Talk Abstracts

IEEE EDS Seattle Chapter 2013 Mini-Colloquium

Talk abstracts and speaker biographies appear below.

A Green Campus and Photovoltaic Research

Paul K. L. Yu1, Edward T. Yu2, Deli Wang1 and Byron Washom1
1Dept. of ECE, U.C. San Diego, La Jolla, CA 92093-0407, USA
2Microelectronics Res. Ctr., U.T. Austin, Austin, TX 78758, USA

Abstract. In this presentation we give an overview of the various campus wide "Green" projects at the University of California, San Diego. These projects aim at higher energy saving and efficiency. These involve PV panel installation, green building design, solar forecasting, and biofuel investigation using algae. Then we discuss the concept and demonstration of novel photovoltaic and photo-electrochemical cells research based on various semiconductor nanostructures, specifically compound semiconductor quantum wells and nanowires, and the use of plasmonic and related scattering effects from metal or dielectric nanoparticles to increase efficiency of optical absorption. In particular, vertical nanowire arrays were engineered to optimize optical confinement within the nanowires, and core-shell heterostructures were employed to achieve broad-spectrum absorption while maintaining high open-circuit voltages. Branched nanowire photo-electrochemical cells were also made and characterized for their spectral incident photon-to-current conversion efficiency.

Paul K. L. Yu is presently the William S. C. Chang Endowed Chair Distinguished Professor at the Electrical and Computer Engineering Department, and the Associate Vice Chancellor for Research Initiatives at the University of California, San Diego (UCSD). At UCSD, he conducts research on semiconductor materials and devices for various photonics and microwave photonics applications. His current research projects include high-power optical detectors and modulator devices for analog fiber-links, and high linearity GaN/InGaN varactor and high power RF switches for wireless communications. His recent work includes novel designs using quantum wells and nanowire/polymer hybrid photodiode with potential for solar cells. He serves as the President of IEEE Electron Devices Society in 2012-2013. He is an elected Fellow of IEEE, AAAS, OSA and SPIE. He has published more than 140 papers in the area of photonics. He received a Ph.D. in Applied Physics from Caltech in 1983.

Solution-Processed Quantum Dot Photodetectors

Lih Y. Lin
Dept. of Electrical Engineering, University of Washington, Seattle, WA 98195-2500, USA

Abstract. Semiconductor quantum dots (QDs) have emerged as an area of intense research due to their superior optoelectronic performance than the corresponding bulk materials, such as high quantum efficiency, size-dependent tunable emission, and high sensitivity. In addition, colloidal QDs have flexible surface chemistry that can be modified with various capping molecules. This leads to vast diversity in fabrication, integration and delivery methods. Given the high optoelectronic properties and solution-process nature, colloidal QDs are excellent materials for achieving high-quality photonic devices through inkjet printing, spin-coating or drop-casting. At the same time, utilizing localized surface plasmon resonance arising from interaction between light and metal nanostructures to enhance and concentrate light of specified wavelength range has attracted much attention for various applications. Plasmonic metal nanoparticles (NPs) in solution are therefore ideally suited for integration with colloidal QDs to achieve enhanced QD photosensors through solution processing. In this presentation, we will describe our work on nanogap QD photodetectors with high sensitivity and spatial resolution. We will also discuss integrating QD photodetectors with plasmonic metal NPs to achieve enhanced responsivity.

Lih Y. Lin received Ph.D. degree in Electrical Engineering from UCLA in 1996 with highest honor of Outstanding Doctor of Philosophy from School of Engineering and Applied Science. She joined AT&T Labs-Research as a Senior Technical Staff Member in 1996, and Tellium, Inc. as Director of Optical Technologies in 2000. She has been with the Electrical Engineering Department of University of Washington since 2003, where she is now a Professor. Her current research interest is quantum dot and plasmonics nanophotonics, optical MEMS for bio-instrumentation, and nanostructure-enhanced laser tweezers. She has over 65 journal papers, over 140 conference publications, 4 book chapters, and holds 30 US patents. Dr. Lin has served as chair, co-chair and technical program committee member of various technical conferences, and as guest editors for IEEE Journal of Selected Topics in Quantum Electronics, IEEE Journal of Quantum Electronics and Journal of Lightwave Technology. Dr. Lin was a recipient of the MIT Technology Review Award and a finalist of IEEE Eta Kappa Nu Outstanding Young Electrical Engineer Award. She is a Fellow of IEEE and a member of OSA.

High-Frequency Characteristics of 1-D Nanostructures

Cary Y. Yang
Santa Clara University, Santa Clara, CA, USA

Abstract.A method to extract compact circuit models for one-dimensional nanostructures from measured high-frequency characteristics is described. We demonstrate that a frequency-independent parallel RC circuit is the simplest model that accurately describes high-frequency electrical conduction in carbon nanofibers (CNFs). The resistance is determined from dc measurement and the capacitance is extracted directly from measured S-parameters for a ground-signal-ground test structure, without using any fitting parameter. The results obtained from the circuit model for CNF test devices are within ± 0.5 dB and ± 5° of measured S-parameters up to 50 GHz. The model is further justified by examining the relationship between S and Y-parameters of the test network. Further, we determine that the accuracy of the model is critically dependent on the contact impedance at the CNF-metal electrode interface.

Cary Y. Yang received the B.S., M.S., and Ph.D. degrees in electrical engineering from the University of Pennsylvania. He spent a year at M.I.T. as a postdoctoral fellow working on electronic properties of chemisorbed molecules on heavy transition metal surfaces. He continued his research on surface and interface science at NASA Ames Research Center and Stanford, before founding Surface Analytic Research, a Silicon Valley company focusing on sponsored research projects covering various applications of surfaces and nanostructures. He joined Santa Clara University in 1983 and is currently Professor of Electrical Engineering and Founding Director of TENT Laboratory. At Santa Clara, he served as Chair of Electrical Engineering, Associate Dean of Engineering, and Founding Director of Center for Nanostructures. His research spans from silicon-based nanoelectronics to nanostructure interfaces in electronic, biological, energy-storage systems. He is a Fellow of IEEE, former editor of IEEE Transactions on Electron Devices, past president of IEEE Electron Devices Society, and past elected member of the IEEE Board of Directors. He was the recipient of the 2004 IEEE Educational Activities Board Meritorious Achievement Award in Continuing Education "for extensive and innovative contributions to the continuing education of working professionals in the field of micro/nanoelectronics." He received the IEEE Electron Devices Society Distinguished Service Award in 2005.

Complementary Bioprotonic FETs with Acid and Base Dopants

Marco Rolandi
Dept. of Materials Science and Engineering, University of Washington, Seattle, WA 98195, USA

Abstract. The quest for smaller and faster computing has focused on controlling the flow of electrons and holes in nanoscale molecular structures. In living systems, protonic and ionic currents are the basis for all information processing. As such, artificial devices based on protonic and ionic currents offer an exciting opportunity for bionanoelectronics. Proton transport in nature is important for ATP oxidative phosphorylation, the HCVN1 voltage gated proton channel, light activated proton pumping in bacteriorhodopsin, and the proton conducting single water file of the antibiotic gramicidin. In these systems, protons move along hydrogen bond networks formed by water and the hydrated biomolecules (proton wires). Along these wires, protons hop according to the Grotthuss mechanism. Here, I will draw an analogy between the Grotthuss proton transport and electronic semi conductivity. Acids are described as H+ donors and bases are described as H+ acceptors. These functional groups yield H+ and OH- (proton hole) conducting devices in parallel with n-type and p-type electronic semiconductors. Results from complementary H+-FETs will be discussed in light of this description. In turn, insights from these devices may be used to see proton transport in biological systems from an alternate perspective.

Marco Rolandi, Ph. D., is an Assistant Professor of Materials Science and Engineering at the University of Washington (2008). He received his Ph. D. in Applied Physics from Stanford University (2005) working with Prof. Hongjie Dai and his postdoctoral training at the University of California, Berkeley (2008) working with Prof. Jean M. J. Fréchet. His research focuses on micro- and nano biological and bionspired structures and their integration in biocompatible devices. His work on bionanoprotonic transistors has been highlighted in the New York Times, the New Scientist, EnGadget, Popular Science, MRS 360, IEEE Spectrum, Materials Views, and over 100 other sites. He was nominated TR-35 GI (one of the top Italian innovators under 35) by the MIT Technology Review (Italy). He was the recipient of an NSF-CAREER award in 2012 and a 3M Nontenured Faculty award in 2010.

Recent Development on Electrostatic Discharge (ESD) Protection of RF Integrated Circuits

Juin J. Liu
Pegasus Distinguished Professor, University of Central Florida, Orlando, FL, USA
Chang Jiang Scholar Endowed Professor, Ministry of Education, China

Abstract. Electrostatic discharge (ESD) is one of the most prevalent threats to electronic components. It is an event in which a finite amount of charge is transferred from one object (i.e., human body) to the other (i.e., microchip). This process can result in a very high current passing through the microchip within a very short period of time, and more than 35% of chip damages can be attributed to such an event. As such, designing on-chip ESD structures to protect integrated circuits against the ESD stress is a high priority in the semiconductor industry. The continuing scaling of CMOS technology makes the ESD-induced failures even more prominent, and one can predict with certainty that the availability of effective and robust ESD protection solutions will become a critical and essential component to the successful advancement and commercialization of the next-generation CMOS-based electronics.

An overview on the ESD sources, models, protection schemes, and testing will first be given in this talk. This is followed by presenting the recent development and advancement in ESD protection solutions for modern and future RF integrated circuits.

Juin J. Liou received the B.S. (honors), M.S., and Ph.D. degrees in electrical engineering from the University of Florida, Gainesville, in 1982, 1983, and 1987, respectively. In 1987, he joined the Department of Electrical and Computer Engineering at the University of Central Florida (UCF), Orlando, Florida where he is now the Pegasus Distinguished Professor and UCF-Analog Devices Fellow. His current research interests are Micro/nanoelectronics computer-aided design, RF device modeling and simulation, and electrostatic discharge (ESD) protection design and simulation.

Dr. Liou holds 8 U.S. patents (3 more filed and pending), and has published 9 books, more than 250 journal papers (including 17 invited review articles), and more than 200 papers (including 84 keynote and invited papers) in international and national conference proceedings. He has been awarded more than $11.0 million of research contracts and grants from federal agencies (i.e., NSF, DARPA, Navy, Air Force, NASA, NIST), state government, and industry (i.e., Semiconductor Research Corp., Intel Corp., Intersil Corp., Lucent Technologies, Alcatel Space, Conexant Systems, Texas Instruments, Fairchild Semiconductor, National Semiconductor, Analog Devices, Maxim, RF Micro Device, Lockheed Martin), and has held consulting positions with research laboratories and companies in the United States, China, Japan, Taiwan, and Singapore. In addition, Dr. Liou has served as a technical reviewer for various journals and publishers, general chair or technical program chair for a large number of international conferences, regional editor (in USA, Canada and South America) of the Microelectronics Reliability journal, and guest editor of 3 special issues in Microelectronics Reliability and Solid-State Electronics.

Dr. Liou received ten different awards on excellence in teaching and research from the University of Central Florida (UCF) and six different awards from the IEEE. Among them, he was awarded the UCF Pegasus Distinguished Professor (2009) – the highest honor bestowed to a faculty member at UCF, UCF Distinguished Researcher Award (four times: 1992, 1998, 2002, 2009) – the most of any faculty in the history of UCF, UCF Research Incentive Award (three times: 2000, 2005, 2010), UCF Trustee Chair Professor (2002), and IEEE Joseph M. Biedenbach Outstanding Engineering Educator Award in 2004 for his exemplary teaching, research, and international collaboration. His other honors are Fellow of IEEE, Fellow of IET, Fellow of Singapore Institute of Manufacturing Technology, Fellow of UCF-Analog Devices, Distinguished Lecturer of IEEE Electron Device Society (EDS), and Distinguished Lecturer of National Science Council. He holds several honorary professorships, including Chang Jiang Scholar Endowed Professor of Ministry of Education, China - the highest honorary professorship in China, NSVL Distinguished Professor of National Semiconductor Corp., USA, International Honorary Chair Professor, National Taipei University of Technology, Taiwan, Chang Gung Endowed Professor of Chang Gung University, Taiwan, Feng Chia Chair Professor of Feng Chia University, Taiwan, Chunhui Eminent Scholar of Peking University, China, Cao Guang-Biao Endowed Professor of Zhejiang University, China, Honorary Professor of Xidian University, China, Consultant Professor of Huazhong University of Science and Technology, China, and Courtesy Professor of Shanghai Jiao Tong University, China. Dr. Liou was a recipient of U.S. Air Force Fellowship Award and National University Singapore Fellowship Award.

Dr. Liou has served as the IEEE EDS Vice-President of Regions/Chapters, IEEE EDS Treasurer, IEEE EDS Finance Committee Chair, Member of IEEE EDS Board of Governors, and Member of IEEE EDS Educational Activities Committee.

Optoelectronics of 2D Layered Materials

Xiaodong Xu and Grant Aivazian
Dept. of Physics, Dept. of Materials Science and Engineering, University of Washington, Seattle, WA 98195, USA

Abstract. As silicon technologies face fundamental limits, breakthroughs in electronics and photonics are likely to take the form of new technologies that employ materials other than silicon. A promising material system is recently discovered 2D layered structures, such as graphene and group VI transition metal dichalcogenides (TMDCs). In this talk, I will first present our investigation of the optoelectronic response in dual-gated bilayer graphene with tunable electronic bandgap. We find that photocurrent generation is dominated by hot-carriers with a ~ps response time, which depends on the magnitude of the bandgap. In the second part of my talk, I will show that monolayer TMDCs are direct bandgap 2D semiconductors with full tunability of exciton species, ideal for exploring the excitonic optoelctronics in the 2D limit.

Xiaodong Xu has been an Assistant Professor in the Department of Physics and the Department of Material Science and Engineering at the University of Washington since Sept. 2010. He received his PhD (Physics, 2008) from the University of Michigan and then performed postdoctoral research (2009-2010) at the Center for Nanoscale Systems at Cornell University. Selected awards include DAPRA YFA, NSF Early Career Award, and DoE Early Career Award.

Recent Activities and Emerging Capabilities at the UW Microfabrication Facility (MFF)

Michael Khbeis
Associate Director, Microfabrication Facility, University of Washington, Seattle, WA 98195, USA

Abstract. The University of Washington took control of the Microfabrication Facility (MFF) in July 2011. Since then, there have been significant activities and developments in fabrication and characterization technologies including silicon photonics, magnetic materials, superconductivity as well as the fabrication activities of several EDS speakers. This talk will provide an introduction to MFF capabilities, highlights of recent developments, and a preview of on-going and upcoming development efforts.

Michael Khbeis is the associate director of the UW CoE Microfabrication Facility (MFF) and returned to UW in October 2011. He received both his M.S. (2007) and Ph.D. (2010) degrees in electrical engineering from the University of Maryland – College Park and his B.S. from the University of Washington in 2001. His graduate studies were focused on MEMS-based hybridized energy scavenging while simultaneously leading the Microelectonics Integration program for the Department of Defense, where he developed enabling technologies for 2.5D/3D integration and flexible electronic systems. Exemplar technological developments include novel low profile packaging, plasma activated covalent bonding, and high aspect ratio sub-micron through silicon vias for high density interconnect and thermal management that resulted in a patent award in 2007 and IP sale to Intellectual Ventures in 2011. In order to develop these capabilities, he managed, designed, and oversaw construction or renovation of 3 cleanroom laboratories and specified, acquired, installed, and commissioned over 40 major semiconductor fabrication and advanced packaging tools. As a technology mission leader, serving as Research and Engineering Division Chief (2009-2011) and Branch Chief (2005-2009), he was one of the youngest researchers to achieve executive grade in the Agency.

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