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OPTICAL CHARACTERIZATION OF CdZnTe/ZnTe
HETEROSTRUCTURES MODIFIED BY ELECTRON
OR X-RAY IRRADIATION
M. Sharibaev
1
, D. Asеnbayeva
2
1
Berdakh Karakalpak State University (Nukus, Uzbekistan)
2
Nukus Branch of the Tashkent University of Information Technologies
Strained II
VI low-dimensional heterostructures are of great interest due to a
possibility of efficient production of coherent and incoherent light-emitting devices
that cover practically the whole visual spectral region. However, their potentialities
for fabrication of such emitting devices as lasers (including those with e-beam
pumping [1]) are limited by short time of operation. The reason for this lies in
degradation processes occurring during lasing, structure growth process and/or
post-growth treatments. Degradation of these heterostructures usually is attributed
to dislocation generation and multiplication in the device active area. Point defect
generation or their transformation, as well as stress relaxation, may play an
important role in such processes too. In this work the effect of electron and X-ray
irradiation on the optical properties of CdZnTe/ZnTe quantum-size structures has
been investigated. Electron irradiation is known to result in generation of both
point defects and electron-hole pairs, while X-ray treatment produces free carriers
only.
We studied the II
VI/GaAs structures containing both ZnTe epilayers and ZnTe
epilayer with Cd
x
Zn
1-
x
Te quantum wells (QWs) of different widths
L
Z
. They were
MBE-grown using a KATUN’ machine equipped with conventional effusion cells
for high-purity elements. The residual pressure in the chamber was ~ 10
-8
Pa. After
oxygen removal the (001) GaAs substrate was cooled from 580
C down to room
temperature and then covered by an amorphous ZnTe layer 5 nm thick that was
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