Band alignments in Zn(Cd)S(Se) strained layer superlattices

C Trager-Cowan, P J Parbrook, B Henderson, K P O'Donnell

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31 Citations (Scopus)

Abstract

The authors estimate, by reviewing the available photoluminescence data, the band alignments at heterojunctions of Zn(Cd)S(Se) semiconductors. The photoluminescence peak energies of ZnSe-ZnS, CdS-ZnS and CdSe-ZnSe strained layer superlattices (SLS), with a range of well and barrier widths, have been calculated using Kronig-Penney theory and assumed values of the band offsets which yield acceptable fits to both the experiments and data taken from the literature. For ZnSe-ZnS SLS, fair agreement is obtained between calculation and experiment by assuming, in line with previous work, a negligible conduction band offset. At the same time, good estimates of the photoluminescence peak energies of CdS-ZnS and CdSe-ZnSe superlattices are obtained by assuming a negligible valence band offset in each case. The authors construct a band alignment diagram which predicts that CdSe-CdS and CdS-ZnSe are type-II SLS with electron confinement in the CdS layers; these predictions are borne out by experiment.

Original languageEnglish
Article number016
Pages (from-to)536-541
Number of pages6
JournalSemiconductor Science and Technology
Volume7
Issue number4
DOIs
Publication statusPublished - 1 Dec 1992

Keywords

  • photoluminescence
  • strained layer superlattice
  • Kronig-Penney theory

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