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.