Wednesday, April 23, 2014, 05:15 PM - 06:15 PM
Duncan Hall (DCH), Room 1064
Seminar: 'Engineering Semiconductor Nanowires for Light Sensing and Solar Fuel Applications' by Dr Deli Wang
Engineering Semiconductor Nanowires for Light Sensing and Solar Fuel Applications
Electrical and Computer Engineering, University of California - San Diego
Abstract: "Nanomaterials (nanowire) by Design" allow well-controlled electrical and optical properties and enable enormous opportunities for applications in electronics, optoelectronics, biosensing, and renewable energy. In this talk, I will present our recent research efforts on the fabrication of 3D branched nanowire (b-NW) photoelectrodes for solar fuel generation. The 3D b-NW structure offers a unique pathway to integrate materials with different properties at nanoscale, and enables significant enhancement in device performance in energy harvesting, conversion, and storage. Particularly as photoelectrochemical electrodes, b-NWs offer enhanced light absorption, charge separation/transport, surface redox reaction rate and effective area, fast gas evolution at surface, all are critical to high efficiency solar fuel generation.
Our efforts focus on using earth abundant materials (Si and metal oxides) and low cost fabrication, which offer a potential solution for practical and scalable solar fuel production. A second part of my talk will discuss high sensitivity nanowire photodetectors and the exploration of their potential application for retinal prosthesis. Specifically, I will present the fabrication of Si nanowire photodetectors and using them as artificial photoreceptors to stimulate ganglion neurons under light illumination.
Bio: Deli Wang received his B.S. degree from the University of Science and Technology of China (USTC) in Polymer Chemistry in 1990 and his Ph.D. in Material Science from the University of California at Santa Barbara in 2001 with dissertation on the fabrication of novel biosensors using light emitting conjugate polymers. He then worked as a postdoctoral researcher at Harvard University on semiconductor nanowire-based nanoelectronics. Deli joined the University of California - San Diego in 2004 and now is an associate professor in electrical engineering. His research interests are on optoelectronics, bioelectronics, and renewable energy. Deli has published 65 articles in peer-reviewed scientific journals and has a citation of more than 9,600 times.