Singh Seminar Series: Wei-Yu Long and Lauren Klein-Juneau
About this Event
Anisotropic Electrical Transport in Graphene Field-Effect Transistor Modulated by Sub-micron Gold Gratings
Speaker: Wei-Yu Long
Abstract: This presentation explores the anisotropic electrical transport in graphene field-effect transistors (GFETs) modulated via non-destructive surface charge transfer doping (SCTD). By integrating periodic sub-micron gold gratings beneath CVD-grown monolayer graphene, we successfully induced 1D periodic potential barriers. Kelvin Probe Force Microscopy (KPFM) confirmed a distinct 120 meV potential step between the alternating graphene-on-gold and graphene-on-SiO2 regions. Electrical measurements revealed strong macroscopic transport anisotropy: while parallel transport benefits from globally enhanced p-type doping, perpendicular transport is significantly hindered by periodic interfacial scattering. By systematically varying the grating line widths, we established a multiple-barrier physical model to quantitatively extract a characteristic barrier resistance, which is attributed to quantum mode mismatch at the p/p+ junctions. This work provides a highly precise, low-damage nanofabrication framework to control the electrical behaviors of 2D materials for advanced nanoelectronic applications.
About the Speaker: Wei-Yu Long: received the B.S. degree in Department of Electrical Engineering, National Taiwan University and is currently pursuing the Ph.D. degree in program for semiconductor devices, materials, and hetero-integration at Graduate School of Advanced Technology from National Taiwan University, Taipei, Taiwan. His research interests include graphene-based device fabrication, solid-state electronics, and the application of nano-structure photodetector.
Documenting Until It is Done: NexusLIMS and You
Speaker: Lauren Klein-Juneau
Abstract: Documentation and record keeping are essential at all levels of research and scientific work. NexusLIMS is a platform which easily allows users to find and track their recent data. This talk will discuss the NexusLIMS data management system for users of NCF tools, highlighting its ease of use and benefits for NCF users.
About the Speaker: Lauren Klein-Juneau is the newest staff member at Singh Center, joining after a decade of work in the semiconductor industry, specializing in the characterization of ALD and CVD precursor molecules and process gases. She is very excited for her inaugural seminar talk!
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