Evaluating charge-type of polyelectrolyte as dielectric layer in memristor and synapse emulation

Abstract

Based on credible advantages, organic materials have received more and more attention in memristor and synapse emulation. In particular, an implementation of the ionic pathway as a dielectric layer is...

Organic iontronic memristors for artificial synapses and bionic neuromorphic computing

“…In addition, owing to the high diffusion velocity and low response time of the ion-active medium, OIM-based memristors hold immense potential for diverse applications encompassing artificial intelligence, neuromorphic computing, memory devices, and energy storage. 32 Generally, OIMs can be divided into two categories, namely, ionically rigid conjugated materials (IICs) and ionically flexible spacer materials (IIFs). 74 IICs pertain to organic compounds featuring rigid conjugated molecular frameworks and cationic or anionic groups.…”

“…81,82,91,93,123,124 In the context of memristive devices, the resistive states can be modulated by the migration of ions in and out of the active layer under an externally applied electric field. 32,125 The potential of these devices in low-cost and flexible electronics, as well as their ability to exhibit analog behavior, has garnered significant attention (Table 1). Therefore, developing high-performance OIMs is crucial to advancing the field of organic iontronic memristors and realizing their potential in a range of electronic applications.…”

“…In addition, owing to the high diffusion velocity and low response time of the ion-active medium, OIM-based memristors hold immense potential for diverse applications encompassing artificial intelligence, neuromorphic computing, memory devices, and energy storage. 32…”

“…24,25 Therefore, ion-doped organic materials and their iontronic devices have been further applied to various areas, such as light-emitting devices (LEDs), field-effect transistors (FETs), sensors, and especially memristors and neuromorphic computing. [26][27][28][29][30][31][32] Accordingly, organic ionic memristive materials (OIMs) and memristive devices have emerged as new electronics relying on ion migration and electron permeation in the solid ion transport layer. [33][34][35][36] OIMs hold great promise in artificial intelligence (AI), neuromorphic computing, brain-computer interfaces, etc.…”

A Diffusive Artificial Synapse Based on Charged Metal Nanoparticles

“…In these volatile memristors, the device with diffusive kinetics has attracted special interest due to its similarity to Ca 2+ dynamics within the biological synapse. − For example, to minimize the interfacial energy, the metal nanoparticle (e.g., Ag and Cu) conducting filaments could diffuse and regroup spontaneously to switch the device back to the high-resistance state upon removal of the bias. ,, However, most of the reported diffusive memristors are of the digital type. Although these digital devices have demonstrated exceptional reliability as selectors, nociceptors, hardware security, etc., it is difficult to faithfully replicate the nature of synaptic plasticity as its analogue. , Several analogue diffusive memristors have been developed in which the field-induced migration of mobile ions could gradually modulate the electron conductivity of the materials. − It returns to the original conductance when these mobile ions diffuse back under zero bias. Notably, the materials for the analogue diffusive memristors rely mainly on mixed ionic–electronic semiconductors (e.g., hybrid perovskites and ionic conducting polymers) − and “pure” ion-conductive films (e.g., Nafion) .…”