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Research Seminar of Prof. He Songxian from City University of Hong Kong
Research Seminar of Prof. He Songxian from City University of Hong Kong

 

Lecture Time: 10:00 on 24th March, 2019

Lecture Room: C501 of Science and Innovation Building

Lecture Title:  Semiconductor Nanostructures for High-Performance Electronic and Optoelectronic Devices

He Songxian

City University of Hong Kong

Abstract

Due to the advent of nanotechnology, materials can be readily fabricated into nanoscale configurations with different dimensionalities and widely tunable properties for technological applications. In this presentation, we would summarize and discuss the recent progress in our research group, emphasizing the development of various one-dimensional semiconductor nanowires for high-performance electronics as well as highly-efficient photodetectors. For example, we can fabricate highly-dense and crystalline InxGa1-xSb nanowires on amorphous substrates with enhanced chemical vapor deposition. The obtained nanowires display superior electrical and optoelectronic properties, such as the high hole mobility and broadband ultra-fast photoresponse over the visible and infrared optical communication region. The nanowire device can yield efficient response times down to microseconds along with the high responsivity of 6000 AW-1and excellent external quantum efficiency of 4.8×106% towards 1550 nm regime. Importantly, large-scale nanowire parallel arrayed devices can also be configured to illustrate their practical device integrability for industrial applications.  

 

Biography

 

Dr. Johnny C. Ho received his B.S. degree with high honors in Chemical Engineering, and M.S. and Ph.D. degrees in Materials Science and Engineering from the University of California, Berkeley, in 2002, 2005 and 2009, respectively. From 2009 to 2010, he worked as a post-doctoral researcher in the Nanoscale Synthesis and Characterization group (Materials Science Division) at Lawrence Livermore National Laboratory, California. At present, he is an Associate Professor (with tenure) in the department of Materials Science and Engineering at City University of Hong Kong. Over the years, he has won a number of awards, including Intel Foundation Ph.D. Fellowship (2007-2009), Finalist for the Croucher Innovation Awards (2011), “Future Leaders” selected by the New York Academy of Sciences and Science and Technology in Society Forum (2012), Second Class Award of Shandong Province Science and Technology Prize (2014), President’s Awards (2016) & Outstanding Research Awards (2018), City University of Hong Kong, World Cultural Council (WCC) Special Recognitions Awards, recently elected to be a Founding Member in the Young Academy of Sciences of Hong Kong (2018),etc. His current research interests focus on the synthesis, characterization, integration and device applications of nanoscale materials for various technological utilizations, including electronic, sensor and energy harvesting devices (https://HoCityU.com). He has published over 140 journal articles and 7 book chapters. 



 

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