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Abstract: Infectious diseases and water are some of the greatest, most urgent challenges of the 21st century. III-nitride ultraviolet (UV) light sources, including light-emitting diodes (LEDs) and lasers, are the only alternative technology to replace conventional power-hungry, hazardous mercury lamps for disinfection and water purification. Recent studies showed that AlGaN-based UV-C LEDs can readily shred genetic material of viruses and bacterial and achieve 99.9% sterilization of SARS-COV-2. In this talk, I will present the recent advances of AlGaN and BN nanostructures and heterostructures and their applications in UV optoelectronics, including the first demonstration of mid and deep UV laser diodes and tunnel junction UV-C LEDs with significantly improved performance. The recent development of far-UV-C LEDs, in the wavelength range of 207-222 nm, will also be presented, which has shown to be faster and far more effective than traditional UV-C light (~265 nm) in preventing the transmission of microbial diseases, while causing virtually no harm to mammalian skin or eye.
Speaker Bio: Dr. Zetian Mi's group is focused on the investigation of semiconductor nanostructures and their application in electronic, photonic, and solar energy devices and systems. His primary research areas include: Epitaxial growth and fundamental properties of semiconductor nanostructures, including quantum dots, nanowires, and two-dimensional atomic crystals; III-nitride materials and devices; Light emitting diodes, lasers, and Si photonics; Artificial photosynthesis, solar fuels and solar cells; III-nitride and diamond based electronic devices.