FRANK ERNST RESEARCH GROUP
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In collaboration with
C. Burda (CWRU), we have
studied the structure of semiconductor
quantum wells in quantum dots (QWQDs)
consisting of ZnS and CdS. These QWQDs
will be nanoscopic particles with an
onion-type, core-shell architecture,
consisting of epitaxial layers of ZnS
and CdS. (Fig. 1) Owing to the
extremely small dimensions of the
nano-particles, the inherent ZnS/CdS
interfaces will have an extremely high
curvature, which is anticipated to
better allow for lattice-mismatch
accommodation. An effective search for
optimum fabrication parameters
necessitates retrieving structural and
chemical information at or near the
atomic scale. This requires advanced
methods of high-resolution and
analytical transmission electron
microscopy. A combination of
high-resolution and analytical TEM
together with iterative image
simulation procedures will be used to
achieve atomic scale resolution of the
3D nanocrystal structure.
For more information click here.
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Fig. 1: QWQD structure,
a0=0.6293nm.
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Fig. 2: Simulated QWQD 3D structure,
Zn: dark-grey, Cd: red, Te: aqua.
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