Abstract
In mobile phones, there are two kinds of important devices, billions of transistors and a battery. The transistor controls electron flow in a semiconductor to enable processing and storage of information, while the latter stores electrochemical energy for driving the former. In the latest decade, devices with combined concepts of transistors and batteries, electrochemical transistors, are receiving increasing interests, because they can offer new opportunities beyond conventional current switching functions of all solid transistors.
Surprises came from a simple replacement of solid gate dielectrics in field effect transistors (FETs) with electrolytes, which allow scientists to form two dimensional (2D) electron systems at the transistor channel with the density of 1014 cm-2, which is 1 – 2 orders of magnitude larger than that achieved in conventional FETs. This type of electrochemical transistor was named as electric double layer transistor (EDLT). Taking the advantage of ultrahigh density 2D electron systems, the speaker and his research group have successfully realized electric field induced superconductivity, ferromagnetism, Mott-Hubbard transition, which have been impossible or at least extremely difficult in conventional all solid FETs.
In particular, the 2D crystals from transition metal dichaocogenides and other layered materials offers an ideal platform for the EDLT device, due to their dangling bond free surface structures. In fact, the research group has demonstrated electric field induced superconductivity and chiral light source based on EDLTs of 2D crystals. EDLT is creating an innovative concept of field effect phase control in a variety of materials. In this lecture, the speaker will review the current status of “Emergent Iontronics”, electronics based on ionic functions.
About the speaker
Prof Yoshihiro Iwasa received his PhD in Applied Physics from the University of Tokyo in 1986. He was research associate there from 1986 to 1991, and lecturer from 1991 to 1994. He had also been faculty at the Japan Advanced Institute of Science and Technology and Tohoku University. He returned to the University of Tokyo in 2010, and is currently Professor of Applied Physics and Quantum-Phase Electronics Center. He is also team leader at the RIKEN Center for Emergent Matter Science.
Prof Iwasa's research focuses on making revolutionary contribution to the low energy consumption electronics through creating novel quantum properties and functions based on devices made by heterointerfaces between inorganic and organic materials. The former includes semiconductors, metals, oxides, and chalcogenides, while the latter includes ionic liquids, self-assembled monolayers, and conjugated polymers. In particular, he and his research group focus on filed effect phase control such as electric field induced superconductivity, Mott transistor, electric field manipulation of spin current, and novel thermoelectric materials.
Prof Iwasa received numerous awards including the Commendations for Science and Technology from the Japan Minister of Education, Culture, Sports, Science and Technology, Superconductivity Science and Technology Award, Yazaki Science Prize, Japan IBM Science Award, Daiwa Adrian Prize, Materials Science Research Award, etc.
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