Cathodoluminescence spectra of tensile strained ZnSe/ MBE single quantum wells

Abstract

This paper discusses the hydrostatic and shear deformation potentials of ZnSe by investigating cathodoluminescence (CL) spectra of biaxial tensile strained ZnSe/Zn 1−x Mg x Se single quantum wells (SQW). The dependence of the shift of light-and heavy-hole exciton lines on the built-in strain of these MBE-grown strained layer heterostructures is discussed. We found a hydrostatic deformation potential of a = −5.3 ± 0.4 eV and a shear (tetragonal) deformation potential of b = −1.0 ± 0.1 eV. From the temperature dependence of the ground state exciton energy, an exciton gap 2700 ± 3 meV at T = 297 K was deduced for unstrained bulk ZnSe.

Optical investigation of strain-balanced superlattices

“…3. Fitting to the linear part of this curve with I lh /I hh ∼ exp(E a /kT ) [10], where k is the Boltzmann constant, allowed the activation energy (E a ) for the process of thermal excitation occurring in this material to be estimated. The activation energy for this process is found to be 41 ± 1 meV, which compares well with the separation 39 ± 2 meV measured for the e1-hh1 to e1-lh1 separation using the low-temperature absorption measurements.…”