St. Albert Hall B-37
Department of Physics, St. John’s
University Society of Physics Students Chapter
Optical Properties and Morphology of
Semiconductor Nanostructures and DevicesDr. Mahua Biswas, New York City
College of Technology, CUNY, NY
Science and technology at nano-scale have numerous opportunities
both for fundamental research and new applications; hence
understanding of underlying fundamental physical phenomena in such
structures is very important for future progress.
The talk will mainly concentrate on the results of optical and
morphological properties of zinc oxide (ZnO) nanostructures, while
the optical and morphological properties of organic semiconductors
for photovoltaic applications will be discussed as future work.
Low dimensional nanostructures of ZnO have potential to improve
the efficiency and compactness of electronic and photonic devices
including LEDs, optical waveguides and sensors. Research work on
ZnO nanostructure growth and characterisation, concentrating
specifically on ZnO nanorod and nanowall systems on sapphire and Si
substrates grown using vapour phase transport (VPT) method will be
Emphasis will be given on the experimental results on the growth
mechanism of ZnO nanostructures, the effects of various growth
parameters, and characterisation (and control) of various physical
properties of ZnO nanostructures. The optical and morphological
properties of the active layer contribute to the generation of
electron-hole pairs (excitons) and their dissociation in an organic
photovoltaic cell. A possible future work on improving the optical
and morphological properties of the active layer of different
polymers/fullerene based solar cells will be discussed.
All interested students and faculty are invited.