The interplay between ions and electrons governs processes as common as the biochemistry essential for life and the performance of devices as ubiquitous as batteries. The energy that powers our smartphones and laptops is stored by ions. Yet when we peer past the battery and examine the device-scale electronics, mobile ions are nowhere to be found. This is a missed opportunity because the coupling between ions in electrolytes and electrons/holes in novel semiconductors is strong. For example, in two-dimensional (2D) materials this coupling has uncovered exciting phenomena such as spin polarization, photogalvanic current, current-induced circularly polarized electroluminescence, and superconductivity.
Remarkably, these demonstrations have relied on electrolytes that were not designed for investigating semiconductor physics, but instead for energy storage. Our group is reimagining how ions can be used in electronics when the electrolyte is custom designed to provide a specific functionality or unlock a new mechanism to control transport. In this talk, I will describe a bistable “monolayer electrolyte” that is a single molecule thick and designed for non-volatile memory. I will also present a single-ion conductor that can strain the channel of a 2D FET and convert the material from semiconducting to metallic. Our development of these and other new ion-conductors is grounded in fundamental materials science and driven by applications in the electronics community including non-volatile memory, low-power logic, hardware security, and neuromorphic computing.
Biography
Susan Fullerton is an Associate Professor, Bicentennial Board of Visitors Faculty Fellow, and Vice Chair for Graduate Education in the Department of Chemical and Petroleum Engineering at the University of Pittsburgh. She earned her Ph.D. in Chemical Engineering at Penn State in 2009 and joined the Department of Electrical Engineering at the University of Notre Dame as a Research Assistant Professor. In 2015 she established the Nanoionics and Electronics Lab at Pitt as an Assistant Professor and was promoted to Associate Professor with tenure in 2020. Fullerton’s work has been recognized by an NSF CAREER award, an Alfred P. Sloan Fellowship, a AAAS Marion Milligan Mason award for women in the chemical sciences, and a Ralph E. Powe Jr. Faculty Award from ORAU. For her teaching, Fullerton was awarded the 2018 James Pommersheim Award for Excellence in Teaching in Chemical Engineering at Pitt. For more information: http://fullertonlab.pitt.edu/