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Science at the Edge
Engineering Seminar
November
13th, 2015
11:30
a.m., Room1400 Biomedical and
Refreshments
served at 11:15 a.m.
Ali Javey
Electrical Engineering and
Computer Sciences
University of California,
Berkeley
2D Semiconductor
Electronics: Advances, Challenges and Opportunities
Abstract
Two-dimensional (2-D) semiconductors exhibit
excellent device characteristics, as well as novel optical,
electrical, and optoelectronic characteristics. In this talk, I
will present our recent advancements in defect passivation,
contact engineering, surface charge transfer doping, and
heterostructure devices of layered chalcogenides. We have developed a defect
repair/passivation technique that allows for observation of
near-unity quantum yield in monolayer MoS2. The work
presents the first demonstration of an optoelectronically
perfect monolayer. Forming Ohmic contacts for both electrons and
holes is necessary in order to exploit the performance limits of
enabled devices while shedding light on the intrinsic properties
of a material system. In this regard, we have developed
different strategies, including the use of surface charge
transfer doping at the contacts to thin down the Schottky
barriers, thereby, enabling efficient injection of electrons or
holes. We have been able
to show high performance n- and p-FETs with various 2D
materials. Additionally,
I will discuss the use of layered chalcogenides for various
heterostructure device applications, exploiting charge transfer
at the van der Waals heterointerfaces. I will also present
progress towards achieving tunnel transistors using layered
semiconductors.
Bio
Professor Ali
Javey is the Conexant
Systems Distinguished Professor at the University of
California, Berkeley. He
received a Ph.D. degree in chemistry from Stanford University
in 2005, and was
a Junior Fellow of the Harvard Society of Fellows from 2005 to
2006. He then
joined the faculty of the University of California at Berkeley
where he is
currently a professor of Electrical Engineering and Computer
Sciences. He is
also a faculty scientist at the Lawrence Berkeley National
Laboratory where he
serves as the program leader of Electronic Materials (E-Mat).
He is an
associate editor of ACS Nano. He is the co-director of
Berkeley Sensor and
Actuator Center (BSAC), and Bay Area PV Consortium (BAPVC).
Professor
Javey's research
interests encompass the fields of chemistry, materials
science, and electrical
engineering. His work focuses on the integration of nanoscale
electronic
materials for various technological applications, including 2D
electronics, flexible
circuits and sensors, and energy generation and harvesting.
His awards include
Nano Letters Young Investigator Lectureship (2014); UC
Berkeley Electrical
Engineering Outstanding Teaching Award (2012); APEC Science
Prize for
Innovation, Research and Education (2011); Netexplorateur of
the Year Award
(2011); IEEE Nanotechnology Early Career Award (2010); Alfred
P. Sloan Fellow
(2010); Mohr Davidow Ventures Innovators Award (2010);
National Academy of
Sciences Award for Initiatives in Research (2009); Technology
Review TR35
(2009); NSF Early CAREER Award (2008); U.S. Frontiers of
Engineering by
National Academy of Engineering (2008); and Peter Verhofstadt
Fellowship from
the Semiconductor Research Corporation (2003).
For further
information please contact Prof. Richard Lunt, Department of
Chemical Engineering and Materials Science at [log in to unmask]
Persons with disabilities have the right
to request and receive reasonable accommodation. Please call the
Department of Chemical Engineering and Materials Science at
355-5135 at least one day prior to the seminar; requests
received after this date will be met when possible.