Prof. Judy Wu
Department of Physics, University of Kansas
地点：唐仲英楼B305
时间：2019-06-13 16:00
Semiconductor nanocrystal/graphene van der Waals (vdW) heterojunctions provide a unique scheme that combines the strong quantum confinement of the semiconductor nanocrystals with superior charge mobility of graphene for extraordinary responsivity to lights, strain, chemical and moleculer analyte. Fabrication of such vdW heterostructures can be achieved by printing colloidal semiconductor nanocrystals on graphene with pre-defined electrodes on larger wafers, allowing chip-scale generation of felxible, wareable and self-powered devices. This talk will discuss several vdW heterostructures we have developed recently including 1) flexible, narrow-band perovskite/graphene ultraviolet photodetectors with superior stability and detectivity; 2) broadband (UV–Vis–NIR)photodetectors FeS2/graphenewith photoresponsivity in exceeding 106 A/Wviastimulating a strong localized surface plasmonic resonance (LSPR) in FeS2 nanocrystals; 3) piezoelectric ZnO/graphene strain sensors with ultrafast response enabled by piezoelectric gating of graphen; and 4) plasmonic LSPR MoS2nanodiscs/graphene for surface enhanced Raman spectroscopy of biomolecules of sensitivity up to 10-12 M. These model systems demonstrate the viability of the vdW heterostructures for high-performance optoelectronics withlow-cost, flexiblity,and scalability.
Dr. Judy Wu is a Distinguished Professor of Physics at the University of Kansas (KU). She is an experimental condensed matter physicist and specialized in thin films and nanostructures in synthesis, characterization and device applications. Her current research focus is on understanding and manipulating interfaces at atomic scales for device applications inphotodetectors,bio/chem/strain-sensors, solar cells, lithium ion batteries, Josephson tunnel junctions, magnetic tunnel junctions, etc. She has authored/coauthored more than 270 scientific publications and12 book chapters/topic reviews. She has been awarded 12 US patents, plus 12 pending patent applications. She has also given >170 invited talks/seminars at international/national/regional conferences/workshops. Dr. Judy Wu was elected to the Board of Directors for Applied Superconductivity Conferencein 2002 and has served/chaired Technical committee and lead editor for many years. She is currentlyon Executive Board and the North American Editor for IOP (UK)Superconductor Science and technology. She has been co-chairing the Material Task Force on US senator Pat Roberts’ advisory committee for Science, Technology and Future of Kansas. Dr. Wu has served on many review panels for US DOE, NSF and DOD research programs and has organized/chaired numerous symposia/technical sessions for various national and international conferences including American Physical Society, Material Research Society, American Chemical Society, American Ceramic Society, Applied Superconductivity conference, etc.