Event

Dr. Susan Fullerton 

PITT

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 smart phones 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 (e.g., solid polymer electrolytes and ionic liquids). 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.  For example, we have developed a “monolayer electrolyte” that is a single molecule thick and is designed for bistability.  We have custom-synthesized a single-ion conductor and used it as an electric double layer (EDL) gate on 2D FETs to control strain via field-effect. Together with our collaborators we have develop several new types of “locking” electrolytes that can lock and unlock EDLs via multiple external triggers.  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. In this talk I will review the basics of EDL gating and highlight our most recent developments on ion conductors with an eye towards application. 

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 Marion Milligan Mason award for women in the chemical sciences from AAAS, 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/

RESEARCH

The vision of the Nanoionics and Electronics Lab is to translate the use of ions as a tool for exploring transport in new materials to an active device component that makes possible new electronic and photonic devices with functionalities that cannot be achieved using conventional materials.

Current research interest include nanoionic 2D memory (NSF-ECCS/GOALI, NSF-DMR-EPM/CAREER, AAAS), electrostatic double layer (EDL) gating of 2D crystals for low-power electronics (LEAST center, SRC/DARPA), exploring the strain-induced semiconductor to metal transition in MoTe2 (NSF-DMR) and polymer electrolytes for reconfigurable plasmonic and photonic elements (DARPA A2P).

HOST: FAKHRAAI