Seminar: "Semiconductor Nanomaterials for
Information and Energy Technologies" by Dr. Yajie Dong
Monday, October 6, 2014 11:00 AM to 12:00 PM
CREOL Room 103
CREOL Room 103
ABSTRACT:
Low dimensional nanomaterials (1 D nanowires and 0 D quantum
dots) represent important nanoscale building blocks with substantial potential
for exploring new device concepts and materials for nanoelectronics,
optoelectronics and energy technology applications. Three examples will be
presented. First, I will discuss my discovery of unique rectified
silver/amorphous silicon/crystalline silicon (Ag/a-Si/c-Si) crossbar resistive
random access memory (RRAM) effect in c-Si/a-Si core/shell nanowires and provide
a comprehensive comparison between nanowire based and planar silicon based
Ag/a-Si/c-Si RRAMs. The history of how this accidental nanowire based discovery
solved a decades-long sneak current problem in RRAM field and eventually
evolved into a game changing mainstream flash memory successor, Crossbar
Memory, will be presented. Then I will report the experimental realization of
high efficiency single coaxial group III-nitride heterostructured nanowire
photovoltaic devices and light emitting devices. Meanwhile, a universal van der
Waals epitaxial growth strategy for compound semiconductor nanowire arrays will
be discussed. The vision of how the combination of nanowire array growth and
heterostructured nanowire devices could possibly change the substrate limited status
of III-Nitride research fields will be outlined. Lastly, I will present how
quantum dots materials innovation and novel device structure design/processing
helped resolve one long standing issue for organic based light emitting
devices, the efficiency roll off at high driving current density. As a result,
record breaking ultrabright, highly efficient, low roll off inverted red
quantum dot light emitting devices (QLEDs) have been achieved (165,000Cd/m2 at
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Dean & Director, Professor of Optics
407-882-3326
BIOGRAPHY:
Dr. Yajie Dong is an assistant professor in NanoScience
Technology Center of University of Central Florida. He got his BS and MS
degrees in Chemistry from Tsinghua University of Beijing, China. In 2010, he
received his PhD degree from Prof. Charles Lieber's group at Chemistry and
Chemical Biology Department of Harvard University. From 2010 to 2012, he was a
postdoctoral associate working with Professors Yet-Ming Chiang and W. Craig
Carter in the department of Material Science and Engineering at the
Massachusetts Institute of Technology. Before joining NSTC of UCF in August
2014, he worked as a Senior Scientist for QD Vision Inc., a Nanotech Startup
based on research of Professors Moungi Bawendi and Vladimir Bulovic’s groups at
MIT and located in Lexington, MA. He is broadly interested in materials
challenges in nanoelectronics, optoelectronics and energy technologies,
particularly in nanoscale nonvolatile resistive switches for information
processing and storage, compound semiconductor nanowires or quantum dots based
high efficiency energy conversion (LED and PV) devices and new battery
materials and architectures for large scale energy storage.
For additional information:
Dr.
Bahaa SalehDean & Director, Professor of Optics
407-882-3326
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