# Filtering Signal Processes in Molecular Multimedia Memristors

## TL;DR

This paper introduces a molecular-regulated memristor platform inspired by hemoglobin, enabling precise control of ionic migration for neuromorphic computing with versatile learning capabilities.

## Contribution

It presents a novel MEIS platform using metallophorphyrins to regulate ionic migration, demonstrating enhanced memristive behaviors and neuromorphic functionalities.

## Key findings

- Stable pinched hysteresis verified across device structures.
- Coordination-dependent device parameters support ionic migration control.
- Emulation of STM to LTM and activity-dependent learning processes.

## Abstract

To obtain precisely controllable, robust as well as reproduceable memristor for efficient neuromorphic computing still very challenging. Molecular tailoring aims at obtaining the much more flexibly tuning plasticity has recently generated significant interest as new paradigms toward the realization of novel memristor-based synapses. Herein, inspired by the deliberate oxygen transport carried by the hemoglobin in our blood circulation, we report a novel molecular-regulated electronic/ionic semiconducting (MEIS) platform ITO/MTPP/Al2O3-x/Al with a series of metallophorphyrins (MTPPs) to delicately regulate the ionic migration for robust molecular multimedia memristors. The stable pinched hysteresis resulted from the coordination-regulated ionic migration was verified by different device structures, operation modes, as well as the characterizations of scanning transmission electron microscopy with energy-dispersive X-ray spectroscopy (STEM-EDX) and X-ray photoelectron spectroscopy (XPS). Metal coordination-dependent device parameters such as potential and depression as well as retention curves further support the correlation between the coordination and stimulating flux-dependent memristive behaviors. In the 5,10,15,20-tetraphenyl-21H,23H-porphyrin zinc(II) (ZnTPP) synapse, we implement versatile emulations, mainly including transition from short-term memory (STM) to long-term-memory (LTM), learning experience and activity-dependent learning-memory process in integrated neuromorphic configurations based on the biological Hebbian rules, and develop the fresh Spike-Amplitude-Dependent-Plasticity (SADP) with the applications of signal filtering and habituation and sensitization which are beyond the prevalent Hebbian rules.

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Source: https://tomesphere.com/paper/1704.01526