Landolt-Börnstein - Group III Condensed Matter

Zincblende sulphide/selenide superlattices

Abstract

This chapter discusses properties of zincblende sulphide/selenide superlattices (SL). The CdSe/CdS and CdS/ZnSe zincblende sulphide/selenide SL have a type-II band alignment. Excitonic emission in CdSe/CdS SLs is found in the range between 1.6 and 2.4 eV. The dependence of the exciton transition energy on SL period is reported. Photoluminescence (PL) and photoluminescence excitation (PLE) spectra of CdS/ZnSe SLs are found in the range 2.0 to 2.65 eV. The CdS layer has a lattice mismatch of -2.6% to ZnSe in these structures which are grown on a ZnSe buffer. The PL maximum in these SL shows a characteristic S-like red-blue-red shift (non-monotonous Stokes shift) with increasing temperatures reflecting relaxation and (non)thermal distribution of localized excitons. A filling of the lowest miniband is observed in interminiband spectroscopy of doped or optically pumped CdS/ZnSe superlattices. ZnSe/ZnS strained layer superlattices may exhibit a transition from type-I to type-II band alignment when strained to a ZnS substrate. ZnSe/MgS, ZnSe/(Zn,Mg)S, and ZnS/ZnS superlattices are used as distributed Bragg reflectors.

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Title
Zincblende sulphide/selenide superlattices
Book Title
Optical Properties. Part 2
In
Superlattices and coupled quantum-well structures of II-VI compounds
Book DOI
10.1007/b98078
Chapter DOI
10.1007/10860224_25
Part of
Landolt-Börnstein - Group III Condensed Matter
Volume
34C2
Editors
  • C. Klingshirn Send Email (10)
  • Editor Affiliation
  • 10 Institut für Angewandte Physik, Universität Karlsruhe (TH), 76131, Karlsruhe, Gemany
  • Authors
  • H. Kalt Send Email (101)
  • Author Affiliation
  • 101 Institut für Angewandte Physik, Universität Karlsruhe (TH), 76131, Karlsruhe, Gemany
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