliographic Details
Published in:Applied surface science 2000-10, Vol.166 (1), p.278-283
Main Authors: Toropov, A.A., Shubina, T.V., Sorokin, S.V., Kyutt, R.N., Ivanov, S.V., Pozina, G.R., Bergman, J.P., Monemar, B., Karlsteen, M., Willander, M.
Format: Article
Language:English
Subjects:
CdSe/ZnSe
Exciton
Interface
Superlattice
TECHNOLOGY
TEKNIKVETENSKAP
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Summary:We present studies of the excitonic spectrum in superlattices (SLs) of CdSe insertions in a ZnSe matrix aimed at elucidating the CdSe/ZnSe interface morphology. The experimental photoluminescence excitation spectra are compared with the results of variational exciton calculations performed within the effective mass approximation. The shape of the average vertical (along the SL growth axis) distribution of CdSe within each insertion, used in the calculations, was obtained from a theoretical simulation of X-ray diffraction (XRD) rocking curves measured in the same samples. The results indicate that the thinnest layers are graded composition ZnCdSe quantum wells (QWs), generally homogeneous in the layer planes, whereas flat islands enriched by Cd appear at the CdSe nominal thickness larger than 0.5–0.6 monolayer (ML).
ISSN:0169-4332
1873-5584
1873-5584
DOI:10.1016/S0169-4332(00)00407-4