Invited Talks
Topic: |
Electronics and Optoelectronics Based on 2D Tellurium/Selenium |
Speaker: |
Chaoliang Tan |
Abstract:
Tellurium (Te) and selenium (Se) are semiconductors with truly one-dimensional crystal structure, where single helical molecular chains are stacked together via van der Waals (vdW) interactions. The naturally terminated surfaces except for the two ends endow Te/Se with advantages over conventional three-dimensional materials, thus making them very promising for fabrication of electronic and optoelectronic devices. In this talk I will present our recent works on electronics and optoelectronics based on 2D Te/Se. Firstly, I will present the fabrication of high-performance short-wave infrared (SWIR) photodetectors and focal plane arrays based on Te nanoflakes and evaporated SexTe1-x thin films with tunable bandgaps. Then, I will present the fabrication of high-performance transistors, logic gates and circuits based on evaporated Te thin films and Te nanobelts grown h-BN. Finally, I will present the fabrication of memory devices based on 2D Te/Se-based vdW heterostructures.
Biography:
Dr. Chaoliang Tan is an Assistant Professor in the Department of Chemistry at City University of Hong Kong, China. He received his Ph.D. from Nanyang Technological University (with Prof. Hua Zhang) in 2016. After working as a Research Fellow in the same group for about one year, he then worked as a Postdoctoral Researcher at the University of California, Berkeley (with Prof. Ali Javey) for two years. His current research is focusing on (1) 2D materials for electronics and optoelectronics, and (2) structural engineering of layered nanomaterials for biomedical applications. He has authored or co-authored over 140 SCI papers. More than 50 of them are first-author or corresponding-author papers, including Nat. Nanotechnol., Nat. Rev. Mater., Nat. Commun., Chem. Rev., Chem. Soc. Rev., J. Am. Chem. Soc., Angew. Chem. Int. Ed., Adv. Mater., ACS Nano, Small, etc. The total citation of his published papers is over 22,400 with a H-index of 66. He has been listed as the “Highly Cited Researcher” (Top 1%, Clarivate Analytics) in last four years (2018-2021) as well as “Top 2% Scientists in the world” in Engineering by Stanford University in last two years (2020-2021). He also received the NSFC Excellent Young Scientist Fund (HK & Macau) in 2021.
Topic: |
Tuning Carrier Mobility and Interface Properties for High-Performance 2D Electronics |
Speaker: |
Ming Yang |
Abstract:
Two-dimensional (2D) semiconductors such as molybdenum disulfide (MoS2) could potentially replace silicon in future electronic devices. However, the low carrier mobility in the 2D MoS2 at room temperature and its inferior interface with high-k dielectrics, remain critical challenges for high-performance electronics. In this talk, we show that by introducing rippled lattice structure in 2D MoS2, a record-high carrier mobility can be achieved at room temperature, due to the increased intrinsic dielectric constant and much suppressed phonon scattering. For the interface between conventional high-k dielectrics and 2D MoS2, we find that hydrogenation is a desired approach to passivate the dangling bonds and improve the interface properties, in which the hydrogenation can selectively occur at high-k dielectrics such as Si3N4 and HfO2, and do not affect the 2D semiconductor MoS2. Finally, we report a data-driven approach to accelerate the development of various promising inorganic molecular crystals as the high-performance high-k dielectrics for 2D MoS2 based electronic devices. These results deepen the understanding of the carrier mobility in 2D semiconductors and their interface with high-k dielectrics, and could be useful for developing a broad range of high-performance 2D electronic and optoelectronic devices.
Biography:
Dr. Ming Yang is Assistant Professor at the Department of Applied Physics, The Hong Kong Polytechnic University (PolyU). Dr. Yang obtained his Ph. D degree from National University of Singapore (NUS) and did the postdoctoral research at NUS as well. He had been working as Scientist at Institute of Materials Research and Engineering, A*STAR, Singapore before joined PolyU. Dr. Yang’s research interest is mainly on using first-principles calculations to understand physical and chemical properties of 2D materials and their device integration problems, complex oxide interface and quantum materials. Dr. Yang has authored/co-authored more than 150 peer-reviewed journal papers (>4700 citation, and H-index 39 as counted in Google Scholar, October 2022), filed 3 PCT patents and contributed one book chapter.
Topic: |
Scalable manufacturing of soft microelectronics: from materials to applications |
Speaker: |
Shiming Zhang |
Abstract:
Bioelectronics research has reached a new level. The emergence of soft electronic technologies enabled a seamless interface between research tools and biological tissues, which was not possible before. Soft electronics allow us to collect biosignals of higher quality at their origin, even under prolonged uses and arbitrary motions. However, scalable manufacturing of soft electronics, especially microelectronics, remains underdeveloped. In this talk, I will introduce materials, devices, and manufacturing principles of soft microelectronics. I will prospect how it can enrich the toolbox of current biomedical technologies to promote translational biomedical innovations, from smart wearables, medical imaging, brain-inspired computing, to human-machine interfaces.
Biography:
Shiming Zhang is currently an Assistant Professor at the University of Hong Kong (HKU), leading the wearable, intelligent, and soft electronics (WISE) research group. He is known for his pioneering contributions in designing and manufacturing tissue-like soft organic bioelectronics, such as organic electrochemical transistors (OECTs). He conceptualized and fabricated the world’s first OECTs-based stretchable microelectrode arrays. His lab developed and commercialized the “PERfECT” readout system, which is so far the smallest (coin-sized) and lightest (0.4 grams) analytical control unit for wireless and wearable characterizations of low-voltage transistors.
Topic: |
Spintronics devices for ultralow-power semiconductors and unconventional computers |
Speaker: |
Shunsuke Fukami |
Abstract:
Spintronics utilizes electric and magnetic properties of electrons simultaneously, exploring various technologies that are useful to realize ultralow-power semiconductors and unconventional computers. This presentation shows recent studies of nanoscale spintronics devices and discuss their potential to contribute to these goals. Nonvolatile spintronics devices that drastically reduce the required power for information processing at the edge and probabilistic spintronics devices that constitute quasi-quantum computers executing computationally hard problems at room temperature are presented.
Biography:
Shunsuke Fukami is a Professor and Distinguished Researcher of the Tohoku University, Japan. He received his Master degree in 2005 and Doctor degree in 2012 from Nagoya University. He joined NEC Corporation in 2005, and moved to Tohoku University in 2011. He received a number of awards for his research, including the JSAP Young Scientist Presentation Award in 2014, the Young Scientists’ Prize of Science and Technology by the Ministry of Education, Culture, Sports, Science and Technology (MEXT) in 2015, the Young Researchers Award of the Asian Union of Magnetics Societies in 2018, the JSAP Outstanding Paper Award in 2019, and the Achievement Award of the Magnetics Society of Japan in 2022. His areas of expertise include spintronics physics/materials/devices and their application to integrated circuits and novel-computing hardware.
Topic: |
Bioinspired in-sensor computing |
Speaker: |
Yang Chai |
Abstract:
The number of sensor nodes in the Internet of Things is growing rapidly, leading to a large volume of data generated at sensory terminals. Frequent data transfer between the sensors and computing units causes severe limitations on the system performance in terms of energy efficiency, speed, and security. To efficiently process a substantial amount of sensory data, a novel computation paradigm that can integrate computing functions into sensor networks should be developed. The in-sensor computing paradigm reduces data transfer and also decreases the high computing complexity by processing data locally. In this talk, we will discuss the hardware implementation of the in-sensor computing paradigm at the device and array levels. The physical mechanisms that lead to unique sensory response characteristics and their corresponding computing functions are illustrated. In particular, bioinspired device characteristics enable the implementation of the functionalities of neuromorphic computation. The integration technology is also discussed and the perspective on the future development of in-sensor computing is provided.
Biography:
Dr. Yang Chai is the Associate Dean of Faculty of Science of the Hong Kong Polytechnic University, Vice President of Physical Society of Hong Kong, a member of The Hong Kong Young Academy of Sciences, an IEEE Distinguished Lecturer since 2016, and was the Chair of IEEE ED/SSC Hong Kong Chapter (2017-2019). He is a recipient of RGC Early Career Award in 2014, the Semiconductor Science and Technology Early Career Research Award in 2017, PolyU FAST Faculty Award in Research and Scholar Activities in 2018/2019, Young Scientist Award of ICON-2DMAT in 2019, PolyU President’s Award in Research and Scholar Activities in 2019/2020, NR45 Young Innovators Award in 2021, and Young Scientist of World Laureate Forum in 2021. His current research interest mainly focuses on emerging electronic devices.
Topic: |
Advanced Thin-film Lithium Niobate Devices for Next-Generation Wireless Communications |
Speaker: |
Yansong Yang |
Abstract:
Piezoelectric acoustic devices are irreplaceable in mobile wireless communications given their fundamental advantages cannot be fully delivered by any other technologies. Their performance directly determines the communication mode, signal strength, data rate, and other critical performance of mobile devices. As modern communication standards evolve toward higher frequencies and wider bandwidth for higher data rate applications, a new class of piezoelectric acoustic devices covering an unprecedented wide frequency range with more efficient transduction is sought after. This talk will introduce a series of advanced piezoelectric acoustic platforms based on Lithium niobate thin films which can be either solidly mounted on carrier substrates or suspended to cover frequency bands from GHz to mmWave.
Biography:
Yansong YANG is currently an Assistant Professor in the Department of Electrical and Computer Engineering at The Hong Kong University of Science and Technology. He has won the 2nd Place in Best Paper Competition at the 2018 IEEE International Microwave Symposium, and the best paper award at 2019 IEEE International Ultrasonics Symposium. He was also a finalist for the Best Paper Award at 2018 IEEE International Frequency Control Symposium and the Advanced Practices Paper Competition Award at 2020 IEEE International Microwave Symposium. He is also a recipient of the 2019 P. D. Coleman Graduate Research Award from the Department of Electrical and Computer Engineering at UIUC, and the 2022 Microwave Prize from the IEEE Microwave Theory and Techniques Society. He currently serves as the chair of the IEEE Hong Kong Electron Device/Solid-State Circuits Joint Chapter.
Topic: |
The Emergence of Perovskite Semiconductors |
Speaker: |
Yuanyuan Zhou |
Abstract:
Metal halide perovskites are a new class of semiconductors that can be processed using solution printing at near ambient temperatures, and they have demonstrated extraordinary potential for applications to a range of functional electronics including photovoltaics. This talk will present a brief introduction to perovskite semiconductors from the perspective of materials science. Then, the discussion will be centred at the thin-film microstructure of perovskite semiconductors regarding its evolution, characterization, and prominent effects on the device performance. Unconventional behaviour and properties of perovskites will be illustrated, unleashing the promise of these materials over conventional semiconductors in view of scalable manufacturing. While photovoltaic devices will be mostly used for demonstrating the perovskite semiconductor sciences, the overarching impacts may be seen on the development of next-generation semiconductor devices of various types.
Biography:
Dr. Yuanyuan Zhou is Assistant Professor of Physics and Principal Investigator of ΣLab (www.alvinyzhou.com) at Hong Kong Baptist University. Dr. Zhou has published 116 journal papers and co-filed 7 international patents (2 officially issued). As the corresponding, first or co-first author, he published more than 40 papers on the top-tier journals of his field, including 1 in Nature Energy, 4 in Nature Communications and 11 in CellPress flagship journals (Joule/Chem/Matter). His Google Scholar shows near 10000 citations and 51 h-index. He served as Invited Guest Editor of a range of reputable international journals, including Advanced Energy Materials and Matter (CellPress), and He is Section Editor of Journal of Energy Chemistry (Honoured the Best Editorial Member Award). Dr. Zhou received numerous honours and awards, including NSFC Excellent Young Scientists Fund (Hong Kong and Macau), HKBU Presidential Early-Career Researcher Award, China Rising Star in Science and Technology (selection advised by China Association for Science and Technology), United States National Science Foundation EPSCoR Research Fellow. Based on his research impact, Dr. Zhou has been named the World Top 2% Scientists listed by Stanford University and Elsevier in 2022, 2021, 2020, and 2019.
Topic: |
High-Performance Triboelectric Nanogenerator and Tribophotonics |
Speaker: |
Yunlong Zi |
Abstract:
As the development of the Internet of Things (IoT), trillions of widely-distributed devices are integrated for health monitoring, biomedical sensing, environmental protection, infrastructure monitoring, and security, which require power supplies. To provide a sustainable power solution, triboelectric nanogenerator (TENG) has been developed since 2012 for high-efficiency mechanical energy harvesting from the ambient environment. The PI’s team has made significant contributions to fundamental studies about the triboelectric effect, discharge, and TENG output characteristics. and Multiple strategies to greatly enhance the output performance of TENG has been demonstrated, such as the high-pressure environment and the liquid-solid interface. On the other hand, the PI’s team also proposed and developed the concept of tribophotonics: tribo-charge induced tuning or generation of photons toward self-powered wireless sensing, which can be achieved through tunable liquid lens, liquid crystal, optical switch, tribo-induced electroluminescence (TIEL), and discharge. These studies will drive the further development of TENG technology for broad applications in blue energy harvesting, the IoT, human-machine interface, health & infrastructure monitoring, wearable & implantable electronics, towards high-efficiency self-powered systems.
Biography:
Prof. Yunlong Zi is an Associate Professor in Thrust of Sustainable Energy and Environment in Hong Kong University of Science and Technology – Guangzhou (HKUST-GZ). Dr. Zi received his Ph.D. in Physics from Purdue University in 2014; his Bachelor of Engineering in Materials Science and Engineering from Tsinghua University in 2009. Before joining HKUST, he worked as an Assistant Professor at the Chinese University of Hong Kong during 2017-2022, and a Postdoctoral Fellow at Georgia Institute of Technology during 2014-2017. His current research interests mainly focus on high-efficiency mechanical energy harvesting through triboelectric nanogenerators (TENG), triboelectric effect, discharge, TENG triggered high-voltage applications, and self-powered systems. As the 1st and corresponding authors, his research studies have been published in top-notch journals, including Nature Nanotechnology, Nature Communications, Science Advances, Advanced Materials, Nano Letters, ACS Nano, Nano Energy, and etc. He was honored as Nano Energy Award winner 2021; Fellow of International Association of Advanced Materials (FIAAM) 2021; Vebleo Fellow 2021; MRS Postdoctoral Award winner 2017; Emerging Investigator by Journal of Materials Chemistry C in 2018; MINE Young Investigator Finalist in 2018; and one of “5 students who are transformation makers” as highlighted in Purdue homepage in 2013.
Topic: |
Development of diamond materials for quantum sensing and beyond |
Speaker: |
Zhiqin Chu |
Abstract:
The diamond has been well known as the gem stones in jewellery market, and the same material with various atomic defects, i.e., color centers in diamond lattice, shows unique quantum behaviors even at ambient conditions. A diamond, not just the best friend of ladies, but also the best friend of scientists. Due to their unique quantum properties, these atomic defects has been demonstrated to achieve nanometric measurement of various physical quantities such as electromagnetic fields, temperature and etc. with unprecedented precision. Here, I will briefly introduce the diamond-based quantum science and technology, and its huge potential in diverse fields. Specifically, I will highlight our development of high figure-of-merit diamond materials towards quantum sensing in single living cells. In addition, I will also share my journey in exploring other directions, e.g., diamond metasurfaces, diamond semiconductors and etc.
Biography:
Dr. Zhiqin Chu received his PhD degree in Physics from The Chinese University of Hong Kong in July 2012. Dr. Chu carried out his postdoctoral training (2014/04-2016/09) at The University of Stuttgart (Germany), and then worked as a Research Assistant Professor (2016/10-2018/10) in Department of Physics at The Chinese University of Hong Kong. Since November 2018, Dr. Chu has been an Assistant Professor in Department of Electrical and Electronic Engineering (Joint Appointment with School of Biomedical Sciences), and established the Precision Biosensing & Biophysics (PBB) Laboratory at The University of Hong Kong. Dr. Chu’s current research interests include Diamond defects, Quantum sensing, Biophysics, Nanophotonics and Biointerface.