Presenter: Dr. Liujiang Zhou (University of Bremen)
Topic: Computational Modeling on Optical, Electrochemical, Topological Properties of Low Dimension Materials
Time: 10:00 AM, Aug. 3rd (Wed.)
Location: Conference Room B, BLDG 909-1F
Abstract
Two-dimensional (2D) materials (such as graphene, transition-metal dichalcogenides, phosphorene) hold great promise in future nanodevice applications in high-speed electronic and optical devices, energy generation and storage, chemical sensors, even biomedical detection, photocatalysis, have all been explored. Based on ab inito calculation, we systematically investigated graphene and other novel 2D novel layered materials’s application in solar cell, lithium ion batteries and topological insulators: 1) Novel donor materials and heterostructures in excitionic solar cell, including SiC2 and SiC7 siligraphene, phosphorene-TiO2 were predicted. Related figure of merits in these systems were investigated, such as band alignment, charge transfer, absorbed photon flux, carrier dynamics, power conversion efficiencies. 2) The adsorption of a Li adatom on defect-free graphene is unfavorable. Our studies showed that the origin for the higher capacities of Li storage of graphene could be ascribed to point defects, grain boundary, heteroatom doping. 3) Topological insulators (TIs) are promising for achieving dissipationless transport devices due to the robust gapless states inside the insulating bulk gap. Seeking for desirable QSH insulators with high feasibility of experimental preparation and large nontrivial gap is of great importance for wide applications in spintronics. A series of 2D Topological insulators (TIs) based on 2D transition-metal halides and carbides, including MX (M = Zr, Hf; X = Cl, Br, and I), MC (M=Ti, Zr, Hf), TaCX (X = Cl, Br, I), H-MoS2, etc. Our effort has led to a new paradigm in developing 2D materials in the field of energy conversion and storage and spintronics.
Biography
Dr. Liujiang Zhou is currently a postdoctoral research assistant in Bremen Center for Computational Materials Science (BCCMS) at University of Bremen, Germany. He obtained his PhD in 2014 from University of Chinese Academy of Sciences (CAS), China. He joined BCCMS in Oct., 2014 and has constructed close collaboration with computational and experimental scientists at Max Planck Institute for the Physics of Complex Systems (Germany), Los Alamos National Lab (USA), Queensland University of Technology (Australia) and Institute of Physics (China), Fujian Institute of Research of Matter and Structure (China). His current research interests lie at optoelectronic materials and nonlinear optical crystals, topological insulators, low-dimentional materials and Interfaces, as well as clean energy materials (Li-ion Batteries, Solar Cells, photocatalysis etc.) He received National Scholarship Award in 2012 and Outstanding Graduates Award of University of CAS in 2014. Many papers were published in Nano Lett., J. Am. Chem. Soc., 2D Materials, Chem. Mater., Nanoscale, J. Phys. Chem. Lett. and so on. He was one of the peer reviewers for Nano Lett., Nanoscale, J. Phys. Chem. Lett. J. Phys. Chem. C, etc. As of 08/2016, the total number of publications is 40, cited 630 times according to Web of Science and 812 according to Google Scholar as of 08/2016. H-index:16.
Contact: Prof. Youyong Li
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