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Piezoreflectance in CdTe/(Cd,Zn)Te strained-layer superlattices: Periodicity effect, valence-band offset, and exciton binding energies

Physical Review B, ISSN: 0163-1829, Vol: 47, Issue: 15, Page: 9684-9692
1993
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We have investigated a series of CdTe/Cd1-xZnxTe strained-layer superlattices grown with low Zn concentrations (x<0.15). From differential spectroscopy techniques (wavelength modulations and piezomodulations) we identify all heavy-hole and light-hole exciton transitions. Confinement levels have been obtained by envelope-function calculations using a transfer-matrix algorithm. These levels depend not only on the barrier height, the layer thickness, and the material parameters, but also on the growth strain that rules the quadratic deformation in each layer (CdTe or Cd1-xZnxTe). From the comparison between the calculated transition energies and the experimental values obtained on a series of superlattices, we first deduce a weak chemical valence-band offset between the two materials. We also make an accurate estimation of the binding energies of heavy- and light-hole excitons as a function of the superlattice period, and finally derive the combined conditions of strain and period that control the type (I or II) of a CdTe/(CdZn)Te strained-layer superlattice. © 1993 The American Physical Society.

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