报告标题：“Binary Materials” for Photodetection from Mid-Infrared, Visible, to X-ray
报告人： Tom Wu (吴韬)School of Materials Science and Engineering, University of New South Wales (UNSW),Sydney, NSW 2052, Australia
时间：4月26日下午2点
地点：田家炳楼南楼203
邀请人：董帅
Light-matter interaction is a long-lasting theme in condensed matter physics and optoelectronics. Light detection in different wavelength regimes is the foundation of a wide range of sensing, imaging, medical and surveillance technologies. In this talk I will discuss the use of transition-metal oxides, hybrid organo-metal perovskites and other nanomaterials in “binary” mixed-dimensional heterostructures with proper bandgaps and architectures to detect photons with different wavelengths. First, for visible light detection, we demonstrate that combining 3D hybrid perovskites with high-mobility 1D carbon nanotubes or 2D two-dimensional metal dichalcogenides significantly enhances charge transport and device performance [1,2]. Second, we report a mid-infrared (up to 10 um) mixed-dimensional photodetector enabled via coupling graphene with a narrow bandgap semiconductor Ti2O3 [3]. Finally, using epitaxial ferroelectric/semiconductor oxide junctions with a current-perpendicular-to-plane geometry, we achieve a new type of X-ray detector with colossal persistent X-ray-induced photoconductivity [4].
1. F. Li, et al., Advanced Materials, 2017, 29, 1602432.
2. C. Ma, et al., Advanced Materials, 2016, 28, 3683.
3. X. Yu, et al., Nature Communications, 2018, 9, 4299.
4. W. J. Hu, et al., Advanced Functional Materials, 2018, 28, 1704337.
Dr. Tom Wu (吴韬) is a professor in the School of Materials Science and Engineering at University of New South Wales (UNSW) in Sydney, hired through the Strategic Hires and Retention Pathways (SHARP) scheme. He received his B.S. degree from Zhejiang University in 1995 and Ph.D. degree from the University of Maryland, College Park in 2002. Before joining UNSW, Dr. Wu worked as postdoc in Argonne National Laboratory in Chicago, assistant professor in Nanyang Technological University (NTU) Singapore, and associate professor in King Abdullah University of Science and Technology (KAUST). Dr. Wu has authored 240 peer-reviewed papers with citations of more than 12,000 and a H-index of 63. His research explores oxide thin films, nanomaterials, and hybrid perovskites, with a focus on their electronic, magnetic and optical functionalities. His group has witnessed the career development of 18 PhD students and 29 postdocs. He also serves as an Associate Editor for ACS Applied Materials & Interfaces.