[Paper Review] Electrochemically controlled polymeric device: a memristor (and more) found two years ago

Victor Erokhin, Marco Fontana|ArXiv.org|Jul 2, 2008

Advanced Memory and Neural Computing22 references43 citations

TL;DR

This paper presents a polymeric memristor fabricated via electrochemical control, demonstrating memory of its past electrical history. The device functions as a synaptic analog in bioinspired networks, enabling adaptive signal processing through resistive switching driven by ion migration in a polymer matrix, with key results showing stable, repeatable memristive behavior suitable for neuromorphic computing applications.

ABSTRACT

We report the fabrication and properties of a polymeric memristor, i.e. an electronic element with memory of its previous history. We show how this element can be viewed as a functional analog of a synaptic junction and how it can be used as a critical node in adaptive networks capable of bioinspired intelligent signal processing.

Motivation & Objective

• To develop a polymeric memristor that exhibits memory of its electrical history through electrochemical processes.
• To demonstrate the device's functionality as a synaptic analog in adaptive neural networks.
• To explore the potential of polymer-based resistive switching devices for neuromorphic computing and intelligent signal processing.
• To characterize the electrochemical and electronic properties of the device under varying voltage and current conditions.
• To validate the device's stability and reproducibility for use in bioinspired computing architectures.

Proposed method

• The device is fabricated using a polymer electrolyte layer sandwiched between two electrodes, enabling ion migration under applied voltage.
• Electrochemical control is achieved by applying voltage pulses that induce redox reactions and ion transport, altering the device's resistance.
• The resistance state is measured as a function of applied voltage and current, demonstrating memristive behavior.
• The system is modeled as a functional analog of a biological synapse, with resistance changes mimicking synaptic plasticity.
• The device operates through reversible formation and rupture of conductive filaments via ion migration in the polymer matrix.
• Experimental characterization includes I-V measurements to confirm memristive hysteresis and memory retention.

Experimental results

Research questions

• RQ1 Can a polymeric device exhibit memristive behavior through electrochemically controlled ion migration?
• RQ2 How does the device's resistance depend on its history of applied voltage and current?
• RQ3 To what extent can the device emulate synaptic plasticity in biological neural systems?
• RQ4 What are the stability and reproducibility characteristics of the electrochemically controlled resistive switching?
• RQ5 Can this device serve as a critical component in adaptive, bioinspired signal processing networks?

Key findings

• The fabricated polymeric device exhibits clear memristive behavior, with a hysteretic I-V curve indicating memory of past electrical states.
• The resistance of the device is controllable via voltage pulses, demonstrating reversible switching between high- and low-resistance states.
• The device's operation is driven by electrochemical processes involving ion migration in the polymer, confirmed by the observed hysteresis and memory effects.
• The device functions as a functional analog of a biological synapse, with resistance changes mimicking synaptic weight modulation.
• The system shows stable and repeatable switching behavior, suitable for integration into adaptive neural networks.
• The results support the feasibility of using electrochemically controlled polymer devices for neuromorphic computing applications.