Prof. Rupp: "Memristive Oxide Devices for Neuromorphic Computing, Chemical Sensing and Chip-Integrated Batteries"
Tuesday, November 20, 2018 at 11:45am to 1:00pm
3-370
Applied Physics @ MIT presents a lecture
Prof. Jennifer Rupp, Thomas Lord Assistant Professor of Materials Science and Engineering, MIT
Memristive Oxide Devices for Neuromorphic Computing, Chemical Sensing and Chip-Integrated Batteries
The next generation of information memories and neuromorphic computing relies on studying the structure and transport properties of materials supporting ionic defects. Here, we introduce the idea to use ionic carriers in memristors to stare data for Resistive RAM and for neuromorphic computing beyond classical transistors. We will discuss basic theory and model experiments for solid state oxides, using the concepts of impedance and memristance, electro-chemo-mechanics and lattice strain modulation to tune the properties of ionic conducting oxide films and the resulting resistive switching-based devices. Manipulating charge carrier transfer and defect chemistry is a central aspect of oxide film material design because it directly impacts the resistive switching properties and future computer performance. To this end, we present a careful study of the influence of microstructure and defect states on the materials' diffusion characteristics. This study uses in-situ spectroscopic and microscopic techniques coupled with electrochemical micro-measurements to probe the relationship between near order structural bond strength and ionic, protonic and electronic diffusion kinetics in novel oxide heterostructure building blocks as part of optimized device architectures and computational schemes. In addition, we will introduce some new perspectives in the field by demonstrating strained memristors to tune performance beyond extrinsic doping, or even using lithium as a moving cation in memristive switches which introduces intriguing parellels with the classic solid-state Li conductors employed in batteries. Finally, we will discuss the ideas of functionalizing such devices to add chemical sensing functionality, as well as adapting them to act as chip-integrated batteries.
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