Wide
bandgap semiconductors (WBG) such
as nitrides semiconductors have transformed lighting
technologies and radar systems, and they will enable next-generation power
systems, display technologies, and ultraviolet (UV) emitters, which can
mitigate future health and economic risks. For example, deep-UV light-emitting
diodes (UV-C LEDs) can be employed in systems to improve access to safe water,
fighting c antibiotic-resistant bacteria, and reduce the spread of
infectious diseases by disinfecting air, surfaces, or water—especially since
the frequency of new pandemics have been increasing over the past 100
years (1-3).
In
this talk, I discuss AlGaN heterostructures physics and their applications in
UV LEDs and laser diodes. First, we will discuss the physics of
"light" sources, the physics of double heterostructures LEDs and
the physics of nitride semiconductors. Then we will discuss the development of
epitaxial growth and processing techniques for the best demonstration of UV
LEDs (260—275 nm ) on SiC substrate (4), which was enabled by a novel
thin-film flip-chip process and resulted in higher LED light extraction
efficiency than in UV LEDs grown on planner sapphire or AlN substrates.
Moreover, we will discuss tunnel junction UV LEDs and how they can
significantly improve LED performance and the potential of UV disinfectometry
References:
1. Morawska, & Milton. It is
Time to Address Airborne Transmission of COVID-19 Clinical Infectious Diseases,
71, 9, (2020)
2. Spellberg et al. The
Epidemic of Antibiotic-Resistant Infections: A Call to Action Clinical
Infectious Diseases, 46, 2, (2020)
3. Smith, et al. Global
rise in human infectious disease outbreaks. J. R. Soc. Interface 11,
20140950 (2014).
4. SaifAddin, et
al. AlGaN Deep-Ultraviolet Light-Emitting Diodes Grown on SiC
Substrates. ACS Photonics, 7, 554–561 (2020) https://pubs.acs.org/doi/abs/10.1021/acsphotonics.9b00600
Bio:
Burhan
SaifAddin is an Assistant Professor of Physics KFUPM. He earned his double BSc
degrees in Physics and Electrical Engineering at KFUPM, where he developed an
interest in addressing global energy challenges. After KFUPM, he worked as a
visiting researcher at IBM Research in Almaden to research and develop novel
quantum dot solar cells. In 2011, he earned a Master of Engineering degree at
MIT in Materials Science and Engineering and carried out further research and
studies in solid-state physics and biophysics at Harvard University. In 2018,
he received his Ph.D. in Materials Science and Engineering from the University
of California, Santa Barbara, where he worked at the Solid State Lighting &
Energy Electronics Center (SSLEEC) to explore the physics and device
applications of nitride semiconductors and developed techniques for the growth,
processing, and characterization of deep UV LEDs and visible LEDs.
Subsequently, he worked as a Postdoctoral Fellow at the University of
California, Santa Barbara, where he explored new ways to enhance UV LEDs using
tunnel junction and innovative doping methods. In June 2019, he joined KACST as
an Assistant Professor, where he worked in the Materials Research Institute and
the Energy and Water institute to structure research programs that address KSA
economic needs. In 2020, he co-founded and directed KACST Academy to nurture
and develop globally competitive leaders in research, development, and
innovation (RDI). He also co-founded Ad Astra Therapy. He contributed to
several conferences and co-authored several publications and
licensed patents. He joined KFUPM in August 2021.
All faculty,
researchers and students are invited to attend.
