I. Self-Assembled Semiconductor
Epitaxical Quantum Nanostructures for Electronics /
Optoelectronics
Self-assembled
epitaxical quantum nanostructures are a class
of nanostructures created by exploiting naturally occurring
forces between the constituents, usually atoms and/or
molecules, and a crystalline substrate such that the
atoms of the resulting nanostructure have a definite
spatial relationship with the underlying substrate atoms.
Since the nanostructures form during a film growth process,
rather than through post-growth patterning and etching
on the nanoscale, these have been dubbed self-assembled
(or self-organized) nanostructures. Examples
of such nanostructures are seen in the images shown
here.
To
learn more about how these are created, their physical
properties, and their use in advanced semiconductor
devices, click on the appropriate sections below.
I.1 Nanostructure Synthesis and
Structural Evolution:
Emphasis
is on atomic level understanding and controlled manipulation
of the synthesis processes, control on quantum dot size
distribution, and spatially-selective positioning of
countable ensembles of QDs. If you
can't make it, you can't study it!
I.2 Electronic Properties:
Mostly absorption/luminescence
and photoconduction related.
I.3 Devices:
Emphasis
is on demonstration of concepts via existence theorems.
Current focus is mainly on mid (2-5 µm) and long
wavelength (8-12 µm) quantum dot infra-red photodetectors
(QDIPs).
The
QD detector program is being carried out in collaboration
with Prof.
J.C.Campbell (Univ. of Virginia; EE Dept.).
A
major part of this effort is supported by the MURI (Multidisciplinary
University Research Initiative) Program on Nanoscience
through the AFOSR.
Other research areas
II.Nanocrystal Quantum Dots
III.Hybrid Biochemical / Inorganic Structures
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