The Department of Physics and Astronomy invites all to a colloquium featuring Dr. Dong Yu, Department of Physics, University of California at Davis. Dr. Yu will present his talk, “Photocurrent mapping of nanostructures ”, Tuesday, Sept. 20, at 4:10 p.m. in Webster 17.
Meet for refreshments before the lecture at 3:45 – 4:10 p.m. in the foyer on floor G above the lecture hall.
Abstract: Scanning photocurrent microscopy (SPCM) is a powerful experimental tool used to investigate spatially resolved optoelectronic properties of semiconductors and their nanostructures. Raster-scanned laser excitation generates a position-dependent photocurrent map. In the last decade, this technique has been actively used in analyzing semiconductor nanostructures and has provided a range of quantitative information, including minority carrier diffusion length, internal electric field distribution, doping concentration profiles, and photothermal properties in semiconductor nanostructures. This talk will focus on the principles of SPCM analysis and our recent applications of this technique on several nanomaterials including lead sulfide nanowires, vanadium dioxide nanowires, indium arsenide nanowires, and methylammonium lead halide perovskite nanostructures.
