Phi Beta Kappa Visiting Scholar Program

This event is postponed to a time TBD

Victor S. BatistaPicture of Victor Batista, for aesthetic purposes
Professor of Chemistry, Yale University
Senior Editor of The Journal of Physical Chemistry

Title From Molecular Diodes to Molecular Memristors for the Digital Technology

September 26, 2017, 11am Parsons N104


In the next generation of digital-technology, which includes forward-looking consumer electronics and the internet, non-volatile memory will play a decisive role with flash memory as the key player. However, as flash memory fails to meet the commercial demands of scalability and endurance the industry is looking for an alternative; resistive memory devices are a leading candidate. Organic resistive memories are of particular interest because of their low-cost solution-processability and synthetic tunability. However, to date they have been lacking reproducibility, endurance, retention, switching speed, and the mechanistic understanding required for
commercial translation. In this talk, we demonstrate a new concept for a resistive memory device with a spin-coated active layer of transition metal complex with unprecedented reproducibility (~350 devices), fast switching (≤30 ns), excellent endurance (~1012 cycles), and retention (>106 s). We establish a definitive switching mechanism via in-situ Raman and UV-Vis-spectroscopy alongside spectroelectrochemistry and show that the redox state of the ligands determines the switching states of the device while the counterions control the hysteresis. Both in terms of device performance and our understanding of the mechanism, the study presents a significant step forward in organic resistive memory technology. In addition, we discuss the design and development of molecular, as fundamental electrical circuit components that allow higher current to flow forward but not in reverse. Molecular diodes are thus likely to enable a wide range of new technological applications, from molecular electronic circuits and nanoscale memory devices to photoelectrochemical cells for multi-electron reactions at electrode surfaces. We will discuss the design of molecular rectifiers and the underlying mechanism responsible for rectification. Support comes from electron paramagnetic resonance, terahertz spectroscopic, and computational modeling characterizing the asymmetry of electron transfer properties, and conductance measurements based on the scanning tunneling microscope break-junction (STM-BJ) technique.



Victor Batista is professor of chemistry and has served as director of undergraduate studies at Yale, 2008-2010, and as senior editor of The Journal of Physical Chemistry since 2011. After receiving his B.Sc. degree in chemistry at the Universidad de Buenos Aires, he continued his studies at Boston University, UC Berkeley, and the University of Toronto. His research is concerned with the development of rigorous and practical methods for simulations of quantum processes in complex systems, and with applied studies of photochemical and electrochemical processes in: proteins, semiconductor materials, aerosols, and catalysts for the chemical conversion of carbon dioxide and water. His honors include the National Science Foundation’s Presidential Early Career Award for Scientists & Engineers, the Camille Dreyfus Teacher-Scholar Award, an Alfred P. Sloan fellowship, and co-chairmanship of the 2016 Vibrational Spectroscopy Gordon Research Conference.
Founded in 1776, the Phi Beta Kappa Society is the nation's most prestigious academic honor society. Its mission is to champion education in the liberal arts and sciences, to recognize academic excellence, and to foster freedom of thought and expression. 
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Lectures are open to the public.  For more information, contact the Department of Chemistry at 603-862-1550.