Center for Excitonics
Seminar Series Announcement
The Center for Excitonics (
http://www.rle.mit.edu/excitonics) invites you
to join us at the next seminar of the
2009 series. Please forward this information on to others who might be
interested in attending this and other seminars.
Title: Excitonic Processes in Nanostructured
Optoelectronic Devices
Presenter: Prof. Vladimir Bulovic
Organization: Department of Electrical Engineering and
Computer Science and
Research Laboratory of Electronics
MIT
Date: April 1, 2009
Time: 3:00 - 4:00pm
Place: 36-428
Refreshments: Yes
URL:
http://www.rle.mit.edu/excitonics/bulovic-040109.html
Abstract
Nanoscale materials such as molecules, polymers, and nanocrystal quantum
dots can be assembled into large area
functional optoelectronic devices that can surpass the performance of
today’s state-of-the-art technologies. Advances
in thin film processing of nanostructured material sets and concomitant
development of physical models of nanostructured
device operation are rapidly advancing this science and engineering field.
This talk will highlight the contribution of excitonic
processes in the optical and electrical response of nanostructured
optoelectronic devices, singling out the exciton diffusion as
the dominant governing process in many active structures. In light
emitting diodes, exciton diffusion affects the degree of
cascade energy transfer and the color saturation, and in solar cells,
photodetectors, and chemosensors, exciton diffusion to
interfaces is the central process in determining the exciton dissociation
efficiency, and the consequent photogeneration efficiency.
The talk will illustrate excitonic behavior using both specific technology
examples, as well as by describing model structures that
highlight the origin and influence of exciton energy disorder, the exciton
dynamics in mixed excitonic systems, and the related
challenges in measuring the exciton diffusion length.
Bio
Professor Vladimir Bulovic is a principal investigator in the Research
Laboratory of Electronics (RLE) at the Massachusetts Institute
of Technology (MIT). Professor Bulovic was graduated from Princeton
University with a B.S.E. (1991), M.A. (1995), and Ph.D. (1998)
in Electrical Engineering.
Professor Bulovic joined the faculty of MIT in 2000 as an Assistant
Professor of Electrical Engineering and Computer Science. His research
interests include studies of physical properties of organic and
organic/inorganic nanodot composite thin films and structures, and
development of novel optoelectronic organic and hybrid nano-scale devices.
In 2004, Professor Bulovic was named as one of the TR100, the list of top
young innovators in technology named annually by Technology Review
magazine. In the same year, he also was awarded the Presidential Early
Career Award (PECASE), the nation's highest honor for scientists and
engineers at the beginning of their research careers.
Prior to joining MIT, Professor Bulovic was a Senior Scientist and Project
Head of Strategic Technology Development at Universal Display Corporation
(UDC). At UDC he worked on the application of organic materials to LEDs
for full color flat panel displays and thin film photovoltaics for solar
cell and detector applications. His work resulted in development of OLED
backlights, pixilated arrays of stacked OLEDs, and improved performance of
phosphorescent OLEDs. Prior to joining UDC he worked in Princeton's POEM
Center as a graduate researcher (1993-1998) and research associate
(1998-1999). At Princeton, Professo Bulovic participated in a series of
projects examining optical and electrical properties of vacuum deposited
amorphous and crystalline molecular organic thin films and devices. His
work resulted in development of OLED technologies such as transparent,
inverted, and stacked OLEDs, demonstration of the first optically pumped
organic semiconductor lasers, and understanding of photogeneration in
organic photovoltaic devices, microcavity effects in luminescent devices,
and the solid state solvation effects in polar organic media. From
1991-1993, Professor Bulovic worked at Columbia University's
Microelectronics Sciences Laboratory, where for he examined
image-potential states and resonances on metal surfaces utilizing
non-linear two-photon photoemission spectroscopy.