Department of Applied Physics, The Hong Kong Polytechnic University
In this talk, we will first demonstrate multifunctional supercapacitor devices - solar-powered photovoltachromic supercapacitors (PVCSs) by vertically integrating a perovskite solar cell (PSC) with MoO3/Au/MoO3 transparent electrode and electrochromic supercapacitor into one device. These PVCSs provide a seamless integration of energy harvesting/storage device, automatic and wide color tunability and enhanced photo-stability of PSCs. The color states of PVCSs not only indicate the amount of energy stored and energy consumed in real time, but also enhance the photo-stability of photovoltaic component by preventing its long-time photo-exposure under fully charged state of PVCSs. This work designs a new type PVCS for multifunctional smart window applications commonly made of glass.
Neuromorphic visual systems have considerable potential to emulate basic functions of the human visual system even beyond the visible light region. However, the complex circuitry of artificial visual systems based on conventional image sensors, memory and processing units presents serious challenges in terms of device integration and power consumption. Here we show simple two-terminal MoO3 optoelectronic resistive random access memory (ORRAM) synaptic devices for an efficient neuromorphic visual system that exhibit non-volatile optical resistive switching and light-tunable synaptic behaviours. The ORRAM arrays enable image sensing and memory functions as well as neuromorphic visual pre-processing with an improved processing efficiency and image recognition rate in the subsequent processing tasks. The proof-of-concept device provides the potential to simplify the circuitry of a neuromorphic visual system and contribute to the development of applications in edge computing and the internet of things.
 ACS Nano, 2016, 10(6), 5900-5908.
 Nature Nanotechnology, 2019, 14, 776-782.
Dr. Yang Chai is an Associate Professor at the Hong Kong Polytechnic University. He is the vice president of Physical Society of Hong Kong, and the Chair of IEEE ED/SSC Hong Kong Chapter. He joined the Department of Applied Physics in the Hong Kong Polytechnic University in 2012. He is a recipient of RGC Early Career Award in 2014, the IEEE Distinguished Lecturer since 2016, and the Semiconductor Science and Technology Early Career Research Award in 2017. His current research interest includes low-dimensional material for electron devices.
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