Sandia Labs FY22 Laboratory Directed Research & Development Annual Report

FY22 ANNUAL REPORT

PROTON-TUNABLE ANALOG TRANSISTOR FOR LOW-POWER COMPUTING. Motivated by the need for efficient analog signal processing, this Sandia LDRD team discovered that mixed valence coordination compounds called Prussian Blue Analogue (PBA) can be used for inkjet-printed flexible artificial synapses that reversibly switch conductance by more than four orders of magnitude based on electrochemically tunable oxidation state. Retention of programmed states is improved by nearly two orders of magnitude compared to the extensively studied between N-coordinated Ru sites controls the carrier concentration and mobility. This work was published in a recent article “Tunable Intervalence Charge Transfer in Ruthenium Prussian Blue Analog Enables Stable and Efficient Biocompatible Artificial Synapses” in the Journal of Advanced Materials , as well as five other articles. The Sandia team worked with the Arizona State University and the Sandia National/Regional partner Stanford

University. PI A. Alec Talin was recently invited to join the Science Magazine Board of Reviewing Editors. (PI: A. Alec Talin)

organic polymers, which enable in-memory compute and avoid energy costly off-chip access during training. They demonstrated dopamine detection using PBA synapses and

biocompatibility with living neurons, evoking prospective application for brain-computer interfacing. Application of electron transfer theory to in-situ spectroscopic probing of intervalence charge transfer elucidates a switching mechanism. When this occurs, the degree of mixed valency

In-situ spectroscopy reveals a new charge transport mechanism and how to control it.

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