M. Godlewski et al., Cathodoluminescence studies of self-organized CdTe/ZnTe quantum dot structure grown by MBE: in-plane and in-depth properties of the system, SEMIC SCI T, 16(6), 2001, pp. 493-496
We report the results of low-temperature photoluminescence, room-temperatur
e cathodoluminescence (CL) and scanning CL and electron microscopy of self-
organized CdTe/ZnTe quantum dot (QD) structure. The in-depth profiling CL i
nvestigations were used to identify the microscopic origin of the CL emissi
ons observed at 2.13, 2.0-2.1 and 2.25 eV, In particular, we distinguish be
tween CL emissions originating from the QD region of the structure and from
the underlying buffer layers. Based on these measurements we assign the 2.
13 eV CL band to the wetting layer and the 2.0-2.1 eV band to the QD emissi
on. From the study of the in-plane and in-depth CL characteristics we demon
strate large in-plane fluctuations of the CL intensity and discuss their or
igin.