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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 


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)


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.


14 Feb 2022


11:00 AM to 12:00 PM