The ISPSA 2018 is honored to have plenary speakers from around the world presenting. Their insights will bring depth and substance to the relationship semiconductors, Nano-bio devices, green energy technologies fields.
Prof. Jin Jang
Kyung Hee University, Korea
Presentation Title: Displays Based on Light-Emitting Diodes
Jin Jang is a Professor at Department of Information Display of Kyung Hee University. His current research programs are in oxide and LTPS TFTs for displays, TFT circuits and TFT application to sensors, QLED and flexible AMOLED. He is the author or co-author of over 900 technical publications of which over 580 are in SCI Journals such as Nature, Advanced Materials, Advanced Functional Materials, Advanced Energy Materials, Energy Environmental Science, APL, IEEE TED and IEEE EDL. He is currently a Director of Advanced Display Research Center (ADRC), and had served as Program Chair of SID Symposium 2007 and General Chair of SID Display Week in 2009 and General Chair of IMID 2012, 2013. He is a Fellow of SID and he was awarded George Smith Award from IEEE in 2012 and Slotto Owaki Prize from SID in 2015.
Recently, OLED displays are getting more popular for mobile and TV applications. OLED displays on plastic substrates are used for smartphone displays such as Galaxy and Apple iPhone and the OLED based on oxide TFT backplanes are used for high end TVs. Recently, u-LED, QD-LED and perovskite LEDs are intensively studied for the next generation displays. I will review the current state-of-art technologies for the plastic OLED, OLED TV, and LEDs based on QD and perovskite semiconductors.
Prof. James Hone
Columbia University, USA
Presentation Title: Van der Waals heterostructures: techniques, properties, and materials
James Hone is currently Wang Fong-Jen Professor of Mechanical Engineering at Columbia University, and director of PAS3, Columbia’s Materials Science Research and Engineering Center (MRSEC). He received his BS in physics from Yale in 1990, and PhD in experimental condensed matter physics from UC Berkeley in 1998, and did postdoctoral work at the University of Pennsylvania and Caltech, where he was a Millikan Fellow. He joined the Columbia faculty in 2003. His current research interests include synthesis, characterization, manipulation, and applications graphene, and other 2D materials; nanomechanical devices; and nano-biology.
Artificial van der Waals heterostructures of two-dimensional materials offer the possibility of creating layered structures with a wide variety of starting materials and control of composition at the single atomic layer limit. To create such structures, developed a van der Waals transfer technique which largely eliminates interfacial contamination. We have used this technique to encapsulate 2D materials within crystalline h-BN with nearly perfect interfaces, which allows for near-intrinsic behavior in materials such as graphene, transition metal dichalcogenides semiconductors, and 2D superconductors. However, significant challenges toward functional heterostructures remain. This talk will detail our recent progress in the materials engineering for van der Waals heterostructures, including control over disorder, achieving robust electrical contacts, controlling interlayer rotation angle, and improving the quality of the constituent materials.
Prof. Takao Someya
The University of Tokyo, Japan
Presentation Title: Continuous health-monitoring with skin sensors
Takao Someya received the Ph.D. degree in electrical engineering from the University of Tokyo in 1997. Since 2009, he has been a professor of Department of Electrical and Electronic Engineering, The University of Tokyo. From 2001 to 2003, he worked at the Nanocenter (NSEC) of Columbia University and Bell Labs, Lucent Technologies as a Visiting Scholar. He has been Globalfoundries Visiting Professor, National University of Singapore since 2016. His current research interests include organic transistors, flexible electronics, plastic integrated circuits, large-area sensors, and plastic actuators. Prof. Someya has received a number of awards, a Japan Society for the Promotion of Science (JSPS) Prize in 2009, 2004 IEEE/ISSCC Sugano Award. Prof. Someya’s “large-area sensor array” electronic thin film was featured in Time Magazine as one of its “Best Inventions of 2005” in its November 21st, 2005 issue.
We have developed thin stretchable displays that fit snugly on the skins, which show the moving waveform of an electrocardiogram recorded by a breathable, on-skin electrode sensor. The integrated system combines a flexible, deformable display with a lightweight sensor composed of a breathable nanomesh electrode and wireless communication module. The skin display consists of a 16 x 24 array of micro LEDs and stretchable wiring mounted on a rubber sheet. Our skin display exhibits simple graphics with motion. Bbecause it is made from thin and soft materials, it can be deformed freely. The display is stretchable by as much as 45 percent of its original length.
Prof. James J. Coleman
The University of Texas at Dallas, USA
Presentation Title: Periodic Resonant 3D-Confined Semiconductor Quantum Structures
James J. Coleman received degrees in electrical engineering from the University of Illinois, Urbana. After working at Bell Laboratories, Murray Hill, NJ, and Rockwell International, Anaheim, CA, he returned to the University of Illinois as professor of Electrical and Computer Engineering where he held the Intel Alumni Endowed Chair. He and his students made contributions to the design, performance, and reliability of 980 nm strained-layer InGaAs lasers. They were also involved in developing high performance narrow diode lasers and other photonic devices by selective-area epitaxy, and the growth processes for quantum confined laser structures. In 2013, he joined the University of Texas at Dallas.
Professor Coleman has published more than 600 journal publications and conference presentations and 13 book chapters. He has 10 US patents and has given more than 100 invited presentations. He was president of the IEEE Photonics Society in 2010 and 2011. Professor Coleman has won the John Tyndall Award of the IEEE Photonics Society and Optical Society of America, the SPIE Technical Achievement Award, the IEEE David Sarnoff Award, the OSA Nick Holonyak, Jr. Award, the ISCS Heinrich Welker Award, and the IEEE Photonics Society William Streifer Scientific Achievement Award. He is a member of the US National Academy of Engineering and a Fellow of the IEEE, OSA, SPIE, the American Physical Society, the American Association for the Advancement of Science, and the National Academy of Inventors.
Quantum dots produced in a variety of ways have introduced a larger design space for semiconductor devices. Previous work on inverted quantum dot structures has shown that the crystal-like periodicity introduces potentially useful changes in the energy band structure including sharp, high-density states above the ground state. We describe the processes for obtaining these structures and the novel features introduced into their optical and electronic properties.
Prof. Zhong Lin Wang
Georgia Institute of Technology, USA
Presentation Title: Piezotronics and Piezo-phototronics of 3rd Generation
Dr. Zhong Lin (ZL) Wang is the Founding Director and Chief Scientist at Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences，and Hightower Chair in Materials Science and Engineering and Regents' Professor at Georgia Tech. Dr. Wang has made original and innovative contributions to the synthesis, discovery, characterization and understanding of fundamental physical properties of oxide nanobelts and nanowires, as well as applications of nanowires in energy sciences, electronics, optoelectronics and biological science. His discovery and breakthroughs in developing nanogenerators establish the principle and technological road map for harvesting mechanical energy from environment and biological systems for powering a personal electronics. His research on self-powered nanosystems has inspired the worldwide effort in academia and industry for studying energy for micro-nano-systems. He coined and pioneered the field of piezotronics and piezo-phototronics. More >
Piezoelectricity, a phenomenon known for centuries, is an effect that is about the production of electrical potential in a substance as the pressure on it changes. For wurtzite structures such as ZnO, GaN, InN and ZnS, due to the polarization of ions in a crystal that has non-central symmetry, a piezoelectric potential (piezopotential) is created in the crystal by applying a stress owing to the presence of one atomic-layer thick polarization charges at the surface/interface. The effect of piezopotential on the transport behavior of charge carriers is significant in II-VI and III-V compound semiconductors due to their multiple functionalities of piezoelectricity, semiconductor and photon excitation. By utilizing the advantages offered by these properties, a few new fields have been created. Electronics fabricated by using inner-crystal piezopotential as a “gate” voltage to tune/control the charge transport behavior is named piezotronics, with applications in strain/force/pressure triggered/controlled electronic devices, sensors and logic units. Piezo-phototronic effect is a result of three-way coupling among piezoelectricity, photonic excitation and semiconductor transport, which allows tuning and controlling of electro-optical processes by strain induced piezopotential. Lastly, photon emission due to piezoelectric potential is also introduced as a new field of piezophotonics. The objective of this talk is to introduce the fundamentals of piezotronics and piezo-phototronics and to give an updated progress about their applications in human-machine interfacing, optoelectronics, sensors and chemistry (LED, solar cell, photon detectors, photon catalysis). Finally, these effects were also extended to 2D materials such as MoS2.
Prof. Nam-Gyu Park
Sungkyunkwan University, Korea
Presentation Title: Organic-Inorganic Hybrid Perovskite Materials and Applications
Nam-Gyu Park is professor and SKKU-Fellow at School of Chemical Engineering, Sungkyunkwan University. He received his B.S., M.S. and Ph.D. from Seoul National University in 1988, 1992 and 1995, respectively. He worked at ICMCB-CNRS, France, from 1996 to 1997 and at National Renewable Energy Laboratory, USA, from 1997 to 1999 as postdoctoral researchers. He worked as Director of Solar Cell Research Center at Korea Institute of Science and Technology (KIST) from 2005 to 2009 and as a principal scientist at Electronics and Telecommunications Research Institute (ETRI) from 2000 to 2005 before joining Sungkyunkwan University as a full professor in 2009. He has been doing researches on high efficiency mesoscopic nanostructured solar cells since 1997. He is pioneer of solid state perovskite solar cell, which was first developed in 2012. He was selected as a New Class of Nobel Prize-Worthy Scientists in September 20, 2017 and he was included in 3,300 highly cited researchers (top 1% scientists) in November 15, 2017 by Clarivate Analytics. He received awards, including Scientist Award of the Month (MEST, Korea), KyungHyang Electricity and Energy Award (KEPCO, Korea), KIST Award of the Year (KIST, Korea), Dupont Science and Technology Award (Dupont Korea), SKKU fellowship, MRS Outstanding Research Award (MRS, Boston), WCPEC Paper Award (Kyoto, Japan), Hamakawa Award of PVSEC (Busan, Korea) and KAST Engineering Award (KAST, Korea). He is a fellow of Korean Academy of Science and Technology (KAST). He published over 240 peer-reviewed scientific papers, including Nature, Science, Nature Materials, Nature Nanotechnology, Nature Energy and Nature Communications, 80 patent applications, 1 book editor, 7 book chapters. He received H-index of 71 (Google Scholar, 64 from web of science) as of January, 2018. More >
Since the first report on solid-state perovskite solar cell with power conversion efficiency (PCE) of 9.7% in 2012 reported by our group, publications on perovskite solar cell increase exponentially. As a result, more than 9,000 peer-reviewed research papers were published since 2012. Technologically, PCE was improved in a very short period and reached over 22%, indicating that perovskite solar cell is disruptive technology in photovoltaics. Although high PCE is demonstrated, current-voltage hysteresis and stability are critical issues to be solved. In this talk, history of perovskite solar cell along with progress in SKKU will be presented. In order to solve issues, methodologies to eliminate hysteresis and/or improve stability will be discussed based on bulk, surface, and interface engineering. We developed a universal method to eliminate the hysteresis, where a severe hysteresis observed usually in normal structure with TiO2 electron transporting layer was completely removed by interstitial doping to MAPbI3, FAPbI3 and mixed cation/anion perovskites. Interface nano-engineering is also one of effective methods to improve stability and reduce hysteresis. Surface passivation and low-dimensional interlayer led to significant increase in stability along with substantial reduction in hysteresis. Recent development of low-dose X-ray imaging system employing MAPbI3 will be presented. Finally research direction toward Shockley-Queisser limit PCE is proposed.